PTH and nutritional deficiency disease: In order to properly tackle the consequent risk of malnutrition, a pre-surgery nutritional status assessment is highly recommended, including biomarkers such as serum iron, folate, ferritin, and total iron-binding capacity (TIBC); thiamin (B1); vitamin B12 and B6; calcium, Parathyroid Hormone (PTH), alkaline phosphatase, vitamin D, phosphorus, calcium, magnesium, potassium and zinc [77].