Fig. 2From: Measurement of hydroxychloroquine in blood from SLE patients using LC-HRMS—evaluation of whole blood, plasma, and serum as sample matricesReproducibility testing. In order to evaluate the reproducibility of the method in the three matrices, eight patient samples were processed and analyzed on two occasions. a, b, and c shows the results for whole blood, serum, and plasma, respectively. Reproducibility was high in WB, intermediate in serum, and low in plasmaBack to article page