We evaluated the clinical usefulness of simultaneous LISS/Coombs and NaCl/Enzyme testing using the gel method for screening and identification of unexpected antibodies in 15,014 samples. When unexpected antibodies were detected by either screening test, those antibodies were identified using both the LISS/Coombs and the NaCl/Enzyme gel test. The positive screening rates of the LISS/Coombs, NaCl/Enzyme, and combined tests (excluding 25 autoantibody cases) were 0.48%, 1.29%, and 1.39%, respectively. Among the 57 samples positive by both screening methods, the antibodies in 19.3% could be identified only by the NaCl/Enzyme method. Among the 137 samples positive only by NaCl/Enzyme screening, 74.5% showed positive results in antibody identification only by the NaCl/Enzyme test, although 7.3% were also positive in the LISS/Coombs test. The NaCl/Enzyme method thus showed about threefold higher detection rates than the LISS/Coombs method, especially in screening for Rh antibodies, and higher exact identification rates and discriminatory power for identifying mixed antibodies. Addition of the NaCl/Enzyme method to routine laboratory procedures may detect and identify considerable numbers of significant antibodies that might be missed if only the LISS/Coombs method is used.
Antibodies/*analysis/immunology ; *Coombs' Test ; Erythrocytes/*immunology ; Hemagglutination Tests/*methods ; Humans ; Isoantibodies/analysis ; Reagent Kits, Diagnostic

BACKGROUND: The frequencies and distributions of unexpected antibodies have been reported using two different criteria, based on either number of persons tested or number of tests performed. But there has been no study that compared the results of analyses based on these two different criteria using the same data set. METHODS: Unexpected antibody tests performed in a University Hospital during recent 6 yr (January 2002-December 2007) were retrospectively analyzed: 76,985 tests (59,503 persons) for screening and 875 tests (749 persons) for identification. Data were analyzed using two different criteria, based on 'persons tested' and 'tests performed'. Antibodies had been screened and identified using LISS/Coombs gel cards with DiaMed-ID system (DiaMed AG, Switzerland). RESULTS: Frequencies of unexpected antibodies based on 'persons tested' and 'tests performed' were 1.32% and 1.34%, respectively (P=0.88). For frequently detected as well as rarely detected antibodies, there were no significant differences in the frequencies based on two different criteria. However, for rarely detected antibodies (anti-Xg(a) and Anti-E & D), the frequencies based on 'tests performed' were higher than those based on 'persons tested', affecting a change in the order of frequencies of antibodies detected. CONCLUSIONS: As there were no significant differences in the frequencies of unexpected antibodies calculated using two different criteria, both criteria can be used together for the patient population in our hospital. However, two criteria should be compared to validate the results for other populations.
Blood Group Antigens/*immunology ; Data Interpretation, Statistical ; Humans ; Isoantibodies/blood/*immunology ; Retrospective Studies

OBJECTIVETo investigate the correlation between the platelet GP specific antibodies/HLA antibodies and platelet transfusion refractoriness (PTR).

METHODSSixty-five patients with PTR were selected in this study and were genotyped for HLA-A and HLA-B as well as HPA systems by standard PCR-SSP assays. The platelet GP specific antibodies and HLA antibodies in serum and platelet elution were tested with a solid phase ELISA.

RESULTSThe HLA-A/B antigens and the frequencies of HPA-1, 2, 4, 5, 6, 9, 15 antigens in PTR patients had no difference from those in healthy donors. The freguencies of HPA-3a and 3b were 0.65 and 0.35, respectively. There was statistical difference between the 65 PTR patients and the healthy donors in HPA-3 freguencies (P < 0.05). Twenty-four patients (36.9 %) only expressed HLA antibodies, and 14 (21.5%) expressed HLA and platelet GP specific antibodies. The highest expression of anti-HLA-A/B specific antibodies was -A*9(46.2 %)/-B*40(33.6%), respectively. In serum, GPIIb/IIIa was expressed (26.2%), followed by GPIa/IIa (21.5 %). In platelet elution, GPIIb/IIIa was expressed of 41.5% and GPIb/IX 41.5%. Pedigree study was carried out for 2 patients. The results showed that the platelet GP specific antibody/HLA antibody developed in PTR patients was highly related to the mismatch with the platelet antigen/HLA antigen in their parents.

CONCLUSIONThe expressions of the HLA and platelet GP specific antibodies are the most important reason in PTR, it's meaningful to explore the correlation between PTR and HLA and HLA-A/B antigen in guiding platelet transfusion.

The objective of this study was to investigate the serologic characters of enzyme-only red cell antibody and its clinical significance, and to provide basis for the safety of blood transfusion. The patient serum containing enzyme-only antibody was used to react with the red cells of donors, panel cells and auto-cells in various medium. Absorption and elution test were also per formed. The results showed that this blood sample was found to contain an antibody that reacted with donor red cells and panel cells only in papain medium, but was not demonstrable by indirect antiglobulin test and other method s. Decline of antibody titers was observed after absorption test, but antibody activity was not detected in the elute. The patient underwent transfusion with 600 ml of Rh type identical RBCs, without any hemolytic transfusion reaction. In conclusion, enzyme-only antibody usually doe s not lead to hemolytic transfusion reaction.
Aged ; Aged, 80 and over ; Erythrocytes ; immunology ; Hemolysis ; Humans ; Isoantibodies ; immunology ; Male ; Papain ; pharmacology ; Transfusion Reaction

The irregular antibodies are other than antibodies from ABO blood group system because of pregnancies and blood transfusions, clinical autoimmune, drug-induced etc. The irregular IgG and/or IgM antibodies emerge and lead to the difficult identification of clinical blood type, difficult matching of blood, hemolytic disease of newborn, hemolytic transfusion reaction, and so on. It is very necessary to screen and identify the irregular antibodies before blood transfusion or antepartum. For some difficult identifying samples, some detections on serological level should be done firstly, combining with flow cytometry analysis, the difficult-matching patients' genotypes and fetal genotypes were detected by molecular biology techniques such as PCR and PCR-SSP in order to further predict fetal hemolytic disease of newborn and to provide the right blood to difficult-matching patients, and free fetal DNA extracted from maternal plasma. So that some measures must early be taken for clinical prevention and treatment to reduce immune hemolytic reactions. In this paper, the emergence of irregular antibodies, species, laboratory testing, pathogenesis, clinical symptoms and the current research are reviewed.
Anemia, Hemolytic, Autoimmune ; etiology ; immunology ; Erythroblastosis, Fetal ; etiology ; immunology ; Female ; Humans ; Infant, Newborn ; Isoantibodies ; adverse effects ; immunology ; Pregnancy ; Transfusion Reaction

The objective of study was to investigate the Rh antigen stability of mPEG-modified RBC. RBC membrane protein SDS-PAGE technology was used to analyze the combination of the mPEG modified RBC membrane protein with mPEG molecules; the RBC ghost coagulation test and 4 degrees C CPD-preserved modified RBC mixed with matched blood were used to observe the stability of RBC Rh antigen camouflaged by mPEG. The results showed that the blood groups of stored mPEG-modified RBC were kept consistency before or after simulating transfusion, i.e. mixture of modified RBC with matched bloods, while the plasma hemoglobin after simulating transfusion was not only within the normal range during the storage, but also less than that before simulating transfusion even after incubation at 37 degrees C. The electrophoresis pattern stained with iodine and Coomassie blue displayed the bands of mPEG combined with RBC membrane protein and the slow mobility of membrane protein. The hemagglutination of PEGylation RBC ghosts did not take place and mPEG still covered the antigen. In conclusion, mPEG-SPA can bind the erythrocyte with its extracted membrane protein in both ghosts and living erythrocytes.
Erythrocyte Membrane ; immunology ; Erythrocytes ; immunology ; Humans ; Isoantibodies ; blood ; Polyethylene Glycols ; pharmacology ; Rh-Hr Blood-Group System ; immunology ; Transfusion Reaction

No abstract available.
Aged ; False Positive Reactions ; *Histocompatibility Testing ; Humans ; Isoantibodies/immunology ; Keratoplasty, Penetrating ; Male ; Transplantation, Homologous

BACKGROUND: Although single antigen bead assays (SAB) are approved qualitative tests, the median fluorescence intensity (MFI) values obtained from SAB are frequently used in combination with quantitative significances for diagnostic purposes. To gauge the reproducibility of SAB results, we assessed the interlaboratory variability of MFI values using identical kits with reagents from the same lot and the manufacturer's protocol. METHODS: Six serum samples containing HLA-specific antibodies were analyzed at five laboratories by using Lifecodes LSA Class I and Class II SAB kits (Immucor, USA) from the same lot, according to the manufacturer's protocol. We analyzed the concordance of qualitative results according to distinct MFI cutoffs (1,000, 3,000, 5,000, and 10,000), and the correlation of quantitative MFI values obtained by the participating laboratories. The CV for MFI values were analyzed and grouped by mean MFI values from the five laboratories (<1,000; 1,000-2,999; 3,000-4,999; 5,000-9,999; and > or =10,000). RESULTS: The categorical results obtained from the five laboratories exhibited concordance rates of 96.0% and 97.2% for detection of HLA class I and class II antibodies, respectively. The Pearson correlation coefficients for MFI values of class I and class II antibodies were between 0.947-0.991 and 0.992-0.997, respectively. The median CVs for the MFI values among five laboratories in the lower MFI range (<1,000) were significantly higher than those for the other MFI ranges (all P<0.01). CONCLUSIONS: Analysis of SAB performed in five laboratories using identical protocols and reagents from the same lot resulted in high levels of concordance and strong correlation of results.
Analysis of Variance ; HLA Antigens/immunology ; Histocompatibility Testing ; Humans ; Isoantibodies/*blood ; Laboratories ; Reagent Kits, Diagnostic ; Reproducibility of Results

Antilymphocyte Serum ; HLA Antigens ; immunology ; Hematopoietic Stem Cell Transplantation ; Humans ; Isoantibodies ; Prognosis ; Transplantation, Homologous

Anti-H antibody belongs to IgM type cold antibody, which often induces the unconformity of positive and reverse typing and leads to the difficulty in clinical blood typing. Anti-H antibody was found during identification of the counter blood group in 3 cases. The antibody was found to be active at 37 degrees C, room temperature and 4 degrees C when determined by blood group serology, and was finally analyzed to be IgM. It is suggested that not to give erythrocytes of O group unreasoningly to blood recipient of AB group during emergent moment, but instead, to give same type of blood. If there was no same type of blood during urgent events, O type erythrocytes could be employed after being matched by saline centrifuging with host side coincidence and screened by incomplete method. In this case, anti-H antibody leading to adverse-reaction in blood transfusion should be prevented.
ABO Blood-Group System ; immunology ; Adult ; Blood Grouping and Crossmatching ; Female ; Humans ; Isoantibodies ; blood ; Male ; Middle Aged