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Test ID BLOD5008 TSH REFLEX

AKA

Thyroid Stimulating Hormone with Reflex

Specimen Type/Requirements

Green-Top (Lithium heparin)Tube – preferred
Gold-Top (SST Serum) Tube

Specimen Volume

Preferred Volume 2 mL plasma or serum
Minimum Volume 1.5 mL plasma or serum

 

Stability/Transport

Room Temperature 24 hours  
Refrigerated 7 days Preferred for transport
Frozen 6 months  

 

Performed Test Frequency

Monday-Sunday

Methodology

Chemiluminescence – Direct Sandwich

Performing Lab

Sanford Laboratories-Bemidji

CPT

TSH 84443 (FT4 84438, FT3 84481)

Additional Information/Reflex Testing

If TSH is normal no further testing will be performed.
A high or low TSH will reflex to Free T4 (FT4) (Test BLOD0596)

 
If FT4 is elevated no further testing will be performed.

A normal or low FT4 will reflex to Free T3 (FT3) (Test BLOD0600).