<prompt> Which one of the following biochemical measures would be most likely to be elevated in this patient?Alkaline phosphataseCalciumFerritinPhosphorus  <response>: 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. 