Interlaboratory comparison of the Doumas bilirubin reference method.

Objectives: To assess the performance of the Doumas bilirubin reference method.

Design And Methods: Ring trails using pooled patient specimens, a calibrator and human sera enriched with unconjugated bilirubin were analyzed in five laboratories using the Doumas bilirubin reference method.

Results: The coefficient of variation for the linear measurement range between laboratories ranged from 1-3%.