CSF albumin is a measurement used to determine the levels of albumin

Albumin

Albumin refers generally to any protein that is water soluble, which is moderately soluble in concentrated salt solutions, and experiences heat denaturation. They are commonly found in blood plasma, and are unique to other blood proteins in that they are not glycosylated...

 in cerebrospinal fluid

Cerebrospinal fluid

Cerebrospinal fluid , Liquor cerebrospinalis, is a clear, colorless, bodily fluid, that occupies the subarachnoid space and the ventricular system around and inside the brain and spinal cord...

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A closely related test, CSF total protein is a measurement used to determine the levels of protein in cerebrospinal fluid

Cerebrospinal fluid

Cerebrospinal fluid , Liquor cerebrospinalis, is a clear, colorless, bodily fluid, that occupies the subarachnoid space and the ventricular system around and inside the brain and spinal cord...

. It combines the albumin, IgG, and other proteins.

It can be useful in distinguishing among causes of Meningitis

Meningitis

Meningitis is inflammation of the protective membranes covering the brain and spinal cord, known collectively as the meninges. The inflammation may be caused by infection with viruses, bacteria, or other microorganisms, and less commonly by certain drugs...

. It is more likely to be elevated in bacterial meningitis

Bacterial meningitis

Bacterial meningitis refers to meningitis that is caused by bacterial infection.-Signs and Symptoms:*Fever*Seizures*Meningismus*Headache*Vomiting*Photophobia*Altered mental status and coma*Anorexia...

 than in viral meningitis

Viral meningitis

Viral meningitis refers to meningitis caused by a viral infection. It is sometimes referred to as "aseptic meningitis" in contrast to meningitis caused by bacteria.An example is lymphocytic choriomeningitis....

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The upper normal range is 150 mg/dl in neonates, and 50 mg/dl in adults.