Accuracy of Capillary Blood Glucose Test When Fasting in Diabetes Patients or General Population: Performance Evaluation of G300 Based on ISO 15197:2013 Standards

BACKGROUND: Self-monitoring of blood glucose plays an important role in management of diabetes mellitus. Blood glucose measurement is based on using plasma glucose separated from whole blood, but many people with diabetes and health care providers use a portable glucose meter for convenience. The aim of this study was to evaluate the accuracy and agreement of G300 portable glucose monitoring system against standard venous glucose testing methods, based on ISO 15197:2013 standards. METHODS: This study was the evaluation of G300 system accuracy following ISO 15197:2013 standards. We estimated precision, system accuracy, hematocrit interference, interfering substances, and user performance. RESULTS: In repeatability precision evaluation of those glucometers, standard deviation was 2.9–3.7 mg/dL at glucose levels under 100 mg/dL and coefficient of variation was 1.7–3.2% at glucose levels over 100 mg/dL, respectively. In accuracy evaluation, 99.5% of difference values between results of G300 portable glucose monitoring system and clinical laboratory were within 95%. Consensus Error grid analysis showed that all values (100%) are within zone A. Hematocrit range between 20% and 60% did not cause interference. These results were acceptable for the ISO15197:2013 criteria in all glucose concentrations. CONCLUSIONS: This study showed that G300 can provide reliable blood glucose results for patients and health care providers to manage diabetes mellitus, satisfying the ISO 15197:2013 criteria.

Transfusion Strategy and Laboratory Update on the DEL Variant / 대한수혈학회지

Red cells that express extremely low levels of D antigen that cannot be detected by routine serologic tests are designated as DEL. Most DEL blood donors are typed as D-negative. However, DEL red blood cells can be recognized by serological adsorption and elution test or molecular RHD genotyping. Anti-D production in patients with D-negative who received transfusion containing DEL blood has reported, therefore distinction between DEL variant and true D- negative is clinically important. This review highlights a transfusion strategy and laboratory update on the DEL variant in the Korean population.