title: Serum 25-hydroxyvitamin D in infantile rickets.
abstract: In small children with nutritional vitamin D deficiency, the serum concentration of 25-hydroxyvitamin D (25-OH-D), the major circulating metabolite of vitamin D, was correlated with the stage of clinical disease. It was low (16 to 20 ng/ml) but within the normal range in the earliest (hypocalcemic) stage of the deficiency syndrome and decreased (less than 15 ng/ml) in the more advanced stages. In patients with familial hypophosphatemia (X-linked dominant), mean serum 25-OH-D concentration was the same as in age-matched normal controls. Evidence is presented that endogenous parathyroid hormone may have a role in the depletion of serum 25-OH0D in deficiency states.
mesh_terms: D000293:Adolescent; D000469:Alkaline Phosphatase / Q000097:blood; D002118:Calcium / Q000097:blood; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D007015:Hypophosphatemia, Familial / Q000097:blood / Q000150:complications / Q000201:enzymology; D007223:Infant; D008297:Male; D010281:Parathyroid Hormone / Q000097:blood; D010758:Phosphorus / Q000097:blood; D012279:Rickets / Q000097:blood* / Q000201:enzymology; D014808:Vitamin D Deficiency / Q000150:complications
chemical_list: D006887:Hydroxycholecalciferols; D010281:Parathyroid Hormone; D010758:Phosphorus; D000469:Alkaline Phosphatase; D002118:Calcium