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Summary
Laboratory tests for iron deficiency are evolving. Serum ferritin and FEP measurements aid in recognizing iron deficiency at different stages, guiding diagnosis and monitoring in various clinical settings.
Area of Science:
- Clinical Biochemistry
- Hematology
- Diagnostic Laboratory Medicine
Background:
- Iron deficiency remains a significant health concern with consistent prevalence.
- Laboratory diagnostics for iron deficiency have advanced, incorporating serum ferritin and FEP measurements.
- Understanding the stages of iron deficiency is crucial for accurate diagnosis.
Purpose of the Study:
- To review and classify the laboratory recognition of iron deficiency.
- To delineate the optimal laboratory approaches for diagnosing iron deficiency in different clinical settings.
- To highlight the utility of specific biomarkers in identifying and monitoring iron deficiency.
Main Methods:
- Classification of iron deficiency into three stages: storage iron depletion, iron deficient erythropoiesis, and iron deficiency anemia.
- Utilizing laboratory markers such as serum ferritin, transferrin saturation (TS), free erythrocyte protoporphyrin (FEP), and mean corpuscular volume (MCV).
- Comparing diagnostic utility of tests in outpatient versus inpatient settings, and in the presence of confounding conditions like anemia of chronic disease.
Main Results:
- Storage iron depletion is identified by marrow examination or serum ferritin.
- Iron deficient erythropoiesis is indicated by TS, FEP, or MCV.
- Iron deficiency anemia is diagnosed by hemoglobin concentration or response to iron therapy.
- Serum ferritin is optimal for recognizing iron depletion in outpatient settings.
- Marrow iron examination is the preferred method for hospitalized patients, especially with comorbidities, though serum ferritin can often provide similar information.
- TS, FEP, and MCV are less reliable in hospitalized patients due to overlap with anemia of chronic disease.
Conclusions:
- The choice of laboratory tests for diagnosing iron deficiency should be tailored to the clinical context.
- Serum ferritin is a valuable tool for assessing iron stores and monitoring high-risk patients.
- Serial serum ferritin measurements are particularly useful for managing patients with chronic inflammatory conditions or renal failure.
- Accurate laboratory recognition of iron deficiency stages is essential for effective management and treatment.