CSF/serum glucose ratio
The CSF/serum glucose ratio, also known as CSF/Blood glucose ratio, is a measurement used to compare CSF glucose and blood sugar.
| CSF/serum glucose ratio | |
|---|---|
| Reference range | 0.6 |
| LOINC | 2352-3 |
Because many bacteria metabolize glucose, and because the blood brain barrier minimizes transversal, the ratio can be useful in determining whether there is a bacterial infection in the CSF.
The normal ratio is 0.6.[1]
It is used to distinguish between bacterial and viral meningitis, as it is often lowered in bacterial meningitis and normal in viral meningitis.[2]
References
| BMP/ELECTROLYTES: | |||
| Na+ = 140 | Cl− = 100 | BUN = 20 | / |
| Glu = 150 | |||
| K+ = 4 | CO2 = 22 | PCr = 1.0 | \ |
| ARTERIAL BLOOD GAS: | |||
| HCO3− = 24 | paCO2 = 40 | paO2 = 95 | pH = 7.40 |
| ALVEOLAR GAS: | |||
| pACO2 = 36 | pAO2 = 105 | A-a g = 10 | |
| OTHER: | |||
| Ca = 9.5 | Mg2+ = 2.0 | PO4 = 1 | |
| CK = 55 | BE = −0.36 | AG = 16 | |
| SERUM OSMOLARITY/RENAL: | |||
| PMO = 300 | PCO = 295 | POG = 5 | BUN:Cr = 20 |
| URINALYSIS: | |||
| UNa+ = 80 | UCl− = 100 | UAG = 5 | FENa = 0.95 |
| UK+ = 25 | USG = 1.01 | UCr = 60 | UO = 800 |
| PROTEIN/GI/LIVER FUNCTION TESTS: | |||
| LDH = 100 | TP = 7.6 | AST = 25 | TBIL = 0.7 |
| ALP = 71 | Alb = 4.0 | ALT = 40 | BC = 0.5 |
| AST/ALT = 0.6 | BU = 0.2 | ||
| AF alb = 3.0 | SAAG = 1.0 | SOG = 60 | |
| CSF: | |||
| CSF alb = 30 | CSF glu = 60 | CSF/S alb = 7.5 | CSF/S glu = 0.6 |
- Karen Roos (2005). Principles of neurologic infectious diseases. New York: McGraw-Hill, Medical Pub. Division. p. 4. ISBN 0-07-140816-9.
- Tamune H; et al. (2014). "Cerebrospinal fluid/blood glucose ratio as an indicator for bacterial meningitis". Am J Emerg Med. 32 (3): 263–6. doi:10.1016/j.ajem.2013.11.030. PMID 24361137.
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