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Comparison of stainable iron in aspirated and needle-biopsy specimens of bone marrow
Abstract:
A comparison of stainable iron in simultaneously obtained aspirated smears and needle-biopsy specimens from 1,000 patients was undertaken. Significant differences occurred when iron was assessed as absent in the aspirated smear. In only 35% of the corresponding needle-biopsy specimens was iron absent. When only the aspirated smear was used, there was a significant overdiagnosis of iron deficiency. In general, iron tended to be less in the aspirated smear; however, correlations were better when iron stores were assessed as being present or increased in the aspirated smears, for stainable iron in the needle-biopsy specimen was always present in equal or greater amounts. Hemosiderotic smears (increased stainable iron) and needle-biopsy specimens (3+ -4+) correlated well. The aspirated smear and needle-biopsy are complementary procedures, and each has advantages. In the authors' experience, the needle-biopsy was preferable to the aspirated smear for evaluation of iron stores, particularly when iron stores were low or absent.
Insights
Needle-biopsy specimens are more reliable than aspirated smears for assessing stainable iron, especially when iron deficiency is suspected. Aspirated smears can lead to overdiagnosis of iron deficiency.
Area of Science:
- Hematology
- Clinical Pathology
Background:
- Accurate assessment of iron stores is crucial for diagnosing iron deficiency anemia.
- Stainable iron in bone marrow is a key indicator of iron status.
Purpose of the Study:
- To compare the accuracy of stainable iron assessment between aspirated smears and needle-biopsy specimens.
- To determine the reliability of each method in diagnosing iron deficiency.
Main Methods:
- Simultaneous collection of aspirated smears and needle-biopsy specimens from 1,000 patients.
- Microscopic evaluation of stainable iron in both sample types.
- Statistical comparison of iron assessment results.
Main Results:
- Aspirated smears significantly underestimated iron presence compared to needle biopsies (iron absent in 35% of biopsies vs. higher in smears).
- Using only aspirated smears led to overdiagnosis of iron deficiency.
- Correlation was better for higher iron levels; needle biopsies were superior for low/absent iron.
Conclusions:
- Needle-biopsy specimens are more accurate for evaluating iron stores than aspirated smears, particularly in cases of suspected iron deficiency.
- Both methods are complementary, but needle biopsy offers superior diagnostic value for iron status assessment.