40000:THYROXINE (T4)

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40000:THYROXINE (T4)
Methodology: Chemiluminescent Immunoassay (CLIA)
Edit Date: 1/22/2008
Performed: Daily
Released: Same day
CPT Code: 84436
Specimen Collection Details
Collection: One 7.5 mL serum separator tube (SST). Also acceptable: One 4 mL green top tube (heparin) or one 4.5 mL light green plasma separator tube (PST).
Handling: Centrifuge SST or PST and transport in original tube. Centrifuge heparin, separate plasma and pour into a plastic vial for transport. Refrigerate. Freeze if specimen cannot be assayed within 7 days. Allow no more than one freeze/thaw cycle.
Stability: 8 hours ambient, 7 days refrigerated, or 1 month frozen.
Standard Volume: 0.5 mL serum or plasma.
Minimum Volume: 250 µL serum or plasma.
Transport: Refrigerated, or frozen on dry ice.
Rejection Criteria: Specimen frozen/thawed more than once.
MEDICARE MAY REQUIRE A SIGNED ADVANCE BENEFICIARY NOTICE (ABN) FOR THIS TEST

Reference Range:
Adult 5.0-12.0 µg/dL