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LP FINDINGS

Neurosurgery

LP FINDINGS

1. Non-clotting, bloody CSF that does not clear with subsequent tubes.
2. Xanthochromia - yellow or pink discoloration of CSF due to bilirubin/heme pigments released by breakdown of RBC. This is the most reliable means of differentiating SAH from a traumatic tap. Spectro-photometry is more accurate than visual inspection.
3. RBC count - should not drop significantly. Usually > 100,000 cells/mm3. Should not increase significantly (this would indicate a traumatic tap).
4. Protein - elevated due to blood breakdown products.
5. Glucose - may be normal or reduced as RBCs metabolize glucose with time.


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REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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