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BACKGROUND AND AIMS: COVID-19 is a multi-system disease, with coagulation abnormalities. D-dimer levels are increased in this disease. We aimed to determine the association of D-dimer levels and mortality and to establish its optimal cut off values in predicting mortality. Association of D-dimer levels with diabetes mellitus has also been established. METHODS: Information on 483 patients with confirmed COVID-19 was retrospectively collected and analyzed. The optimal D-dimer cutoff point and C-statistic of routine tests both on admission and during hospital stay were evaluated by receiver operator characteristic (ROC) curve. RESULTS: D-dimer elevation (≥0.50 µg/mL) was seen in 80.1% of the hospitalized patients. D-dimer level ≥2.01 µg/mL was a significant predictor of subsequent deaths (P < 0.01; HR, 3.165; 95% CI, 2.013-4.977). High D-dimer values (≥0.50 µg/mL) were observed in 72 of the 75 (96%) cases with a fatal outcome. Median D-dimer value among non-survivors was 6.34 µg/mL and among survivors it was 0.94 µg/mL. A higher proportion of fatal outcomes occurred in patients with underlying disease (89.0%), most prominent of which was diabetes mellitus (66%). The median D-dimer value was found to be significantly high in diabetic patients (1.68 µg/mL). CONCLUSIONS: Among the measured coagulation parameters, D-dimer during hospital stay had the highest C-index to predict in-hospital mortality in COVID-19 patients. D-dimer value ≥ 2.01 µg/mL can effectively predict in-hospital mortality in patients with COVID-19. A significant association of increased D-dimer level has been found with diabetes mellitus and elderly age.
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D-dimer level is a useful predictor for mortality in patients with COVID-19: Analysis of 483 cases
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