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Related Experiment Videos

Chloride/phosphate ratio in primary hyperparathyroidism.

J C Boughey1, C J Ewart, M J Yost

  • 1Department of Surgery, University of South Carolina, School of Medicine, Columbia, South Carolina 29203, USA.

The American Surgeon
|February 18, 2004
PubMed
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The chloride/phosphate (Cl:PO4) ratio can help diagnose primary hyperparathyroidism (HPT). A Cl:PO4 ratio of 33 or higher reliably indicates HPT, offering a cost-effective diagnostic alternative.

Area of Science:

  • Endocrinology
  • Clinical Biochemistry
  • Nephrology

Background:

  • Hypercalcemia is a common clinical finding.
  • Distinguishing primary hyperparathyroidism (HPT) from other causes of hypercalcemia is crucial for appropriate management.
  • The chloride/phosphate (Cl:PO4) ratio has been proposed as a diagnostic marker.

Purpose of the Study:

  • To evaluate the diagnostic utility of the Cl:PO4 ratio in confirming primary HPT.
  • To compare the Cl:PO4 ratio in patients with primary HPT versus healthy controls.
  • To assess the Cl:PO4 ratio's effectiveness in specific patient subgroups, including those with renal insufficiency or borderline hypercalcemia.

Main Methods:

  • A comparative study design was employed.
  • The Cl:PO4 ratio was measured in 106 patients with surgically confirmed primary HPT and 126 normocalcemic healthy outpatients.

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  • Statistical analysis was performed to compare the ratios between groups and within subgroups.

    • Main Results:

    • Patients with primary HPT exhibited a significantly higher Cl:PO4 ratio (42.5 ± 7.0) compared to healthy controls (28.7 ± 4.6).
    • A Cl:PO4 ratio ≥ 33 was identified as a reliable diagnostic threshold for primary HPT.
    • Elevated Cl:PO4 ratios were observed in HPT patients with mild renal insufficiency and borderline hypercalcemia.

    Conclusions:

    • The Cl:PO4 ratio serves as a valuable and reliable diagnostic test for primary HPT.
    • This ratio is particularly useful in patients with suspected HPT, mild renal impairment, or borderline elevated serum calcium.
    • The Cl:PO4 ratio may offer a cost-effective alternative to serum parathormone assays for confirming primary HPT, especially when combined with imaging studies prior to surgery.