The application of certified reference materials for clinical mass spectrometry.

BACKGROUND: In the application process of clinical mass spectrometry, there are difficulties such as standardization, low degree of automation, complex instruments, and high requirements for operations, which will affect the accuracy and comparability of results. Reference materials are one of the major approaches to achieve measurement accuracy and metrological comparability. METHODS: Based on the problems of reference materials in clinical mass spectrometry, the precautions for the use of reference materials are summarized in the aspects of measurement method validation, calibrator usage, and quality control in this article. Additionally, combined with the previous experience of the author's laboratory, the operation mode and acceptance criteria of the new calibration solution lot replacement were formulated to ensure the continuous comparability of the measurement system. CONCLUSION: Carefully understand and correctly regulate the use and management of reference materials to ensure the accuracy of test results, thereby improving the comparability and consistency of results between laboratories.

The application of certified reference materials for clinical mass spectrometry / 中华检验医学杂志

Reference materials are one of the major approaches to achieve measurement accuracy and metrological comparability. Different functions of reference materials should also be distinguished when applied to mass spectrometry as an emerging technology in clinical laboratory. Proper reference materials for validation, calibration and quality control of measurement method can ensure the accuracy and comparability of test results. Based on the problems of reference materials in clinical mass spectrometry, the precautions for the use of reference materials are summarized in the aspects of measurement method validation, calibrator usage and quality control.

Proteomic and Metabolomic Characterization of COVID-19 Patient Sera

Severe COVID-19 patients account for most of the mortality of this disease. Early detection and effective treatment of severe patients remain major challenges. Here, we performed proteomic and metabolomic profiling of sera from 46 COVID-19 and 53 control individuals. We then trained a machine learning model using proteomic and metabolomic measurements from a training cohort of 18 non-severe and 13 severe patients. The model correctly classified severe patients with an accuracy of 93.5%, and was further validated using ten independent patients, seven of which were correctly classified. We identified molecular changes in the sera of COVID-19 patients implicating dysregulation of macrophage, platelet degranulation and complement system pathways, and massive metabolic suppression. This study shows that it is possible to predict progression to severe COVID-19 disease using serum protein and metabolite biomarkers. Our data also uncovered molecular pathophysiology of COVID-19 with potential for developing anti-viral therapies.

Application of LC-MS/MS in the accurate assessment of vitamins / 中华检验医学杂志

Vitamins are classified as either fat-soluble (vitamins A, D, E, K) or water-soluble (vitamins B and vitamin C). Traditional methods of immunoassay have only been developed for vitamins D,B6, B9 and B12. However, they cannot distinguish between vitamin subtypes such as D2, D3 and associated epi isomers (which has higher leveks in infants),giving false positive or negative results. Mass spectrometry has become a gold standard method for small molecule analysis in biological samples with its advantages in speed,resolution,sensitivity and specificity. It is widely used in clinical research and diagnosis and provides an efficient method for simultaneous detection of multivitamins in one injection using one low volume sample collection.

Effectiveness analysis of humanistic care nursing applicated in otorhinolaryngology endoscopy / 中国基层医药

Objective To explore the effectiveness of humanistic care nursing applicated in otorhinolaryngology endoscopy.Methods 124 patients with otorhinolaryngology endoscopy were selected as the research subjects,and they were randomly divided into two groups according to the digital table,62 cases in each group.The normal group was given the general nursing measures,the research group was given the humanistic care in nursing care concept.And then,the HAMA scores,HAMD scores,satisfaction and incidence of adverse reactions were compared between the two groups.Results The HAMA scores and HAMD scores of the two groups before nursing had no significant differences (t =0.452,0.526,all P ＞ 0.05).The patients of the two groups all suffered from mild anxiety and depressive symptoms.After nursing,the HAMA scores of the research group[(7.51 ± 0.25) points] and HAMD scores[(9.30 ± 0.10) points] decreased obviously lower,it showed the patients' anxiety and depression significantly improved,there were statistically significant differences compared with the normal group (t =5.231,4.798,all P ＜ 0.05).The patients'satisfaction rate of the research group was 96.77％,which of the normal group was only 82.23％,the difference between the two groups was statistically significant (x2 =6.328,P ＜ 0.05).Conclusion Patients with otorhin olaryngology endoscopy in daily nursing into humanistic care nursing concept can achieve more significant effect,and it can significantly improve patients with bad mood and nursing satisfaction,reduce the incidence of adverse reactions,and it is worthy of recommending to adopt.