Fig. 1. Line and scatter plots of stability test Fig. 1. Line and scatter plots of stability test. X axis means elapsed time and Y axis means the average of % biases compared with the result of first measurement (0 hr) of each tube. The dashed lines mean upper and lower limits of desirable bias. (A) whole blood count (WBC), (B) hemoglobin (Hb), (C) platelet (PLT), (D) reticulocyte, (E) hemoglobin A1c (HbA1c), (F) brain natriuretic peptide (BNP), (G) prothrombin time (PT), (H) activated partial thrombin time (aPTT). Lab Med Online. 2015 Apr;5(2):92-100. http://dx.doi.org/10.3343/lmo.2015.5.2.92