Lab Test

Tumor Necrosis Factor Alpha, Plasma

Test Codes

Mayo: TNFA, EPIC: LAB6347, Beaker: XTNFA

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One Lavender-top EDTA

Critical frozen. Send specimen for processing immediately after collection. 

Physician Office/Draw Specimen Preparation

Critical frozen. Immediately centrifuge to separate plasma from cells. Transfer plasma to a plastic transport tube and freeze (-20°C/-4°F or below) within 30 minutes.

Preparation for Courier Transport

Transport: 0.5 mL plasma, frozen (-20°C/-4°F or below). (Minimum: 0.3 mL)

Rejection Criteria

Specimens not collected and processed as indicated.

In-Lab Processing

Critical frozen. Immediately centrifuge to separate plasma from cells. Transfer plasma to a plastic transport tube and freeze (-20°C/-4°F or below) within 30 minutes

Transport: 0.5 mL plasma, frozen (-20°C/-4°F or below). (Minimum: 0.3 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 24 hours
Frozen (-20°C/-4°F or below): 21 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Mayo Clinic Laboratories in Rochester, MN.

Performed

Thursday.
Results available in 2-9 days.

Reference Range

By report.

Test Methodology

Electrochemiluminescence.

Interpretation

By report.

Clinical Utility

Elevated levels are seen in septic shock as well as in the CSF of patients with meningitis and other central nervous system processes such as multiple sclerosis.

CPT Codes

83520
LOINC:  3074-2

Contacts

Last Updated

7/15/2021

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