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Test Code T4 T4 (THYROXINE), TOTAL ONLY

Methodology

Chemiluminescent Immunoassay

Performing Laboratory

West Virginia University Hospital, Inc.

Specimen Requirements

Collect: One 4.5 mL light green top tube

Pediatric: One light green top microtainer

Stability: Centrifuge within 2 hours after collection.

   Ambient: 24 hours

   Refrigerated: 6 days

   Frozen: 6 days

Alternate Specimen: Dark green top, red top, or gold top tube

Day(s) Test Set Up

Sunday-Saturday

Test Classification and CPT Coding

84436

UML Lab Processing Instructions

Transport Temperature: Refrigerated

UML Test Code: T4

Instructions: Sample must be centrifuged within two hours of collection. Serum/plasma must be removed from the red cells and put into aliquot tubes following centrifugation.

Reference Values

Reference interval: 4.0-11.0 ug/dL

Critical level: ≤1.0 ug/dL or ≥20.0 ug/dL