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.
Blood Banks* ; Coombs Test ; Korea* ; Mass Screening

No abstract available.
Coombs Test* ; Hot Temperature* ; Humans ; Infant, Newborn*

We report here the results of surveys for external quality assessment of blood bank tests performed in 2004. Response rates for the 1st, 2nd and 3rd trial were 96.4%, 96.8%, and 96.8%, 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 100% and 100%, respectively. In crossmatching test, the accuracy rates were 96.2-97.8% for the compatible samples, 75.5-90.6% for the incompatible samples, and 75.5-90.6% for the samples which could be detected as incompatible only by antiglobulin method. The accuracy rates of direct antiglobulin test were 98.8-100% for negative samples and 87.3-98.8% for positive samples. The correct results were reported by 98.8-100% 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.
Blood Banks* ; Coombs Test ; Korea* ; Mass Screening

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.
Blood Banks* ; Coombs Test ; Korea* ; Mass Screening

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.
Blood Banks* ; Coombs Test ; Korea* ; Mass Screening

The association rate of antibody with antigen has been reported to be greatly increased by lowering ionic strength. Low-ionic strength salt solution(LISS) method has been used for the detection of various alloantibodies. To investigate the sensitivity of LISS in indirect antiglobulin test, a comparison study of LISS with saline and albumin methods was conducted. A total of 32 patients' samples requested for indirect antiglobulin test were evaluated. Out of 32 patients with clinical immune hemolytic anemia, 11(34.3%) were positive in 37 degrees C saline antiglobulin test, 18(56.2%) in albumin antiglobulin test, 23(71.8%) in LISS antiglobulin test respectively. These results were statistically analyzed using non parametric Page's test for ordered alternatives. LISS method is more sensitive than 37 degrees C saline method or albumin method significantly (p<0.01).
Anemia, Hemolytic ; Coombs Test* ; Humans ; Isoantibodies ; Osmolar Concentration

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.
Academies and Institutes ; Blood Banks ; Coombs Test ; Korea ; Mass Screening

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.
Academies and Institutes ; Blood Banks ; Coombs Test ; Korea ; Mass Screening

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.
Academies and Institutes ; Blood Banks ; Coombs Test ; Korea ; Mass Screening

The blood bank of the Seoul National University Hospital has joined the U.K. National External Quality Assessment Scheme(NEQAS) for Blood Group Serology since 1992. We reported correct answers on all occasions for thirty-six samples tested for ABO, RhD typing, and direct antiglobulin test. Among 36 antibody screening and antibody,,identification tests, we missed one anti-S. Among 96 crossmatchings, we made 4 major errors and one minor error. It was interesting that all of the major errors we made were from the sample delivered in mid-summer. Since the items included in the domestic program for the external quality control of blood group serology are very limited in Korea, joining any international quality control program will be necessary for larger blood banks to assure quality of varirous blood bank tests being performed.
Blood Banks ; Coombs Test ; Korea ; Mass Screening ; Quality Control ; Seoul