Considering that there is no consensus on the definition of the functional MBL deficiency, we initially used three different cut-off values of MBL concentration (150 ng/mL, 400 ng/mL, and 700 ng/mL) (Table 2), according to the recent literature data [5, 8]. The gene discussed is MBL2; the disease is hyperinsulinemic hypoglycemia, familial, 4.