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Thyroid Profile

SIM

50280 

CPT

84436; 84479 

Synonyms

FTI (Free Thyroxine Index); THY 

Specimen Type

Serum 

Container

4.0 ml Gold-top serum separator

Collection Instructions

None

Volume

2 ml serum, minimum 0.5 ml

Additional Information

none

Patient Preparation

none

Specimen Processing Instructions

Serum:  Allow to clot.  Centrifuge at 3380 rpm’s (±100) for a minimum of 10 minutes

Centrifuge within 2 hours of collection.

Transport Requirements

Refrigerated

Specimen Stability

Room temperature:  8 hours   Refrigerated: 5 days 

Rejection Criteria

If not centrifuged within 2 hours of collection.

Reference Range

T4 = 4.5 – 12.0 ug/dl

Tuptake = 27 - 36%

FTI = 1.00 – 4.80

Critical Value

none 

Test Includes

T4 (Total); T uptake; Calculated Free Thyroxine Index 

Methodology

Homogenous Enzymatic Immunoassay 

Testing Frequency

Daily, Monday - Sunday 

 

Reviewed By

Sandy Hammett 

Reviewed Date

1/31/2018

Supplemental

 

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