Figure 3.
Box and whisker plots of PF4/polyanion OD values and platelet counts over time. PF4/polyanion values were measured using the Stago (A) and Immucor (B) assays. The positivity cutoff for the Stago and Immucor assays comprised ODs of 0.238 and 0.4, respectively, with a normal platelet count of 150 to 400 × 109/L. Whiskers extend between the maximum and minimum values, and the middle line represents the median value with all data points displayed as dots. This graph includes only patients for whom serial PF4/polyanion and platelet counts were available, with some patients having multiple measurements in a given week (n = 18 and 22 patients for each graph, respectively).