Analysis of Polycheck Allergy Results of the Recent Two Years: Comparison with Skin Prick Test and ImmunoCAP

BACKGROUND: Multiple Antigen Simultaneous Test (MAST)-immunoblot assay is a practical and economical test, which has been recently introduced nationwide. Authors investigated test efficiency of a MAST-immunoblot assay, Polycheck Allergy (PA). METHODS: A total of 3,153 patients were tested by PA and the results were compared with the results of ImmunoCAP and skin prick test (SPT) in 532 and 75 patients, respectively. The correlation with the lgE results measured by VIDAS was also analyzed. RESULTS: The agreements of PA with SPT were 87.8% in the Inhalant Panel and 89.3% in the Food Panel and the agreement of ImmunoCAP with SPT was 95.2%. The most common allergens giving positive reactions were Dermatophagoides farinae (46.2%) and Dermatophagoides pteronyssinus (40.0%). SPT taken as a reference, PA compared with ImmunoCAP showed higher agreement (D. farinae, 76.0 vs. 70.7%; D. pteronyssinus, 76.0 vs. 74.4%), sensitivity (D. farinae, 72.7 vs. 68.2%; D. pteronyssinus, 75.0 vs. 71.2%) and specificity (D. farinae, 85.0 vs. 81.3%) except for the specificity for D. pteronyssinus (78.3 vs. 87.5%). The rate of allergen specific IgE positive patients was higher than that of negative patients when total IgE was over 100 kU/L. CONCLUSIONS: Our results showed that the agreement, sensitivity and specificity of PA were similar to or better than those of the previously established test, ImmunoCAP. The allergen specific IgE results of PA were in correlation with total IgE. PA may be used for testing allergen specific IgE to diagnose and treat allergic diseases.

Analysis of Polycheck Allergy Results of the Recent Two Years: Comparison with Skin Prick Test and ImmunoCAP

BACKGROUND: Multiple Antigen Simultaneous Test (MAST)-immunoblot assay is a practical and economical test, which has been recently introduced nationwide. Authors investigated test efficiency of a MAST-immunoblot assay, Polycheck Allergy (PA). METHODS: A total of 3,153 patients were tested by PA and the results were compared with the results of ImmunoCAP and skin prick test (SPT) in 532 and 75 patients, respectively. The correlation with the lgE results measured by VIDAS was also analyzed. RESULTS: The agreements of PA with SPT were 87.8% in the Inhalant Panel and 89.3% in the Food Panel and the agreement of ImmunoCAP with SPT was 95.2%. The most common allergens giving positive reactions were Dermatophagoides farinae (46.2%) and Dermatophagoides pteronyssinus (40.0%). SPT taken as a reference, PA compared with ImmunoCAP showed higher agreement (D. farinae, 76.0 vs. 70.7%; D. pteronyssinus, 76.0 vs. 74.4%), sensitivity (D. farinae, 72.7 vs. 68.2%; D. pteronyssinus, 75.0 vs. 71.2%) and specificity (D. farinae, 85.0 vs. 81.3%) except for the specificity for D. pteronyssinus (78.3 vs. 87.5%). The rate of allergen specific IgE positive patients was higher than that of negative patients when total IgE was over 100 kU/L. CONCLUSIONS: Our results showed that the agreement, sensitivity and specificity of PA were similar to or better than those of the previously established test, ImmunoCAP. The allergen specific IgE results of PA were in correlation with total IgE. PA may be used for testing allergen specific IgE to diagnose and treat allergic diseases.

Rapid Identification of Thrombocytopenia-Associated Multiple Organ Failure Using Red Blood Cell Parameters and a Volume/Hemoglobin Concentration Cytogram

Thrombocytopenia-associated multiple organ failure (TAMOF) has a high mortality rate when not treated, and early detection of TAMOF is very important diagnostically and therapeutically. We describe herein our experience of early detection of TAMOF, using an automated hematology analyzer. From 498,390 inpatients, we selected 12 patients suspected of having peripheral schistocytosis, based on the results of red blood cell (RBC) parameters and a volume/hemoglobin concentration (V/HC) cytogram. We promptly evaluated whether the individual patients had clinical manifestations and laboratory findings were consistent with TAMOF. Plasma exchanges were then performed for each patient. All 12 patients had TAMOF. The mean values of RBC parameters were significantly higher in all of the patients than with the reference range, however, 3 patients had % RBC fragments within the reference range. The mean value of ADAMTS-13 activity was slightly lower in patients compared with the reference range. Of the 12 patients, remission was obtained in 9 patients (75%) within 4 to 5 weeks using plasma exchanges. Three patients died. An increased percentage of microcytic hyperchromic cells with anisocytosis and anisochromia indicated the presence of schistocytes, making it an excellent screening marker for TAMOF. Identification of TAMOF with RBC parameters and a V/HC cytogram is a facile and rapid method along with an automated hematology analyzer already in use for routine complete blood cell counting test.

Evaluation of Alterations in Homocysteine Levels According to the Delayed Initiation Time of Centrifugation / 임상검사와정도관리

BACKGROUND: The aim of this study was to investigate alterations in homocysteine levels with delays in the initiation time of centrifugation. Attempts were made to improve the processing of samples by analyzing the homocysteine levels of patients from a health promotion center, where delays in the initiation of sample centrifugation were expected because of the nature of the workload and operational procedures. METHODS: Forty healthy adults were selected for the measurement of homocysteine levels. The two samples those were obtained from each individual simultaneously and separately were designated as group A (centrifugation initiation time or =2 hours). The degree of deviation from the homocysteine reference interval was also evaluated with samples from 1,134 adults who had medical check-up at a health promotion center from August 1, 2009 to July 31, 2010. RESULTS: The mean serum homocysteine level in group B was significantly higher than that of group A (12.4 vs. 10.6 micromol/L, P<0.0001). Homocysteine level increased with a mean of 19.4% when the initiation of centrifugation was delayed over 2 hours. In the 1,134 adults who had medical check-up, the numbers outside the reference interval were 334 (29.5%). Abnormal samples with homocysteine levels out of the reference interval were reduced to about 7% in July 2011 through improving sample processing to minimize delays in centrifugation initiation time. CONCLUSIONS: Homocysteine levels rapidly increase as blood sample centrifugation is delayed. Therefore, in order to provide accurate test results immediate centrifugation of blood samples is critical.

A Case of Cold Agglutinin Disease Accompanied by Bacterial Pneumonia That Was Treated with Rituximab / 대한수혈학회지

Cold agglutinin disease (CAD) is a small group of disorders that is characterized by cold-reactive autoantibodies that bind to erythrocyte carbohydrate antigens, and this causes hemagglutination and complement-mediated hemolysis. Autoimmune hemolytic anemia (AIHA) is an immune disorder that is mediated via auto-antibodies produced by lymphoid B cells against red blood cells. The disorder may be a primary (idiopathic) or secondary disease with an underlying autoimmune disease, a lymphoproliferative disorder or infection. The mainstay of initial treatment is immunosuppression with glucocorticosteroids. For those who do not have satisfactory response to initial glucocorticosteroids or they have a relapse after initially successful treatment, splenectomy or other immunosuppressive agents such as azathioprine, cyclosporine and intravenous immunoglobulin (IVIG) could be the next available options. More recently, rituximab, which is a human-murine chimeric monoclonal antibody specific for the CD20 antigen found on the surface of B lymphocytes, is also available. We report here on the successful use of rituximab for the treatment of a Korean elderly patient with CAD and the patient presented with recurrent AIHA.

Influence of Waist Circumference Index of Metabolic Syndrome on the Establishment of Reference Intervals / 임상검사와정도관리

BACKGROUND: Metabolic syndrome is a combination of disorders that increase the risk of cardiovascular disease and type 2 diabetes. The aim of this study was to evaluate the influence of waist circumference index of metabolic syndrome on the establishment of reference intervals. METHODS: We selected 2,442 adults (1,324 men and 1,118 women) samples who took medical check-up at our hospital health promotion center from January 1, 2008 to May 20, 2008. Study groups were divided into two subgroups by waist circumference. The data was statistically analyzed using SAS 8.2 for Gaussian distribution and t-test. RESULTS: Leukocyte counts, erythrocyte counts, platelet counts, and hs-CRP showed difference in reference intervals, but no significant differences were observed between the two groups (P>0.05). In most of routine chemistry items, reference intervals were significantly different between the two groups (P<0.05). CONCLUSIONS: Because waist circumference is measured exactly by physician, use of waist circumference for prior sampling in setting of reference intervals would be very useful for selection of healthy person.