Beta-2 Transferrin
Label Mnemonic: B2TD
Epic Lab Code: LAB2708
Downtime Form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Commercial Mail-out Laboratory
5231 RCP
Aural or Nasal Fluid
Collection Medium:
Sterile container
Preferred Minimum: 2 mL aural or nasal fluid in a sterile container
Absolute Minimum: 1 mL aural or nasal fluid in a sterile container
Turn Around Time:
1-4 days upon receipt at reference laboratory
Reference Range:
None detected
Interpretive Data:
Detection of a beta-2 transferrin band by IFE is diagnostic for the presence of cerebrospinal fluid (CSF). This test is useful in the differential diagnosis for CSF otorrhea or CSF rhinorrhea. Beta-2 transferrin is not detected by this methodology in normal serum, tears, saliva, sputum, nasal, or aural fluid.
Test Limitations:
The beta-2 transferrin protein assay by IFE methodology is not a reliable method for detecting human perilymph due to the low sensitivity of the assay.
Qualitative Immunofixation Electrophoresis
CPT Code:
86335 IFE Fluid