Serum osteocalcin was a good marker for hyperglycemia, as it inversely correlated with glycemia at admission in the ICU (r = −0.476, p = 0.001) and at days 2 (r = −0.409, p = 0.007) and 3 (r = −0.351, p = 0.049). This evidence concerns the gene BGLAP and Hyperglycemia.