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ROC Analysis using laboratory parameters in the diagnosis of severe cases of COVID-19. The positive sample is the test results of severe and very severe cases while the negative sample is the results of mild to moderate cases. (A) ROC plot of biochemical markers (LDH, ferritin, IL-6, procalcitonin, hs-CRP), (B) ROC plot of NLR, PLR and MLR and (C) ROC plot of coagulation parameters (D-dimer, fibrin degradation products (FDP), fibrinogen).
