TY - JOUR
T1 - Optimization of preanalytical conditions and analysis of plasma glucose. 1. Impact of the new WHO and ADA recommendations on diagnosis of diabetes mellitus
AU - Stahl, M.
AU - Jørgensen, L. G.M.
AU - Hyltoft Petersen, P.
AU - Brandslund, I.
AU - De Fine Olivarius, N.
AU - Borch-Johnsen, K.
PY - 2001/5/20
Y1 - 2001/5/20
N2 - The new diagnostic criteria for type 2 diabetes from the American Diabetes Association (ADA) and World Health Organization (WHO) recommend measurements on plasma and a lowering of the glucose threshold for diabetes by 0.8 mmol/L. This narrows the distance between the upper end of the reference limit and the discriminatory level to a degree where analytical quality becomes critical. The quality demands for the preanalytical and analytical phase and their consequences on diagnostic performance have to be established in the new technical system, measuring in plasma rather than in capillary whole blood. Because of the instability of glucose in blood samples it is necessary to clarify the influence of different preanalytical and analytical factors on the number of false-positive and false-negative classifications. Thus the aim of the present study was to find optimal conditions for sampling, additives, storage, transport and analysis of plasma glucose combining feasibility with an analytical bias close to zero and a within-imprecision around 1%. We have documented the analytical performance of the method itself and its traceability to an international standard. The preanalytical conditions, such as influence of antiglycolytic agent NaF, conditions for plasma separation, storage temperature and storage time before and after plasma separation were investigated. In conclusion, we recommend that blood should be drawn in tubes containing heparin and NaF and kept on ice water for not more than 1 h until centrifugation at minimum 1000 × g for 10 min. The plasma is then stable for at least 48 h at room temperature.
AB - The new diagnostic criteria for type 2 diabetes from the American Diabetes Association (ADA) and World Health Organization (WHO) recommend measurements on plasma and a lowering of the glucose threshold for diabetes by 0.8 mmol/L. This narrows the distance between the upper end of the reference limit and the discriminatory level to a degree where analytical quality becomes critical. The quality demands for the preanalytical and analytical phase and their consequences on diagnostic performance have to be established in the new technical system, measuring in plasma rather than in capillary whole blood. Because of the instability of glucose in blood samples it is necessary to clarify the influence of different preanalytical and analytical factors on the number of false-positive and false-negative classifications. Thus the aim of the present study was to find optimal conditions for sampling, additives, storage, transport and analysis of plasma glucose combining feasibility with an analytical bias close to zero and a within-imprecision around 1%. We have documented the analytical performance of the method itself and its traceability to an international standard. The preanalytical conditions, such as influence of antiglycolytic agent NaF, conditions for plasma separation, storage temperature and storage time before and after plasma separation were investigated. In conclusion, we recommend that blood should be drawn in tubes containing heparin and NaF and kept on ice water for not more than 1 h until centrifugation at minimum 1000 × g for 10 min. The plasma is then stable for at least 48 h at room temperature.
KW - Analytical bias
KW - Analytical imprecision
KW - Diabetes mellitus
KW - P-glucose measurements
KW - P-glucose recommendation
KW - Preanalytical factors
UR - http://www.scopus.com/inward/record.url?scp=17744400689&partnerID=8YFLogxK
U2 - 10.1080/003655101300133612
DO - 10.1080/003655101300133612
M3 - Article
C2 - 11386604
AN - SCOPUS:17744400689
SN - 0036-5513
VL - 61
SP - 169
EP - 179
JO - Scandinavian Journal of Clinical and Laboratory Investigation
JF - Scandinavian Journal of Clinical and Laboratory Investigation
IS - 3
ER -