Pseudohypoparathyroidism laboratory findings

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mazia Fatima, MBBS [2]

Overview

The diagnosis of pseudohypoparathyroidism is made by measurement of variations in serum calcium, phosphorus, cAMP and calcitriol and in urinary cAMP and phosphorus excretion helps in assessment of skeletal and renal responsiveness to parathyroid hormone.

Laboratory Findings

The diagnosis of pseudohypoparathyroidism is made by measurement of variations in serum calcium, phosphorus, cAMP and calcitriol and in urinary cAMP and phosphorus excretion helps in assessment of skeletal and renal responsiveness to parathyroid hormone ^[1]
Laboratory findings consistent with the diagnosis of pseudohypoparathyroidism include
- Hypocalcemia
- Hyperphosphatemia
- Elevated serum concentration of parathyroid hormone
- Diminished urinary cAMP response after administration of the biosynthetic N-terminal fragment of parathyroid hormone
- Secondary hyperparathyroidism and hyperparathyroid bone disease due to the parathyroid hormone resistance

Immunoradiometric assay (IRMA) can be used to measure serum parathyroid hormone concentration
Assessment of thyroid function tests, gonadotropin, testosterone, estrogen and insulin like growth factor will help in identification of any associated underlying hormonal dysfunction

References

↑ Shalitin S, Davidovits M, Lazar L, Weintrob N (2008). “Clinical heterogeneity of pseudohypoparathyroidism: from hyper- to hypocalcemia”. Horm. Res. 70 (3): 137–44. doi:10.1159/000137658. PMID 18663313.

Template:WikiDoc Sources

[pmid18663313-1] Shalitin S, Davidovits M, Lazar L, Weintrob N (2008). “Clinical heterogeneity of pseudohypoparathyroidism: from hyper- to hypocalcemia”. Horm. Res. 70 (3): 137–44. doi:10.1159/000137658. PMID 18663313.

[1]