ROC curve of D-dimer for predicting arterial or venous thrombosis. This ROC curve shows the performance (sensitivity and specificity) of various D-dimer cutoffs in predicting arterial or venous thrombosis during the 100 days after diagnosis of ALL. Each data point in the ROC curve represents a different D-dimer level (micrograms per milliliter) taken adjacent to the diagnosis of ALL (ie, study index).