Which one of the following biochemical measures would be most likely to be elevated in this patient?

Answer A. Alkaline phosphataseThe patient has genu varum and enlarged wrists consistent with nutritional rickets. Alkaline phosphatase usually is increased markedly over the age-specific reference range in rickets. Serum phosphorus and vitamin D concentrations are usually low; serum calcium concentration is decreased only in hypocalcemic rickets. Ferritin is not usually elevated in these patients.