Fig. 1From: Measurement of hydroxychloroquine in blood from SLE patients using LC-HRMS—evaluation of whole blood, plasma, and serum as sample matricesComparison of HCQ measurements in three matrices for the same samples. a Whole blood versus serum. b Whole blood versus plasma. c Serum versus plasma. The markers indicate prescribed dosage of HCQ: circle = 1400 mg/week, triangle = 2000 mg/week, and diamond = 2800 mg/weekBack to article page