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Erythrocyte zinc protoporphyrin testing in pregnancy
E J Harthoorn-Lasthuizen1, J Lindemans, M M Langenhuijsen
1Laboratory of Hematology, Bosch Medicentrum, 's-Hertogenbosch, The Netherlands.
Acta Obstetricia Et Gynecologica Scandinavica
|August 19, 2000
Summary
Serum ferritin and hemoglobin are unreliable for predicting iron needs during pregnancy. Erythrocyte zinc protoporphyrin is more effective in identifying iron deficiency anemia and guiding iron supplementation.
Area of Science:
- Obstetrics and Gynecology
- Hematology
- Nutritional Science
Background:
- Iron deficiency anemia is common in pregnancy.
- Accurate assessment of iron status is crucial for maternal and fetal health.
- Current diagnostic markers may have limitations in pregnancy.
Purpose of the Study:
- To evaluate serum ferritin, hemoglobin, and erythrocyte zinc protoporphyrin as indicators for iron supplementation in pregnant women.
- To determine the predictive value of these markers for iron deficiency and anemia development.
Main Methods:
- Prospective study of 97 healthy pregnant women.
- Measurement of serum ferritin, hemoglobin, and erythrocyte zinc protoporphyrin across trimesters.
- Iron supplementation guided by hemoglobin levels (< 113 g/L).
Main Results:
- Hemoglobin levels, not ferritin or E ZP, initially indicated need for iron therapy, likely due to hemodilution.
- In the third trimester, E ZP increase indicated evolving iron deficiency anemia in 14 women, but only 5 met hemoglobin criteria for therapy.
- Serum ferritin was low in 92% by the third trimester but did not predict iron deficiency or anemia.
Conclusions:
- Serum ferritin and hemoglobin are inadequate for diagnosing or predicting iron deficiency in pregnancy.
- Erythrocyte zinc protoporphyrin is a valuable tool for identifying iron deficient erythropoiesis and guiding iron therapy.
- Early detection of iron deficiency anemia requires careful interpretation of multiple biomarkers.