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Pathology Clinical Services

Department of Pathology

THYROXINE (087-0693)

Synonyms: T4

CPT 4 Code: 84436

Test Order Mnemonic: T4

Lab: Clinical Chemistry

Request Form: Routine Chemistry Form 1

Collection: Routine venipuncture; AM collection preferred

Storage Instructions: Red-topped Tube: Centrifuge, remove serum from cells, refrigerate until delivered to lab; if delivery is delayed by more than 24 hours, freeze @ -20C.

Causes for Rejection: Gross lipemia or hemolysis. Blood drawn in any anticoagulated tube.

Availability: Samples are received 24 hours per day at Sample Management, Room 5.136 McCullough.

Turnaround Time: 24 hours. Test is performed Monday-Friday

Special Instructions: The test can be ordered only once day. Additional requests require the approval of the laboratory director.

Specimen: Blood

Volume: 7 mL blood

Minimum Volume: 0.5 mL serum

Container: SST (gel barrier) or 7 or 10 mL red-topped tube (see storage instructions)

Reference Ranges: 4.7-11.4 mcg/dL; ranges vary with age.

Test Method: Chemiluminescence

Reviewed/revised March 2008 by D. Davis

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