When dividing COVID-19 patients according to GGT activity level (<50 IU/L and ≥50 IU/L), the patients with elevated GGT activity presented significantly decreased concentrations of fetuin-A (221.9 (182.1–256.3) vs. 258.8 (219.9–310.9) μg/mL; p = 0.004, respectively). This evidence concerns the gene AHSG and COVID-19.