GSTM1 and COVID-19: As for the possible predictive value of laboratory markers, PPV data also showed that striking changes in the presence of blood basophils could indicate plain Omicron COVID-19 morbidity and mortality, whereas blood values inside normality ranges for azotemia, Hb (for both men and women), Hct, MCV, MCHC, RDW monocytes, basophils, WBC, neutrophils and PLT represent non-severe Omicron COVID-19 morbidity [25].