Analysis of Results of Donor Blood Screening Tests of Hanmaeum Blood Center (2011~2020) / 대한수혈학회지

Background@#According to blood management law, serology and nucleic acid testing (NAT) are performed for HIV, HBV, HCV, and others as blood screening tests in Korea. The blood screening tests for HIV, HBV, and HCV have substantially improved transfusion safety. The blood screening results of one blood center were investigated because there is little domestic data available on screening tests. @*Methods@#The blood donation records and screening tests results of a supplying blood center were analyzed retrospectively from January 2011 to December 2020 in Korea. Annual first-time donation numbers, sex, and age distribution of donors were investigated during 10 years. The positivity of ALT, HBsAg, anti-HCV, and anti-HIV antibody testing and the positive cases of HIV, HCV, and HBV NAT were inquired. @*Results@#For 10 years, the blood center has collected 1,896,392 units of blood, and male donation was 1,239,873 units, which was 65.38% of total blood donation. ALT abnormal blood units were 2.06% in 2011, 2.14% in 2013, and 0.81% in 2019. The donor screening test showed HBsAg 0.03%, anti-HCV 0.02%, and anti-HIV 0.06% positivity at 2020. NAT yield cases were three with HIV, two with HCV, and 260 with HBV for 10 years. @*Conclusion@#The positivity of serology screening tests of the Hanmaeum blood center showed a decreasing trend, and the transfusion of nucleic acid positive but serologically negative blood could be prevented by performing NAT.

Suggestions for Specialization and Enhancing Capacity in National Blood Services / 대한수혈학회지

Blood is an essential medical resource for treating diseases and trauma of people, but a limited biological resource for which no artificial production is possible. Therefore, systematic and rational management of its supply and use must be carried out under the national responsibility. On the other hand, the low birthrate and aging population have raised the problem of blood shortages in Korea. To help solve this problem, this study examined proposals for the development of a blood management system in Korea. In addition, the works of blood management bodies were analyzed based on the operation subjects and types of blood projects in the United States, the United Kingdom, France, Germany, the Netherlands, Canada, Australia, Singapore, and Japan. Based on these data, this paper proposes a new organization that can best enhance the specialization of national blood services and strengthen its capacity under the current blood supply system in Korea.

How Does COVID19 Affect Blood Transfusion and Blood Management? / 대한수혈학회지

The scientific interest in transfusion medicine as related to COVID19 can be summarized in three important points. 1) How can we identify asymptomatic COVID19 infected potential blood donors from healthy donors, and if the asymptomatic COVID19 infected person has donated blood and it has been transfused, how will it affect the transfused patient? 2) What affect will COVID19 have on blood establishments and medical institutions that use blood? 3) How will convalescent plasma from recovered COVID-19 patients be collected and then be used for patients in need of it? Since COVID19 has a negative effect on blood transfusion and blood management, well developed lines of communication and cooperation from blood establishments, medical institutions, government agencies, and people are urgently needed to overcome the impact of this negative effect.

Comparative Evaluation of the HPV28 Detection and HPV DNA Chip Test for Detecting and Genotyping Human Papillomaviruses

BACKGROUND: The HPV28 Detection test (Seegene) is a real-time polymerase chain reaction assay that is designed for testing a total of 28 human papillomavirus (HPV) genotypes and estimating the approximate HPV viral load. The aim of this study was to evaluate the clinical applicability of the HPV28 Detection test with regard to the prevalence of HPV infection and distribution of HPV genotypes by using the HPV28 Detection and HPV DNA Chip tests (Biomedlab). METHODS: HPV DNA Chip and HPV28 Detection tests were performed for 500 cervical swab specimens. HPV genotype results were confirmed by sequencing analysis of the specimens that showed discordant results in the 2 test methods. RESULTS: The positive rate of HPV detection determined by using HPV28 Detection and HPV DNA Chip tests were 43.8% and 40.6%, respectively. The sequencing results in 64 discordant specimens that showed single HPV infection in the 2 test methods were in complete agreement with the test results obtained with the HPV28 Detection test. The genotyping results of the HPV28 Detection test were 100% concordant in repeated experiments with HPV-infected specimens that have 12 different HPV genotypes, i.e., types 16, 31, 33, 39, 42, 51, 52, 53, 58, 66, 68, and 70. The HPV28 Detection test was 100-fold more sensitive than the HPV DNA Chip test with serially diluted HPV DNAs. CONCLUSIONS: The HPV28 Detection test can be applied in the clinical field as an HPV genotyping test can accurately identify various HPV genotypes with high specificity and low detection limit.

Performance Evaluation of the OraQuick Hepatitis C Virus Rapid Antibody Test

BACKGROUND: A reliable rapid assay for hepatitis C virus (HCV) may be helpful in various clinical settings. We evaluated the performance of the OraQuick HCV Rapid Antibody Test (OraSure Technologies Inc., Bethlehem, PA, USA). METHODS: Clinical sensitivity and specificity were evaluated with oral fluids and sera from 137 patients diagnosed with hepatitis C and 300 healthy blood donors in a multi-center collaborative study. The stored sera of 200 proven HCV-infected patients and 200 healthy subjects were also evaluated. Analytical sensitivity was estimated with 4 commercial seroconversion panels and 7 Korean reference panels. The performance of 4 laboratory-based tests (3 chemiluminescence assays and 1 enzyme immunoassay) and 4 rapid test kits was compared. We also assessed the interference due to bilirubin, hemoglobin, lipid, rheumatoid factor, multipara, and several viral infections. RESULTS: The clinical sensitivity and specificity of the OraQuick HCV test using oral fluid were 97.8% (95% confidence interval [CI], 93.2-99.4%) and 100% (95% CI, 98.4-100%), respectively. The clinical sensitivity using serum samples was 100%. Using the 4 seroconversion panels, the OraQuick HCV test showed results comparable to those of the laboratory-based assays; its analytical sensitivity was higher than that of the other rapid test kits. There was no cross-reactivity with common interfering factors. CONCLUSIONS: The clinical performance of the OraQuick HCV Test is comparable to that of laboratory-based tests with both serum and oral fluid. This supports the supplementary use of rapid HCV testing using oral fluid in various medical and non-medical settings.

Performance Evaluation of the OraQuick Hepatitis C Virus Rapid Antibody Test

BACKGROUND: A reliable rapid assay for hepatitis C virus (HCV) may be helpful in various clinical settings. We evaluated the performance of the OraQuick HCV Rapid Antibody Test (OraSure Technologies Inc., Bethlehem, PA, USA). METHODS: Clinical sensitivity and specificity were evaluated with oral fluids and sera from 137 patients diagnosed with hepatitis C and 300 healthy blood donors in a multi-center collaborative study. The stored sera of 200 proven HCV-infected patients and 200 healthy subjects were also evaluated. Analytical sensitivity was estimated with 4 commercial seroconversion panels and 7 Korean reference panels. The performance of 4 laboratory-based tests (3 chemiluminescence assays and 1 enzyme immunoassay) and 4 rapid test kits was compared. We also assessed the interference due to bilirubin, hemoglobin, lipid, rheumatoid factor, multipara, and several viral infections. RESULTS: The clinical sensitivity and specificity of the OraQuick HCV test using oral fluid were 97.8% (95% confidence interval [CI], 93.2-99.4%) and 100% (95% CI, 98.4-100%), respectively. The clinical sensitivity using serum samples was 100%. Using the 4 seroconversion panels, the OraQuick HCV test showed results comparable to those of the laboratory-based assays; its analytical sensitivity was higher than that of the other rapid test kits. There was no cross-reactivity with common interfering factors. CONCLUSIONS: The clinical performance of the OraQuick HCV Test is comparable to that of laboratory-based tests with both serum and oral fluid. This supports the supplementary use of rapid HCV testing using oral fluid in various medical and non-medical settings.

The Hemoglobin Distribution of Korean Blood Donors / 대한수혈학회지

BACKGROUND: The current donor selection criteria need to be revised to ensure a reliable blood supply and for donor protection. This study was conducted to analyze the distribution of hemoglobin (Hb) levels of blood donors and to estimate the change of eligible donors when using the revised Hb criterion. METHODS: The Hb levels of all the blood donors who visited the Korean Red Cross Blood Center (KRCBC) between November 9th, 2010 and November 15th, 2010 were measured with a portable hemoglobinometer (HemoCue). The Hb levels of all the eligible donors and some of the deferred donors who visited the Hanmaeum Blood Center (HBC) from April 26th, 2010 to April 30th, 2010 and from November 9th, 2010 to November 15th, 2010 were measured with a portable hemoglobinometer (Hemo_Control). RESULTS: A total of 7,521 donors (6,500 eligible donors and 1,021 deferred donors) were enrolled. The donation eligibility rate at the KRCBC, which is where all the donors were examined, was 84.2% (3,409/4,049) and the deferral rate was 15.8% (640/4,049). The percent of blood donors whose Hb level was less than 12.5 g/dL was 2.1% of the men (44/2,145) and 34.9% of the women (664/1,904), respectively. The percent of female deferred donors with a Hb level of 12.0~12.4 g/dL was 19.3% (109/564) and the percent of male eligible donors with a Hb level of 12.5~12.9 g/dL was 2.6% (54/2,069). At the HBC, and with some deferred donors being excluded, the deferral rate of males and females was 2.0% (36/1,799) and 20.6% (345/1,673), respectively. CONCLUSION: About 20% of the female deferred donors could be expected to participate when a less strict Hb criterion (> or =12.0 g/dL) is applied. This study is thought to be helpful in order to determine the number of donors according to the Hb criteria and to create improved criteria.

Survey Analysis of the Current Blood Donor Interview / 대한수혈학회지

BACKGROUND: An objective and standardized interview process is important when screening for healthy blood donors. Our aims were to gather opinions of the interviewing nurses at blood centers on the current donor interview and to suggest improvements to the interview. METHODS: We conducted an anonymous survey consisting of five questions regarding the donor health questionnaire, which can be found on the reverse side of the donation record card. The survey targeted the interviewing nurses with more than 1 year of experience at collection sites of the Korean Red Cross and the Hanmaum blood centers. The survey was sent out and gathered via mail, fax or email between September and October of 2010. RESULTS: The average self-deferral rate of donors prior to interview was 7.4%, and 66.7% of the interviewing nurses considered 'taking medicine' as the most common reason for donor self-deferral. The past and current history of disorders was the hardest question for nurses to determine the eligibility of the donors. Having a history of blood transfusion, surgery, tattoo or a piercing procedure, etc. within a year was the most unacceptable reason for deferred donors. The nurses strongly recommended revision of redundant questions as well as re-examining the unsolvable dilemma of questions concerning malaria. CONCLUSION: According to the survey, this study outlines the perspectives of interviewing nurses at blood centers regarding the rate and reasons for self-deferral of blood donors, the difficulties and the suggestions for improving the current donor interview. The results will be helpful in the future when proposing modifications to the donor interview.

Annual Report on External Quality Assessment in Blood Bank Tests in Korea (2009) / 임상검사와정도관리

BACKGROUND: We report here the results of surveys for external quality assessment of blood bank tests performed in 2009. METHODS: Survey specimens were sent three times to 488, 491 and 490 participant institutes, and the response rates for the 1st, 2nd and 3rd trial were 97.7%, 98.0%, and 98.0%, respectively. Test items for the surveys were ABO grouping, Rh (D) typing, crossmatching, direct antiglobulin test, antibody screening and antibody identification test. RESULTS: The average accuracy rates of ABO grouping and Rh typing were 99.6-100% and 98.5-100%, respectively. In crossmatching test, the accuracy rates were 99.3-99.8% for the compatible samples, 92.7-100% for the incompatible samples, and 92.6-93.1% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 98.5-100% for negative samples and 98.1-98.8% for positive samples. The correctresults were reported by 98.0-100% of the surveyed institutions for antibody screening test and 82.9-100% for antibody identification test. Nineteen institutions gave repeatedly incorrect answers for crossmatching test. Eight institutions out of them gave incorrect answers for all the test specimens sent out 3 times last year. CONCLUSIONS: The overall results of this survey were good, however, it is required that the institutions where the incorrect results were reported should perform corrective actions for quality improvement.

A Study to Verify the Stability of Currently Stored Blood Donor Samples (A First Year Study) / 대한수혈학회지

BACKGROUND: The Korean Red Cross (KRC) has stored blood donor samples for 10 years under -20degrees C since 2004. These samples have been used for investigating transfusion related infections and for Look-back studies. We designed an experimental scheme to verify the stability of stored blood samples. METHODS: We collected and prepared samples such as blood donor samples (HBV, HCV, HIV nucleic acid positive; n=90), the HIV infected patient samples (n=20), the WHO nucleic acid international standards serologic positive samples (HBsAg, anti-HCV, anti-HIV; n=120) and the negative samples (n=20). The samples were aliquoted in cryo tubes with volumes of 0.5~5 mL and they were stored at -20~-30degrees C and -70~-80degrees C. We used enzyme immunoassay, chemiluminescence immunoassay and quantitative PCR for the base line and the follow up studies. The linear mixed statistical model using SAS 9.1 for windows was used for statistical analysis. RESULTS: The results of the baseline test of the stored samples showed a variable range of viral load (10(1)~10(7) IU/mL or copies/mL) and optical density (S/CO 3.0~500). The results of the stored samples after 6 month (n=82) did not show any significant differences compared to the baseline data for the viral loads (P>0.05) and the qualitative serologic tests. CONCLUSION: We established an experimental scheme to verify the stability of the stored blood donor samples. From now on, the stability of the stored samples is going to be monitored by every 6 month for 10 years.

Effectiveness of Sodium Fluoride as a Glycolysis Inhibitor on Blood Glucose Measurement: Comparison of Blood Glucose using Specimens from the Korea National Health and Nutrition Examination Survey / 대한진단검사의학회지

BACKGROUND: Accurate measurement of blood glucose concentrations is essential for defining diabetes, and the minimization of ex vivo glycolysis has been recommended. Recent guidelines advocate two kinds of methods for sample collection and processing: either the sodium fluoride (NaF) method or immediate refrigeration using a serum separation tube (SST). We investigated the difference between the two methods in measuring subsequent glucose concentrations using blood specimens from participants recruited for the fourth Korean National Health and Nutrition Examination Survey. METHODS: Paired venous blood samples were collected in an SST and a NaF tube from 1,103 men and women. SST serum was separated within 30 min, including standing for 15 min, and then refrigerated. The NaF samples were refrigerated, but not separated until immediately before analysis. We compared the blood glucose concentrations between the SST (SST glucose) and NaF (NaF glucose) methods. RESULTS: The mean SST glucose was significantly higher than NaF glucose (99.0 mg/dL vs 96.5 mg/dL, P<0.05). NaF glucose showed a negative mean bias of 2.6 mg/dL vs SST glucose but showed high correlation (R=0.9899). There was no significant correlation between the bias of blood glucose concentrations by two methods and the storage time of NaF glucose. CONCLUSIONS: The negative bias associated with the use of NaF tubes may significantly affect the prevalence of diabetes. Serum separation and refrigeration within 30 min after venous sampling is recommended over NaF method, not only to minimize the preanalytical impact on detecting diabetes but also to reduce sample volume and number of tubes.

Genetic Analysis of Hepatitis A Virus Isolated from Korea

Hepatitis A virus (HAV) is one of the most important causes of acute infectious hepatitis. The aim of this study was to determine the genotypes of HAV that have been circulating in Koreans. A total of 76 sera referred to our institute for HAV genotyping from 11 Korean provinces were used for this study. Those samples were diagnosed by positive of IgM anti-HAV. HAV RNA was extracted from 150 microliter of serum, and reverse transcription PCR-sequencing was used to detect and characterize HAV RNA. Primer pairs from the VP1/2A region of the HAV were used for amplification and sequencing. HAV RNA was found in 64.5% (n = 49) of the 76 patient sera with acute hepatitis A. Forty-seven strains were genotype IIIA in a total of 49 isolated strains (95.9%, 47/49); only two strains belonged to genotype IA (4.1%, 2/49). Thirty eight genotype IIIA isolates were 100% identical to consensus amino acid sequences of the reference strain AJ299467. The amino acid change of L772F was found in two IIIA strains; other IIIA isolates showed one amino acid change. Amino acid of genotype IA was compared to reference strain L20541. K801R was found in 1 strain and Q810S in both strains. The amino acid change of K801R was the first report in Koreans. Until recently HAV genotype IA has been reported as a major circulating HAV genotype in Koreans. In the present study, the predominant HAV strain in Koreans seemed to be HAV genotype IIIA.

Annual Report on External Quality Assessment in Blood Bank Tests in Korea (2008) / 임상검사와정도관리

We report here the results of surveys for external quality assessment of blood bank tests performed in 2008. Survey specimens were sent three times to 460, 470 and 473 participant institutes, and the response rates for the 1st, 2nd and 3rd trial were 97.6%, 97.7%, and 97.7%, respectively. Test items for the surveys were ABO grouping, Rh (D) typing, crossmatching, direct antiglobulin test, antibody screening and antibody identification test. The average accuracy rates of ABO grouping and Rh typing were 100% and 98.3-100%, respectively. In crossmatching test, the accuracy rates were 97.5-99.7% for the compatible samples, 92.4-99.2% for the incompatible samples, and 88.2-98.9% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 98.4-99.7% for negative samples and 93.4-99.7% for positive samples. The correct results were reported by 99.6-100% of the surveyed institutions for antibody screening test and 98.2-100% for antibody identification test. Twenty-three institutions gave repeatedly incorrect answers for crossmatching test. Ten institutions out of them gave incorrect answers for all the test specimens sent out 3 times last year.

Annual Report on External Quality Assessment in Blood Bank Tests in Korea (2007) / 임상검사와정도관리

We report here the results of external quality assessment of blood bank tests performed in 2007. Survey specimens were sent three times to 448, 450, and 455 participant institutes, and the response rates were 99.3%, 97.3%, and 98.0%, respectively. Test items for the surveys were ABO grouping, Rh(D) typing, crossmatching, direct antiglobulin test, antibody screening and identification test. The average accuracy rates of ABO grouping and Rh typing were in the range of 99.5-100% and 98.9-100%, respectively. In crossmatching test, the accuracy rates were 96.0-97.1% for the compatible samples, 89.6-92.4% for the incompatible samples, and 89.6-92.4% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 98.0-99.7% for negative samples and 96.3-99.0% for positive samples. The correct results were reported by 95.7-100% of the surveyed institutions for antibody screening test and 98.2-100% for identification test. Fifteen institutions gave repeatedly incorrect answers for crossmatching. Five institutions out of them gave incorrect answers for all the test specimens sent out 3 times last year.

Annual Report on External Quality Assessment in Blood Bank Tests in Korea (2007) / 임상검사와정도관리

We report here the results of external quality assessment of blood bank tests performed in 2007. Survey specimens were sent three times to 448, 450, and 455 participant institutes, and the response rates were 99.3%, 97.3%, and 98.0%, respectively. Test items for the surveys were ABO grouping, Rh(D) typing, crossmatching, direct antiglobulin test, antibody screening and identification test. The average accuracy rates of ABO grouping and Rh typing were in the range of 99.5-100% and 98.9-100%, respectively. In crossmatching test, the accuracy rates were 96.0-97.1% for the compatible samples, 89.6-92.4% for the incompatible samples, and 89.6-92.4% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 98.0-99.7% for negative samples and 96.3-99.0% for positive samples. The correct results were reported by 95.7-100% of the surveyed institutions for antibody screening test and 98.2-100% for identification test. Fifteen institutions gave repeatedly incorrect answers for crossmatching. Five institutions out of them gave incorrect answers for all the test specimens sent out 3 times last year.

Survey Results of Medical Insurance Reimbursement System for Independent Medical Laboratories in Korea / 대한진단검사의학회지

BACKGROUND: A questionnaire survey was performed to perceive the problem of the current medical insurance reimbursement system for laboratory tests referred to independent medical laboratories; then, we intended to find a way to improve the reimbursement system. METHODS: Questionnaires were distributed to 220 independent medical laboratories and 700 laboratory physicians from July through October 2005. Frequency analysis was used to analyse the replies from 109 respondents to 25 questionnaire items regarding the current medical insurance reimbursement system for referral tests, problems with the system, and suggestions for the improvement of the system. RESULTS: Among the 109 respondents to this survey, 49 (45.8%) considered the current reimbursement system to be unsatisfactory, while only 16 (15.0%) answered satisfactory. The problem was that the referral clinics-not the laboratories that performed the tests--would first receive their reimbursement for the laboratory tests from Health Insurance Review Agency (HIRA) and then give a portion of the laboratory test fees to the independent medical laboratories after the deduction of administrative fees. They (62.5% of the respondents) would prefer a separated reimbursement system by which the referral clinic-as well as the independent medical laboratory-would receive their reimbursement directly from HIRA through an Electronic Data Interchange (EDI) system. In this new system, 34% of the respondents expected the quality of the laboratory tests to be improved; however, 41.6% answered that the income of the referral clinic is expected to decrease. CONCLUSIONS: For the improvement of the medical insurance reimbursement system, the administrative fee for the referral clinic and the test fee for the independent medical laboratory should be reimbursed directly to the respective organizations. These changes could be made possible with the proper analysis of medical costs and the development of an effective EDI reimbursement system.

Annual Report on External Quality Assessment in Blood Bank Tests in Korea (2005) / 임상검사와정도관리

We report here the results of surveys for external quality assessment of blood bank tests performed in 2005. Response rates for the 1st, 2nd and 3rd trial were 97.0%, 96.8%, and 97.1% respectively. Test items for the surveys were ABO grouping, Rh(D) typing, crossmatching, direct antiglobulin test, antibody screening and identification test. The average accuracy rates of ABO grouping and Rh typing were in the range of 99.5-100% and 99.7-100% respectively. In crossmatching test, the accuracy rates were 94.3-98.2% for the compatible samples, 88.5-92.9% for the incompatible samples, and 88.5-92.9% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 98.9-99.3% for negative samples and 89.2-96.9% for positive samples. The correct results were reported by 98.3-100% of the surveyed institutions for antibody screening test and 98.9-100% for identification test. Seventeen institutions gave repeatedly incorrect answers for crossmatching. Thirteen institutions out of them gave incorrect answers for all the test specimens sent out 3 times last year.

Practice Characteristics and Relative Value of Laboratory Physician's Work / 대한진단검사의학회지

BACKGROUND: The Korean Medical Association intends to determine the relative value of physician's work separately from the total relative value scale for each medical or surgical procedure. This study was designed by the Korean Society for Laboratory Medicine to determine the relative value of laboratory physician's work (LPW) in each diagnostic test. The LPW was clearly defined first and then its relative value was measured quantitatively on the basis of time and intensity of work. METHODS: LPW in the laboratory test was categorized into three parts, pre-service, intra-service, and post-service. The relative value of physician's work was measured using Rasch paired comparisons. RESULTS: Practice characteristics of LPW were clearly defined according to the pre-service, intraservice, and post-service. However, any laboratory physician's effort to improve the quality of laboratory work, which could not be measured in each test, had to be comprised in a pre-service designated separately as `comprehensive pre-service'. Rasch analysis based on the rating survey for LPW taken by a diverse group of laboratory medicine and other medical specialists revealed higher values than those assigned previously in many routine diagnostic tests (e.g., Gram stain, hemoglobin, anti-HBs, ABO cell type). The results obtained by applying Rasch regression analysis showed that the diagnostic tests that had been given a low relative value of LPW tended to be measured with more improved relative valuation. CONCLUSIONS: LPW for quality control and quality improvement was acknowledged with an improved relative valuation, even in the routine diagnostic test, as the results of Rasch analysis based on the rating survey. LPW might be further equated across the specialties, considering the practice characteristics of LPW.

Annual Report on External Quality Assessment in Blood Bank Tests in Korea (2003) / 임상검사와정도관리

We report here the results of surveys for external quality assessment of blood bank tests performed in 2003. Response rates for the 1st, 2nd and 3rd trial were 93.1%, 91.7%, and 90.1%, respectively. Test items for the surveys were ABO grouping, Rh(D) typing, crossmatching, direct antiglobulin test, antibody screening and identification test. The average accuracy rates of ABO grouping and Rh typing were in the range of 99.7-100% and 99.7-100%, respectively. In crossmatching test, the accuracy rates were 97.4-100% for the compatible samples, 83.4-100% for the incompatible samples, 87.2-92.4% for the samples which were incompatible in albumin phase, and 83.4-88.8% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 97.9-99.6% for negative samples and 93.8-95.0% for positive samples. The correct results were reported from 95.9-100% of the surveyed institutions for antibody screening test and 98.8-100% for identification test. Forty six institutions gave repeatedly incorrect answers for crossmatching. Nine out of 46 institutions gave incorrect answers for all the test specimens sent out 3 times last year.

Annual Report on External Quality Assessment in Blood Bank Tests in Korea (2002) / 임상검사와정도관리

We report here the results of surveys for external quality assessment of blood bank tests performed in 2002. Response rates for the 1st, 2nd and 3rd trial were 91.0%, 91.6%, and 91.8%, respectively. Test items for the surveys were ABO grouping, Rh(D) typing, crossmatching, direct antiglobulin test, antibody screening and identification test. The average accuracy rates of ABO grouping and Rh typing were in the range of 99.4-100% and 97.4-100%, respectively. In crossmatching test, the accuracy rates were 92.5-98.3% for the compatible samples, 73.7-99.7% for the incompatible samples, 88.0% for the samples which were incompatible in albumin phase, and 73.7% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 96.3-98.4% for negative samples and 95.9-97.0% for positive samples. The correct results were reported by 98.6-100% of the surveyed institutions for antibody screening test and 100% for identification test. Forty six institutions gave repeatedly incorrect answers for crossmatching. Nine institutions out of them gave incorrect answers for all the test specimens sent out 3 times last year.