Am J Perinatol 2017; 34(12): 1199-1204
DOI: 10.1055/s-0037-1602419
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Comparison of Intact Parathyroid Hormone, Alkaline Phosphatase, Phosphate Levels for Diagnosing Severe Metabolic Bone Disease in Infants with Severe Bronchopulmonary Dysplasia

Erin K. Tkach
1   Division of Neonatology, Department of Pediatrics, University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
,
Ammie M. White
2   Division of Radiology, Department of Pediatrics, University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
,
Kevin C. Dysart
1   Division of Neonatology, Department of Pediatrics, University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
,
Brenda Waber
1   Division of Neonatology, Department of Pediatrics, University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
,
Ursula S. Nawab
1   Division of Neonatology, Department of Pediatrics, University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
,
Huayan Zhang
1   Division of Neonatology, Department of Pediatrics, University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
,
Erik A. Jensen
1   Division of Neonatology, Department of Pediatrics, University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
› Author Affiliations
Further Information

Publication History

17 January 2017

23 March 2017

Publication Date:
21 April 2017 (online)

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Abstract

Objective We compared the accuracy of serum intact parathyroid hormone (iPTH), alkaline phosphatase (ALP), and phosphate (phos) levels for diagnosing severe metabolic bone disease (MBD) in very low-birth-weight (VLBW) infants with severe bronchopulmonary dysplasia (BPD).

Study Design Retrospective analysis of VLBW infants with severe BPD admitted between 2010 and 2012 and with ≥ 1 iPTH, ALP, and phos level collected within a similar 72-hour period. MBD severity was classified by serial radiography.

Results Laboratory values were available for 65 infants, of whom 24 (36.9%) developed severe MBD. A maximum ALP > 660 IU/L was the most accurate for diagnosing severe MBD (area under the curve: 88.4%; 95% confidence interval [CI]: 77.2–94.5%). Maximum iPTH was the least accurate (optimal cut point > 130 pg/mL; area under the curve: 70.5%; 95% CI: 58.2–81.4).

Conclusion Maximum ALP was more accurate than iPTH or phos for diagnosing severe MBD among preterm infants with severe BPD.