Cherry-red plasma: Beyond the assumption of hemolysis.

Hemolysis is the most prevalent pre-analytical interfering factor and a major source of error in laboratory analysis. The examination of samples post-centrifugation can provide valuable information regarding pre-analytical interferences. In this unusual case, a patient's plasma specimen was cherry-red after centrifugation, which is most usually indicative of hemolysis. However, subsequent investigations ruled out common hemolysis causes. We eventually determined that the patient's cherry-red plasma was most likely caused by other factors in the patient's medical history, including cancer treatment with PV-10 (rose bengal disodium 10%). We then conducted an interference study to comprehensively assess the effects of PV-10 on various biochemical tests, especially liver function tests and bilirubin levels. The findings indicate that PV-10 has varying effects on different biochemical assays and test results should be examined individually. This report underlines the need for awareness of potential drug interference on laboratory tests for better result interpretation and making clinical decisions.

The plasma EBV DNA load with IL-6 and VEGF levels as predictive and prognostic biomarker in nasopharyngeal carcinoma.

Nasopharyngeal carcinoma (NPC) is often diagnosed at a very advanced stage due to its location and non-specific initial symptoms. Moreover, no clinically useful serological marker has been established so far for early detection of NPC. In this study, we have investigated the clinical significance of plasma Epstein-Barr virus DNA load along with interleukin-6 (IL-6) and vascular endothelial growth factor (VEGF) levels to evaluate if these three all together can be useful as a strong serological marker for early detection and prediction of treatment response in patients with NPC. Plasma EBV DNA load, IL-6 level, VEGF expressions were measured in 24 patients with NPC at presentation and various time points during and after treatment. There was a positive correlation between high plasma EBV DNA load with higher IL-6 and VEGF expression, which was closely associated with therapeutic response as well. Persistent or recurrent plasma EBV load with higher IL-6 and VEGF levels can potentially predict disease progression and may be useful to select patients for additional therapy and longer follow-up.

[Effect of fluid resuscitation with crystalloid combined with plasma on the prognosis of septic patients with hypoalbuminemia].

OBJECTIVE: To evaluate the difference in efficacy of two fluid resuscitation regimens, crystalloid alone versus crystalloid combined with plasma infusion, on the prognosis of septic patients with hypoalbuminemia. METHODS: A retrospective study was conducted. Septic patients with hypoalbuminemia admitted to the department of critical care medicine of Dongtai People's Hospital from January 2017 to December 2022 were selected as study subjects. Patients were divided into single group (crystalloid alone) and combined group (crystalloid combined with plasma) according to the fluid resuscitation regimen at the time of admission. General information, as well as coagulation indices before resuscitation (on day 1) and day 3 of resuscitation were collected. The primary study endpoint was 28-day mortality. The single and combined groups were stratified according to albumin level at resuscitation (< 25 g/L, 25-30 g/L, and > 30 g/L) to compare the differences in 28-day mortality among patients with different albumin levels. Kaplan-Meier survival curves of patients' 28-day prognosis were plotted. RESULTS: A total of 164 septic patients with hypoalbuminemia were included, including 60 patients in the single group and 104 patients in the combined group. (1) There were no significantly differences in age, gender, acute physiology and chronic health evaluation II (APACHE II), sequential organ failure assessment (SOFA), as well as pre-resuscitation platelet count (PLT), prothrombin time (PT), activated partial thromboplastin time (APTT), D-dimer, antithrombin- III (AT- III), international normalized ratio (INR), fibrin degradation product (FDP), serum lactic acid (Lac), and albumin level between the two groups, indicating comparability. (2) The levels of PT and AT- III in the combined group improved significantly on day 3 compared to before resuscitation, and the level of AT- III in the combined group improved more significantly on day 3 compared to the single group [(79.80±17.95)% vs. (66.67±18.69)%, P < 0.01]. Lac and albumin levels improved significantly after resuscitation in both the single and combined groups, but there were no significantly differences in the degree of improvement between the two groups. (3) There was no significantly difference in the 28-day mortality between the single group and the combined group [55.0% (33/60) vs. 42.3% (44/104), P > 0.05]. The 28-day mortality of patients with albumin < 25 g/L was significantly higher than that with albumin 25-30 g/L and > 30 g/L [63.1% (41/65) vs. 36.2% (25/69), 36.7% (11/30), both P < 0.05]. (4) Kaplan-Meier survival curve analysis showed that there was no significantly difference in 28-day cumulative survival rate between the single group and the combined group (Log-Rank: χ 2 = 2.067,P = 0.151). The median survival rate of albumin was 27.1 g/L [95% confidence interval (95%CI) was 24.203-29.997] in the single group and 28.7 g/L (95%CI was 26.065-31.335) in the combined group. CONCLUSIONS: Fluid resuscitation with crystalloid combined with plasma improves exogenous coagulation dysfunction in septic patients with hypoalbuminemia, but does not improve 28-day mortality outcome. The higher the initial albumin level in septic patients, the lower the mortality.

Toward a Sociology of Plasma Products.

Over the past 20 years, plasma has become a medical treatment characterized as "liquid gold" to signal its lifesaving potential. Through a manufacturing process termed fractionation, plasma, collected through blood donation, is turned into Plasma Derived Medical Products (PDMPs). The World Health Organization (WHO) has underlined the importance of PDMPs for global health care, including a number of PDMPs on the WHO Model List of Essential Medicines. The process of collecting plasma from a donor, manufacturing plasma derived treatments, and distributing those treatments globally requires the coordination of multiple social actors operating in different social, political and economic contexts, but has received little attention in scholarly literature on public policy or the social sciences. This paper will introduce a set of analytic questions and concepts that can direct a sociology of plasma products. We build on the behavioral turn in the policy sciences to identify relevant policy questions emerging from this field and offer the analytic tools necessary to investigate how different social actors in this space make meaning of plasma. To do this, we will draw on key concepts in the sociology of health and illness.

A microfluidic chip with integrated plasma separation for sample-to-answer detection of multiple chronic disease biomarkers in whole blood.

Point-of-care testing of multiple chronic disease biomarkers is crucial for timely intervention and management of chronic diseases. Here, a "sample-to-answer" microfluidic chip was developed for simultaneous detection of multiple chronic disease biomarkers in whole blood by integrating a plasma separation module. The whole detection process is very convenient, i.e., just add whole blood and get the results. The chip successfully achieved the simultaneous detection of total cholesterol, triglycerides, uric acid, and glucose in undiluted whole blood within 21 min, including 6 min for plasma separation and 15 min for enzymatic chromogenic reactions. Moreover, the sensitivity levels of on-chip detection of chronic disease biomarkers can also meet clinically relevant thresholds. The chip is easy to use and has significant potential to improve home self-management of chronic diseases and enhance healthcare outcomes.

Humidity-enhanced microfluidic plasma separation on Chinese Xuan-papers.

The first step in blood testing necessitates blood separation to obtain an adequate volume of plasma. Traditional centrifugation is bulky, expensive and electricity-powered, which is not suitable for micro-scale blood plasma separation in point-of-care testing (POCT) cases. Microfluidic paper-based plasma separation devices present a promising alternative for plasma separation in such occasions. However, they are limited in terms of plasma yield, which hinders analyte detection. Herein, we proposed a humidity-enhanced paper-based microfluidic plasma separation method to address this issue. Specifically, paper was first treated by blood-typing antibodies, then samples of whole blood were introduced into the prepared paper. After waiting for 5 min for RBC agglutination and plasma wicking under high humidity, micro-scale plasma separation from whole blood was achieved. As a result, an extremely high plasma yield of up to 60.1% could be separated from whole blood through using Xuan-paper. Meanwhile, the purity of plasma could reach 99.99%. Finally, this innovative approach was effortlessly integrated into distance-based glucose concentration detection, enabling rapid determination of blood glucose levels through naked-eye observation. Considering the simplicity and inexpensiveness of this method, we believe that this technology could be integrated to more paper-based microfluidic analytical devices for rapid and accurate detection of plasma analytes in POCT.

Diagnostic potential of blood plasma longitudinal viscosity measured using Brillouin light scattering.

Blood plasma viscosity (PV) is an established biomarker for numerous diseases. Measurement of the shear PV using conventional rheological techniques is, however, time consuming and requires significant plasma volumes. Here, we show that Brillouin light scattering (BLS) and angle-resolved spectroscopy measurements of the longitudinal PV from microliter-sized plasma volumes can serve as a proxy for the shear PV measured using conventional viscometers. This is not trivial given the distinct frequency regime probed and the longitudinal viscosity, a combination of the shear and bulk viscosity, representing a unique material property on account of the latter. We demonstrate this for plasma from healthy persons and patients suffering from different severities of COVID-19 (CoV), which has been associated with an increased shear PV. We further show that the additional information contained in the BLS-measured effective longitudinal PV and its temperature scaling can provide unique insight into the chemical constituents and physical properties of plasma that can be of diagnostic value. In particular, we find that changes in the effective longitudinal viscosity are consistent with an increased suspension concentration in CoV patient samples at elevated temperatures that is correlated with disease severity and progression. This is supported by results from rapid BLS spatial-mapping, angle-resolved BLS measurements, changes in the elastic scattering, and anomalies in the temperature scaling of the shear viscosity. Finally, we introduce a compact BLS probe to rapidly perform measurements in plastic transport tubes. Our results open a broad avenue for PV diagnostics based on the high-frequency effective longitudinal PV and show that BLS can provide a means for its implementation.

[Study on the Experimental Methodology of Plasma Clot Retraction].

OBJECTIVE: To explore the key factors affecting plasma clot retraction and optimize the experimental method of plasma clot retraction, in order to study the regulation of platelet function and evaluate the modulatory effects of drugs on plasma clot retraction. METHODS: The effects of different concentrations of thrombin, Ca2 + and platelets on plasma clot retraction were studied, and the detection system of plasma clot retraction was optimized. The availability of the detection system was then validated by analyzing the regulatory effects of multiple signaling pathway inhibitors on plasma clot retraction. RESULTS: Through the optimization study of multiple factors, platelet rich plasma (PRP) containing 0.5 mmol/L Ca2 + and 40×109/L platelets was treated with 0.2 U/ml thrombin to perform plasma clot retraction analysis. After treatment with thrombin for 15 min, plasma clot retracted significantly. After treatment with thrombin for 30 min, the percentage of plasma clot retraction was more than 50%. The regulatory effects of multiple signaling pathway inhibitors on plasma clot retraction were studied in this detection system. PKC inhibitor Go 6983 exhibited a significant inhibitory effect on plasma clot retraction, while PI3K inhibitor Ly294002 and p38 MAPK inhibitor SB203580 slightly suppressed plasma clot retraction. CONCLUSION: PRP containing 0.5 mmol/L Ca2 + and 40×109/L platelets can be induced with 0.2 U/ml thrombin to conduct plasma clot retraction analysis, which can be used to study the regulation of platelet function and evaluate the modulatory effects of drugs on plasma clot retraction.

Protocol for a phase 3, randomised, active-control study of four-factor prothrombin complex concentrate versus frozen plasma in bleeding adult cardiac surgery patients requiring coagulation factor replacement: the LEX-211 (FARES-II) trial.

INTRODUCTION: Reduced thrombin generation is an important component of post cardiopulmonary bypass (CPB) coagulopathy. To replenish coagulation factors and enhance thrombin generation in bleeding surgical patients, frozen plasma (FP) and four-factor prothrombin complex concentrate (4F-PCC) are used. However, the efficacy-safety balance of 4F-PCC relative to FP in cardiac surgery is unconfirmed. METHODS AND ANALYSIS: LEX-211 (FARES-II) is an active-control, randomised, phase 3 study comparing two coagulation factor replacement therapies in bleeding adult cardiac surgical patients at 12 hospitals in Canada and the USA. The primary objective is to determine whether 4F-PCC (Octaplex/Balfaxar, Octapharma) is clinically non-inferior to FP for haemostatic effectiveness. Inclusion criteria are any index (elective or non-elective) cardiac surgery employing CPB and coagulation factor replacement with 4F-PCC or FP ordered in the operating room for bleeding management. Patients will be randomised to receive 1500 or 2000 international units of 4F-PCC or 3 or 4 units of FP, depending on body weight. The primary endpoint of haemostatic treatment response is 'effective' if no additional haemostatic intervention is required from 60 min to 24 hours after the first initiation of 4F-PCC or FP; or 'ineffective' if any other haemostatic intervention (including a second dose of study drug) is required. An estimated 410 evaluable patients will be required to demonstrate non-inferiority (one-sided α of 0.025, power ≥90%, non-inferiority margin 0.10). Secondary outcomes include transfusions, bleeding-related clinical endpoints, coagulation parameters and safety. ETHICS AND DISSEMINATION: The trial has been approved by the institutional review boards of all participating centres. Trial completion is anticipated at the end of 2024, and results will be disseminated via publications in peer-reviewed journals and conference presentations in 2025. The results will advance our understanding of coagulation management in bleeding surgical patients, potentially reducing the need for allogeneic blood products and improving outcomes in surgical patients. TRIAL REGISTRATION NUMBER: NCT05523297.

Rhinovirus characteristics associated with viremia in childhood asthma.

Although rhinoviruses play a major role in exacerbations of childhood asthma, the presence of rhinovirus (RV) RNA in plasma, referred to as viremia, has been investigated in a few studies. The aim of the study was to investigate the presence of rhinovirus viremia at the time of asthma exacerbation and to describe the molecular characteristics of rhinoviruses associated with viremia. We conducted an observational, prospective, multicenter study in eight pediatric hospitals (VIRASTHMA2). Preschool-aged recurrent wheezers (1-5 years) hospitalized for a severe exacerbation were included. Reverse-transcription polymerase chain reaction (RT-PCR) and molecular typing for RV/enteroviruses (EV) were performed on nasal swabs and plasma. Plasma specimens were available for 105 children with positive RT-PCR for RV/EV in respiratory specimens. Thirty-six (34.3%) had positive viremia. In plasma, 28 (82.4%) of the typable specimens were RV-C, five (14.7%) were EV-D68, and one was RV-A (2.9%). In all cases, the RV/EV type was identical in the plasma and respiratory specimens. In conclusion, RV/EV viremia is frequent in severe exacerbations of preschool recurrent wheezers, particularly in RV-C infections.

Performance evaluation of the quantitative assay Adenovirus ELITe MGB® Kit on EDTA-plasma, using the ELITe BeGenius® system.

BACKGROUND: Adenovirus infections constitute an important cause of morbidity and mortality after hematopoietic stem cell transplantation. Detection and monitoring of adenovirus in EDTA-plasma by real-time quantitative PCR is a sensitive tool for identification and management of patients at risk of a potentially fatal infection. OBJECTIVES: The aim of this study was to evaluate the analytical and clinical performance of the quantitative Adenovirus ELITe MGB® Kit (ELITechGroup S.p.A.) using the ELITe BeGenius® (ELITechGroup S.p.A.) system and compare the assay to a laboratory-developed quantitative real-time PCR assay. STUDY DESIGN: Analytical sensitivity of the Adenovirus ELITe MGB® Kit was determined by testing serial dilutions of the WHO standard. Detection of adenovirus serotypes was assessed using a panel of 51 serotypes. Clinical sensitivity and specificity were determined by comparing the Adenovirus ELITe MGB® Kit results with the laboratory-developed assay results of 155 retrospective and prospective EDTA-plasma samples from transplant recipients. RESULTS: The analytical sensitivity of the Adenovirus ELITe MGB® Kit was at least 54 (1.7 Log) IU/mL and the quantitative results showed a high correlation with the WHO standard (R2 = 0.9978; Pearson) within the range of 1.7 to 6.6 Log IU/mL. All 51 adenovirus serotypes were detected. The clinical specificity and sensitivity for EDTA plasma of the Adenovirus ELITe MGB® Kit were 97.4 % and 99.1 % respectively. CONCLUSION: The Adenovirus ELITe MGB® Kit performed on the ELITe BeGenius® system is a highly sensitive and specific assay for the detection of adenovirus in EDTA-plasma from transplantation patients.

Evaluation of the effect of fresh-frozen plasma transfusion on circulating hyaluronic acid concentration in critically ill dogs: a pilot study.

OBJECTIVE: To describe changes in circulating hyaluronic acid (HA) concentration, a biomarker of endothelial glycocalyx degradation, after administration of fresh-frozen plasma (FFP) in critically ill dogs. ANIMALS: 12 client-owned dogs receiving an FFP transfusion due to underlying disease. METHODS: Plasma samples were collected for HA concentration measurement pre-FFP transfusion (T0) and 10 minutes (T10) and 90 minutes (T90) following completion of FFP transfusion of a minimum volume of 7 mL/kg. Hyaluronic acid was also measured in the transfused FFP units following in-house validation of a commercial HA assay on citrate phosphate dextrose-anticoagulated plasma. Potential associations of the difference between pre-FFP and post-FFP HA plasma concentrations with the volume of FFP transfused, the cumulative volume of IV fluids administered during the study period, and the HA concentration in the transfused unit were explored. RESULTS: Concentrations of HA were not significantly different between pre- and post-FFP transfusion measurements. The volume of FFP transfused, the cumulative volume of other IV fluids administered during the study time, and the concentration of HA in the FFP units had no significant effect on the change in HA concentration following FFP transfusion in this study. CLINICAL RELEVANCE: This pilot study did not demonstrate an association between FFP administration and changes in plasma HA concentration. The results of this study may serve to help design future research. A commercial assay was validated to measure HA in citrate phosphate dextrose-anticoagulated plasma.

PON1 enzyme activity assays for serum and heparinized plasma in horses and stability evaluation of the enzyme activity over different freeze-thaw cycles and mimic transportation.

Consistent information and standardization procedures regarding the time of storage for frozen samples and the effects of storage time on enzyme activity are still missing in the literature. Thus, we evaluated the effects of different storage temperatures (-20 °C and - 80 °C), three repetitive freeze/thaw cycles, and 24-h mimic transportation on the activities of PON1 (paraoxonase and arylesterase), enzymes involved in the protection and detoxification processes of reactive molecules. PON1 enzymes' activity was validated on serum and heparinized plasma in horses. The results revealed that conditions and time of storage of blood samples for PON1 analyses altered the activities of both enzymes in both sample types, evidencing that these conditions can lead to protein degradation or general alteration. Specifically, paraoxonase and arylesterase activities significantly decreased among storage temperatures, with major effects detected at -20 °C. The repeated freeze/thaw cycles at -20 °C and 24-h mimic transport conditions also generated an expected degradation of the arylesterase in both serum and heparinized plasma while freeze/thaw cycles at -80 °C caused an increase of both arylesterase and paraoxonase activities on both sample types. In general, similar enzyme responses were detected between serum and heparinized plasma.

Temporal changes in plasma metabolic signatures to predict immune response of antiretroviral therapy among people living with HIV.

Antiretroviral therapy (ART) is an effective treatment for people living with HIV (PLHIVs), requiring an extended period to achieve immune reconstitution. Metabolic alterations induced by ART are crucial for predicting long-term therapeutic responses, yet comprehensive investigation through large-scale clinical studies is still lacking. Here, we collected plasma samples from 108 PLHIVs to the untargeted plasma metabolomics study, based on the longitudinal metabolomics design. Cross-sectional analyzes were performed at pre- and post-ART to explore the metabolic transformation induced by the therapy. Subsequently, delta values between pre- and post-ART measurements were calculated to quantify metabolic alterations. Then, the optimal set of metabolic traits and clinical signatures were further identified and applied to construct random forest model for predicting the future therapeutic responses to ART. We found distinct ART-induced metabolic transformation among PLHIVs. After confounder-adjustments, five metabolites exhibited significant associations with future immune response: tetracosatetraenoic acid (24:4n-6) (pre-ART) (odds ratio [OR]: 0.978, 95% confidence interval [CI]: 0.955~0.997), 1-(3,4-dihydroxyphenyl)-5-hydroxy-3-decanone (pre-ART) (OR: 1.298, 95% CI: 1.061~1.727), beta-PC-M6 (change) (OR: 0.967, 95% CI: 0.938~0.993), d-Galactaro-1,4-lactone (change) (OR: 1.032, 95% CI: 1.007~1.063), Annuionone C (change) (OR: 1.100, 95% CI: 1.030~1.190). The addition of plasma metabolites to clinical markers accurately predicted immune response to ART with an area under curve of 0.91. Notably, most disrupted metabolites were significantly correlated with blood lipids, suggesting that metabolic transformation might contribute to dyslipidemia among PLHIVs. This study highlights the distinct metabolic transformation post-ART among PLHIVs and reveals the potential role of metabolic transformation as key determinants of ART efficacy.

[Effect of stromal cell derived factor-1α combined with autologous platelet poor plasma on avulsion injury of permanent teeth].

PURPOSE: To explore the therapeutic effect of stromal cell derived factor-1α(SDF-1α) combined with platelet-poor plasma(PPP) on permanent tooth avulsion injury. METHODS: One hundred and forty-four patients with permanent tooth avulsion injuries admitted to Hengshui People's Hospital from March 2020 to March 2022, with a total of 152 affected teeth were included. They were randomly divided into experimental group of 72 cases(76 teeth) and control group of 72 cases(76 teeth). The control group underwent routine replantation surgery, and the root tips were soaked and rinsed with PPP biological solution before surgery. On the basis of the control group, the experimental group implanted SDF-1α into the alveolar fossa before in vitro tooth implantation for treatment. The patients were followed up for 12 months after surgery, the success rate of implantation, degree of postoperative occlusal pain, expression of inflammatory factors in gingival fluid, serum growth factor expression, and incidence of postoperative complications were compared between the two groups. Statistical analysis was performed with SPSS 19.0 software package. RESULTS: The success rate of replantation in the control group was 90.79%(69/76), while the experimental group was 98.68%(75/76). The success rate of replantation in the experimental group was significantly higher than that in the control group(P＜0.05). On the 2nd day, 3 months and 12 months after surgery, the pain scores of the two groups of patients gradually decreased (P＜0.05). There was no significant difference in pain scores between the two groups at each time point(P＞0.05). One month after surgery, the CRP and IL-6 levels in both groups decreased(P＜0.05), while the experimental group was significantly lower than the control group(P＜0.05). The soluble intercellular adhesion factor (sICAM-1) in both groups increased, and the experimental group was significantly higher than the control group (P＜0.05). One month after surgery, vascular endothelial growth factor(VEGF), fibroblast growth factor(FGF), transforming growth factor beta(TGF-ß)and platelet derived growth factor(PDGF) were all elevated, and the experimental group was significantly higher than the control group(P＜0.05). The incidence of postoperative complications in the experimental group was significantly lower than that in the control group(P＜0.05). CONCLUSIONS: The combination of PPP and SDF-1α in treating patients with permanent tooth avulsion injury has a high success rate of delayed replantation and a low incidence of postoperative adverse reactions.

[Modern problems of plasma donation services: global experience in solving them].

As an analysis of foreign literature on donation has shown, the global market for therapy with drugs from human plasma is growing, which leads to the need for large volumes. With significant geographic imbalances in the global plasma supply and the dependence of most countries on plasma supplies from the United States, the most vulnerable are low- and middle-income countries, where the challenge of meeting the demand for plasma products requires improvements to regional plasma donation systems. An effective tool for the development of plasma collection services is compliance with the standards of plasma donation services, the development of voluntary free plasma donation, and the optimization of donor recruitment and retention processes.

Accounting for differences between serum and plasma: An indirect approach to derive reference intervals for total protein, albumin, and globulin.

BACKGROUND: Observable quantitative variations exist between plasma and serum in routine protein measurements, often not reflected in standard reference intervals. In this study, we describe an indirect approach for estimating a combined reference interval (RI) (i.e., serum and plasma), for commonly ordered protein measurands: total protein, albumin, and globulin. METHODS: We applied an indirect reference interval estimation for protein measurements in serum and plasma using data from July 2018 to February 2024. The data were divided into three Epochs based on a period of plasma separator tube shortage during the COVID-19 pandemic. Bootstrap resampling was used to calculate RIs and corresponding 95% confidence intervals for each month. RESULTS: Our results demonstrate notable changes in RI limits for total protein, albumin, and globulin between Epochs, reflecting the influence of changing sample matrix. A combined RI was identified for all components and verified using plasma and serum samples from 20 healthy individuals and retrospective analysis of flagging rates on our outpatient population using new and historical RIs. CONCLUSION: The study demonstrates notable differences in the RIs for total protein, albumin, and globulin when container type changes. In addition, the results demonstrate the effectiveness of big data analytics in deriving RIs and highlights the necessity of continuous RI assessment and adjustment based on the patient population and acceptable specimen types.

Lyophilization as an alternative for conservation of equine plasma as a source of immunoglobulin G for neonatal foals.

Providing plasma with immunoglobulins is essential for the health of foals with failure of passive transfer of immunity. The use of lyophilized plasma (LP) offers a simple and affordable option in terms of transportation and storage. This study aimed to measure the concentrations of immunoglobulin G (IgG), total protein (TP), and total solids (TS) in fresh equine plasma before and after lyophilization. Plasma was collected from six healthy male horses. The samples underwent freeze-drying and were reconstituted in deionized water to their original volume. The concentrations of IgG in both fresh and reconstituted LP were determined by simple radial immunodiffusion and TS and TP concentrations measured using refractometry. Results indicated that the IgG concentration in fresh plasma (8.9 ± 3.2 g/L) was not different from LP (7.1 ± 2.2 g/L; P > 0.05). The TP concentration in fresh plasma was 6.6 ± 0.5 g/dL, which decreased to 5.7 ± 0.2 g/dL after lyophilization (P < 0.05). The TS of fresh plasma were 7.5 ± 0.8 %, and also lower in LP 6.3 ± 0.5 % (P < 0.05). The findings revealed that the lyophilization process preserves IgG concentration with small losses in TS and TP upon reconstitution. The research supports the potential of lyophilized equine plasma as a promising treatment option, with future efforts focused on optimizing the product, validating its efficacy and stability through clinical trials, and developing practical packaging solutions for use in the equine industry.