💧 Effusion / CSF Interpretation
Interpret pleural fluid by Light's criteria, ascites by SAAG and CSF by the cell/protein/glucose pattern. Browser-side reference.
Effusion / CSF Interpretation
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When to use
Separate exudate from transudate, identify portal hypertension and give a first read of CSF; pairs with the Light and CSF-correction tools.
How it works
Light's exudate (any): fluid/serum protein > 0.5, fluid/serum LDH > 0.6, fluid LDH > ⅔ ULN. SAAG ≥ 11 g/L = portal hypertension.
Key points
- After diuresis, a serum-fluid albumin gradient > 12 g/L suggests a pseudoexudate.
- SAAG ≥ 11 g/L points to portal hypertension.
- Bacterial CSF: neutrophils, high protein, low glucose (CSF/blood < 0.4).
- Correct CSF WBC for a traumatic tap.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.