A CSF glutamine level is an indirect measure of CSF:

Name: A CSF glutamine level is an indirect measure of CSF:
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CSF glutamine level is used as an indirect measure of CSF ammonia levels. In the brain, excess ammonia is converted to glutamine, which can be measured in the CSF. Elevated CSF glutamine levels indicated increased ammonia levels in the brain, often seen in conditions like hepatic encephalopathy.

A CSF Glutamine Level Is an Indirect Measure of CSF