The analysis of 35 selected blood parameters revealed that in the COVID-19 positive group, the calculated parameter medians were within the normal reference range for all except two parameters that were elevated: prothrombin activity % (median: 1.05; normal range (SI): 0.7–1), and CRP (median: 12 mg/L; SI: 0–5 mg/L). This evidence concerns the gene F2 and COVID-19.