PRL and COVID-19: However, there were significant higher serum T (0.38/0.39 vs. 0.22 ng/ml, P < 0.001/ < 0.001) and PRL (25.43/24.10 vs. 12.12 ng/ml, P < 0.001/ < 0.001) levels in both basal and all-COVID-19 groups (Figures 3C,D, Supplementary Table 2).