According to the Global Consensus Recommendations on Prevention and Management of Nutritional Rickets and the Institute of Medicine (IOM), vitamin D deficiency is classified into two groups of deficient and Insufficient based on serum 25(OH)D level. It could be further classified as mild, moderate, and severe deficiency. Another<unk>  scheme is based on etiology of vitamin D deficiency which classify it as acquired or inherited.
Vitamin D deficiency classification
Hyperparathyroidism classification
Osteoporosis classification
Osteoporosis classification scheme
Vitamin D deficiency epidemiology and demographics
Hypoparathyroidism diagnostic criteria
Vitamin D deficiency physical examination
Hypocalcemia classification