On the other hand, serum GDF-15 levels (OR 1.037, 95% CI 1.022–1.054, p < 0.001) and leukocyte count (OR 1.077, 95% CI 1.003–1.157, p =0.008) were the significant positive predictors for a fatal COVID-19 outcome. The gene discussed is GDF15; the disease is COVID-19.