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Assessment of iron stores in anemic geriatric patients
Insights
Diagnosing iron deficiency anemia in older adults is challenging. New transferrin saturation and serum ferritin thresholds can improve accuracy when noninvasive tests are inconclusive.
Area of Science:
- Geriatric Medicine
- Hematology
- Clinical Diagnostics
Background:
- Anemia is common in geriatric patients.
- Distinguishing iron deficiency anemia from anemia of chronic disease can be difficult using standard noninvasive tests.
Purpose of the Study:
- To evaluate the effectiveness of noninvasive measures in identifying the cause of anemia in geriatric patients.
- To determine optimal thresholds for transferrin saturation ratio and serum ferritin in diagnosing iron deficiency anemia in this population.
Main Methods:
- Retrospective analysis of 66 anemic geriatric patients.
- Comparison of noninvasive markers (serum iron, TIBC, transferrin saturation, ferritin) with bone marrow iron stores.
Main Results:
- Noninvasive tests showed poor accuracy in differentiating iron deficiency from chronic disease.
- A transferrin saturation ratio < 11% and serum ferritin < 45 pg/L were better indicators of iron deficiency than currently accepted values.
Conclusions:
- Standard noninvasive tests are insufficient for diagnosing iron deficiency anemia in many geriatric patients.
- Revised cut-off values for transferrin saturation and serum ferritin improve diagnostic accuracy for iron deficiency in the elderly.
Abstract:
Of patients referred to a geriatric service, 66 were identified who were clearly anemic (hemoglobin less than 12 g in men, less than 11 g in women) but whose cause of anemia was not readily identifiable by noninvasive measures. The difficulty in distinguishing iron deficiency from chronic disease as a cause of anemia by noninvasive means (serum iron, total iron binding capacity, transferrin saturation ratio, and serum ferritin), is highlighted by the poor power of these investigations when compared with bone marrow iron stores. A transferrin saturation ratio of less than 11% and a serum ferritin of less than 45 pg/L serve better than currently accepted values to identify iron deficiency in this population.