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Hypercalcemia and parathyroid disorders.

D B Endres1

  • 1University of Southern California, School of Medicine, Los Angeles.

Current Opinion in Rheumatology
|June 1, 1992
PubMed
Summary
This summary is machine-generated.

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Diagnosing hypercalcemia involves measuring intact parathyroid hormone (PTH). High PTH suggests primary hyperparathyroidism, while low PTH indicates hypercalcemia of malignancy, often due to parathyroid hormone-related protein.

Area of Science:

  • Endocrinology
  • Clinical Chemistry

Background:

  • Hypercalcemia is commonly caused by primary hyperparathyroidism and malignancy.
  • Accurate diagnosis is crucial for appropriate patient management.

Purpose of the Study:

  • To differentiate between primary hyperparathyroidism and malignancy as causes of hypercalcemia.
  • To evaluate the utility of intact parathyroid hormone (PTH) and parathyroid hormone-related protein (PTHrP) assays.

Main Methods:

  • Measurement of ionized calcium.
  • Determination of intact PTH using two-site immunoassays.
  • Assessment of PTHrP levels in cases of suspected humoral hypercalcemia of malignancy.

Main Results:

  • Intact PTH is elevated in primary hyperparathyroidism and suppressed in malignancy-associated hypercalcemia.

Related Experiment Videos

  • PTHrP is elevated in most cases of humoral hypercalcemia of malignancy.
  • Older PTH assays are less effective than intact PTH assays.

    • Conclusions:

    • Intact PTH measurement is the most valuable laboratory test for diagnosing hypercalcemia.
    • PTHrP plays a significant role in humoral hypercalcemia of malignancy.
    • Further research on PTHrP will aid in diagnosis and therapy.