title: Prevalence of hypovitaminosis D in early infantile hypocalcemia.
abstract: OBJECTIVE
  To further define the pathogenesis of infantile hypocalcemia, the prevailing vitamin D status, and treatment outcomes.
  
  
  RESULTS
  Of the 23 infants admitted with infantile hypocalcemia, 21 had biochemical evidence of hypocalcemia and hyperphosphatemia and the other two had isolated hypocalcemia. The majority of these infants had relatively low serum intact parathyroid hormone responses against the backdrop of hypocalcemia. Thirteen (56.5%) of these infants had low 25-hydroxyvitamin D (25-OHD) levels, of whom 69% were Hispanic and 23% were African American. Infantile serum vitamin D status reflected that of the mother in all the 16 instances in which it was measured. Treatment with calcitriol hastened recovery from hypocalcemia in our series.
  
  
  CONCLUSIONS
  Relative hypoparathyroidism is the etiology in the majority of cases of late onset and early infantile hypocalcemia. We identified vitamin D deficiency in a significant percentage of infants with hypocalcemia, especially Hispanics and African Americans. Maternal 25-OHD concentrations should be ascertained if the infant has low 25-OHD levels.
authors.affiliation: Department of Pediatrics/Division of Pediatric Endocrinology and Metabolism, The Children's Hospital, University ofAlabama at Birmingham, 35233, USA. AAshraf@peds.uab.edu
authors.forename: Ambika
authors.initials: A
authors.lastname: Ashraf
authors.forename: Gail
authors.initials: G
authors.lastname: Mick
authors.forename: Joycelyn
authors.initials: J
authors.lastname: Atchison
authors.forename: Bragan
authors.initials: B
authors.lastname: Petrey
authors.forename: Hussein
authors.initials: H
authors.lastname: Abdullatif
authors.forename: Kenneth
authors.initials: K
authors.lastname: McCormick
mesh_terms: D000328:Adult; D001741:Black or African American; D000407:Alabama / Q000453:epidemiology; D005260:Female; D006630:Hispanic or Latino; D006801:Humans; D006996:Hypocalcemia / Q000150:complications*; D007011:Hypoparathyroidism / Q000150:complications; D007223:Infant; D007228:Infant Nutrition Disorders / Q000150:complications; D007231:Infant, Newborn; D008297:Male; D015995:Prevalence; D014807:Vitamin D / Q000031:analogs & derivatives / Q000097:blood; D014808:Vitamin D Deficiency / Q000453:epidemiology* / Q000209:etiology; D044465:White People
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D