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Erythrocyte zinc protoporphyrin.

J Braun1

  • 1Department of Medicine IV, University of Erlangen-Nürnberg, Nürnberg, Germany.

Kidney International. Supplement
|March 20, 1999
PubMed
Summary

Zinc protoporphyrin (ZPP) indicates iron deficiency in red blood cell formation. While useful for diagnosing absolute iron deficiency, ZPP may not reliably predict response to iron therapy in kidney disease patients.

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Area of Science:

  • Biochemistry
  • Hematology
  • Clinical Chemistry

Background:

  • Zinc protoporphyrin (ZPP) forms when ferrochelatase incorporates zinc instead of iron into protoporphyrin IX.
  • ZPP levels correlate inversely with serum ferritin in healthy individuals.
  • Two types of iron deficiency exist: absolute and relative (functional).

Purpose of the Study:

  • To evaluate ZPP as an indicator of iron deficiency, particularly functional iron deficiency.
  • To assess the utility of ZPP in predicting iron supplementation response in renal failure patients.

Main Methods:

  • Analysis of ZPP levels in relation to iron status markers.
  • Comparison of ZPP with serum ferritin and transferrin saturation.
  • Observation of ZPP response to iron supplementation in hemodialysis patients.

Main Results:

  • ZPP is a strong indicator of absolute iron deficiency and iron-deficient erythropoiesis.
  • Serum ferritin and transferrin saturation may underestimate functional iron deficiency.
  • Elevated ZPP in renal failure can stem from inflammation, lead, or uremic factors.
  • ZPP levels do not consistently predict erythropoietic response to iron in hemodialysis patients.
  • ZPP cannot detect iron overload during intravenous iron therapy.

Conclusions:

  • ZPP is a valuable marker for iron-deficient erythropoiesis, especially when other markers are insufficient.
  • The predictive value of ZPP for iron therapy response in renal failure patients is limited.
  • Further research is needed to understand ZPP's role in complex clinical scenarios like renal failure.

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