Test validation, method comparison and reference range for the measurement of ?-hydroxybutyrate in peripheral blood samples.

ABSTRACT: Introduction:The measurement of ?-hydroxybutyrate (?OHB) concentrations is a corner stone of the diagnosis of diabetic ketoacidosis and other ketonic states. The aim of this study was to perform a validation of a peripheral blood ?OHB assay (Randox) on a Roche cobas c502 analyser and to establish a ?OHB reference range for the validated assay. Materials and methods:Precision, linearity and limit of detection and blank (LoD, LoB) were determined according to Clinical and Laboratory Standards Institute (CLSI) EP05-A3, EP 06-A and EP17-A2 guidelines, using commercial control material and residual patient sample pools. As method comparison, for 190 semi-quantitative measurements of urine ketones we determined the corresponding ?OHB blood concentration. The reference range was based on the CLSI C28-A3 guideline, using 304 randomly selected serum samples from population based German National Cohort (GNC) study. Results:Coefficients of variation for the validated assay ranged from 1.5% for high concentrations (3.1 mmol/L) to 6.5% for low concentrations (0.1 mmol/L). Detection capacity was LoB = 0.011 mmol/L and LoD = 0.037 mmol/L. Linearity of the assay ranged from 0.10 to 3.95 mmol/L. The agreement between the semi-quantitative urine ketone test and the ?OHB blood test was moderate (Kappa = 0.66). The obtained 95% serum reference range was estimated as 0.02 to 0.28 mmol/l ?OHB. Conclusions:The Ranbut ?OHB assay showed good precision and analytical performance. Our results confirm that ?OHB measurement in peripheral blood is indeed a preferable alternative to the semi-quantitative measurement of urine ketones.

SUBMITTER: Kraus FB 

PROVIDER: S-EPMC6999181 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature