Fig 2.

Average d-dimer for patients with coronavirus disease 2019 (COVID-19) with acute deep venous thrombosis (DVT), suggesting that there is a peak in d-dimer level immediately preceding duplex diagnosis of a DVT. The trend is graphed over time with day 0 as the day of the duplex. Negative values represent the days prior, and positive values days after the ultrasound examination. Error bars represent standard error of the mean. The number of patients with a d-dimer value at each time point are listed below the graph in the table.