Hb level can determine the risk of anaemia, weakness, hypotension, type 2 myocardial Infarction risk, risk of needing blood transfusions, ability to work with physiotherapy, and length of hospital stay. Haddad et al. conducted a multivariate analysis of 626 patients [14]; the mean age was 76.27 ± 9.57 years (81.696-84.304; 95% CI). The gene discussed is GSTM1; the disease is anemia.