Test Code TSHRFT4 Thyroid Stimulating Hormone with reflex to Free T4

Additional Codes

Cerner	NextGen
TSH w/Reflex to Free T4	TSH w/Reflex to Free T4

Patient Preparation

None

Collection Instructions

Standard phlebotomy practices.

Specimen Requirements

Container

Specimen Type	Tube
Serum	or
SST	or or

Stability

Storage	Temperature	Stability
Room Temperature	18-28°C	Not recommended
Refrigerated	2-8°C	≤ 7 days
Frozen	≤-20 °C	4 weeks Thaw 1 time only

Rejection Criteria

Gross Hemolysis

Turbid Specimens

Result Reporting and Reference Values

Refer to:
- Thyroid Stimulating Hormone - Fairbanks Memorial Hospital
- Free T4 - Fairbanks Memorial Hospital

Reflex Testing

When TSH results are either < 0.46 µIU/mL or > 4.69 µIU/mL than a FT4 will be performed.

Limitations

Refer to:
- Thyroid Stimulating Hormone - Fairbanks Memorial Hospital
- Free T4 - Fairbanks Memorial Hospital

Useful For/ Methodology

Refer to:
- Thyroid Stimulating Hormone - Fairbanks Memorial Hospital
- Free T4 - Fairbanks Memorial Hospital
When TSH results are either < 0.46 µIU/mL or > 4.69 µIU/mL than a FT4 will be performed.