<unk>  is a carbohydrate-free (desialated) isoform of<unk> , which is almost exclusively found in the cerebrospinal fluid. It is not found in blood, mucus or tears, thus making it a specific marker of cerebrospinal fluid, applied as an assay in cases where cerebrospinal fluid leakage is suspected.<unk>  would also be positive in patients with perilymph fluid leaks, as it is also present in inner ear perilymph. Thus,<unk>  in otorrhea would be suggestive of either a CSF leak or a perilymph leak.
Beta-2 transferrin
Hepcidin
Hemoglobin
Ferritin
Gamma globulin
Ovoferrin
Fetal hemoglobin
Sucrosomial iron