Techniques for obtaining differential cell counts from bone marrow trephine biopsy specimens.

Area of Science:

• Hematology
• Anatomic Pathology

Background:

• Bone marrow aspirates and trephine biopsy specimens are crucial for diagnosing hematological disorders.
• Cellular distribution and marrow architecture provide vital diagnostic information.
• Standardized methods for analyzing these specimens are essential for accurate interpretation.

Purpose of the Study:

• To compare differential cell counts between bone marrow aspirates and trephine biopsy specimens.
• To evaluate two distinct sampling methods for trephine biopsy analysis.
• To assess the utility of trephine biopsy in quantifying bone marrow topography.

Main Methods:

• Differential cell counts were performed on 200 paired bone marrow aspirates and trephine biopsy specimens.
• Two sampling area methods for trephine biopsy specimens were assessed.
• Comparison of cell type distribution and topographical features between the two specimen types.

Main Results:

• Trephine biopsy specimens showed a higher proportion of immature myeloid cells compared to aspirates.
• Aspirates contained relatively more polymorphs and lymphocytes than trephine biopsies.
• An extensive sampling method for trephine biopsies yielded more consistent inter-specimen differences and allowed for topographical assessment.

Conclusions:

• Trephine biopsy, particularly with extensive sampling, offers valuable insights into bone marrow cellularity and architecture.
• This method provides information not typically obtainable from aspirates alone.
• The techniques are practical and can enhance the diagnosis of bone marrow disorders, especially those with prominent architectural disturbances like myelodysplastic syndromes.