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Thrombocytosis elevates serum potassium.

M Graber1, K Subramani, D Corish

  • 1VA Medical Center, Northport, NY.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|August 1, 1988
PubMed
Summary
This summary is machine-generated.

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Elevated serum potassium levels may be falsely high in individuals with increased platelet counts. This study found a direct correlation between platelet count and serum potassium, indicating a spurious elevation.

Area of Science:

  • Clinical Biochemistry
  • Hematology

Background:

  • Elevated serum potassium (hyperkalemia) can be falsely indicated by high platelet counts (>1,000 x 10^9/L), particularly in myeloproliferative disorders.
  • The relationship between more moderate increases in platelet counts and serum potassium levels requires further investigation.

Purpose of the Study:

  • To investigate the association between varying degrees of thrombocytosis (elevated platelet counts) and serum potassium levels.
  • To determine if serum potassium elevations occur at lower platelet count thresholds than previously established.

Main Methods:

  • Serum potassium and platelet counts were analyzed in 283 healthy controls and 161 patients with reactive thrombocytosis.
  • Patients were stratified based on platelet count ranges (e.g., <250 x 10^9/L, >500 x 10^9/L).

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  • Serum potassium was compared with plasma potassium to assess for spurious elevations.

    • Main Results:

    • Hyperkalemia occurred in 34% of patients with platelet counts >500 x 10^9/L, compared to 9% with counts <250 x 10^9/L.
    • A significant positive correlation was observed between platelet count and serum potassium levels across the studied range.
    • Higher potassium values were not attributable to leukocytosis, renal insufficiency, or acidosis.

    Conclusions:

    • Serum potassium levels increase proportionally with platelet count in both healthy individuals and those with thrombocytosis.
    • The observed rise in serum potassium is likely an artifactual elevation, not indicative of true hyperkalemia.
    • This finding has implications for the interpretation of potassium levels in patients with elevated platelet counts.