Endogenous factors modified by hemodialysis may interfere with the accuracy of blood glucose-measuring device

In Japan, self-monitoring of blood glucose (SMBG) devices are widely used both at home and in hospitals, but many analytical errors and safety concerns have been reported about the SMBG devices used in hospitals. Analytical performances of StatStrip (Nova Biomedical Corporation, MA, USA), a new point-of-care testing device and Glutest (Sanwa Chemical, Aichi, Japan), a routinely used SMBG device were compared in glucose measurement of pre- and postdialysis blood samples and we evaluated which factors in blood modified by hemodialysis affect accuracy of these devices. Subjects in this study were 44 hemodialysis patients. Blood samples were obtained from patients just before and just after the hemodialysis. Blood glucose concentrations of samples were measured by StatStrip and Glutest. Hematocrit and plasma concentrations of electrolytes, metabolites, etc. of the samples were measured in the central laboratory. StatStrip showed no difference between pre- and postdialysis blood samples and showed very little bias from reference method. On the other hand, Glutest showed difference between pre- and postdialysis samples. Although there is no problem in the data of predialysis blood samples by Glutest, however, these of the postdialysis blood samples by Glutest were >10% less than reference method. Factors in blood modified by hemodialysis such as hematocrit, uric acid, albumin, potassium, and calcium affected glucose readings by Glutest. Glucose readings by Glutest of samples from hemodialysis patients were affected by hematocrit and several factors, which were modified by hemodialysis. StatStrip is considered as a better device in dialysis hospitals.