Overview
Marrow microenvironment integrates stromal signals, vasculature, and hematopoietic cells to sustain production.
Classification
| Component | Role |
|---|---|
| Stromal cells | Cytokine support and scaffolding |
| Sinusoids | Blood cell release route |
| Adipocytes | Marrow space; increases with age |
| Osteoblasts | Endosteal niche support |
Morphologic Features
Biopsy preserves spatial relationships; aspirate provides cytologic detail.
Laboratory Characteristics
- Reticulin stain for fibrosis on biopsy sections
- Simultaneous aspirate and biopsy when protocol requires
Reference Intervals
Cellularity reference descriptors are institution- and age-specific, no universal percentage cited here.
Clinical and Laboratory Significance
- Hypocellular for age + cytopenias, production failure pattern
- Increased reticulin, fibrosis assessment
Differential Considerations
Architecture disruption may accompany infiltration or fibrosis, hematopathology classification.
Comparison Tables
Marrow study roles
| Assessment | Specimen |
|---|---|
| Cellularity | Biopsy |
| Blast percentage | Aspirate smear |
| Fibrosis | Biopsy reticulin |
| Cytogenetics | Aspirate |
Classification Frameworks
Fibrosis grading and MDS classification in advanced modules.
Laboratory Notes
- Pre-analytical processing time-critical for marrow specimens.
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021.
- Rodak BF, Carr JH. Rodak's Hematology: Clinical Principles and Applications. 6th ed. Elsevier; 2020.
- Hoffbrand AV, Moss PAH, Pettit JE. Essential Haematology. 8th ed. Wiley-Blackwell; 2019.
- McKenzie SB, Williams JL. Clinical Laboratory Hematology. 4th ed. Pearson; 2022.
Professional Monographs
- Barnes PW, McFadden SL, Machin SJ, Doig K. Laboratory Hematology Practice. Wiley-Blackwell; 2012.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Standard. CLSI document EP28-A3c. CLSI; 2010.
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