Erythrocytes
- Sample Type
- Standard
- Fasting
- No
- Unit
- cells/mcL
Erythrocytes (Red Blood Cells) in the Cerebrospinal Fluid (CSF) are not normally present. Their presence indicates either a subarachnoid hemorrhage (SAH) or a traumatic tap (bleeding caused by the spinal needle during the procedure). Analyzing the erythrocyte count across successive collection tubes helps differentiate these two. In a traumatic tap, the RBC count usually decreases significantly from tube 1 to tube 4, whereas in SAH, the count remains relatively constant.
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Why Context Matters
Distinguishing between a life-threatening hemorrhage and an incidental traumatic tap is critical. Factors such as 'xanthochromia' (yellowish staining of the CSF supernatant) and the presence of erythrophages must be evaluated by a pathologist or neurologist.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Erythrocytes:
Official Sources
Research & Guidelines
- PubMed: Erythrocytes Clinical GuidelinesNCBI / PubMed
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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