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Test Code 521193133 TSH w/ Reflex to FT4

Performing Laboratory

Torrance Memorial Laboratories

Testing Algorithm

TSH will be performed.  If results are out of reference range, Free T4 will be added at an additional charge.

Specimen Requirements

Submit only 1 of the following specimens:

 

Hospital Preferred Specimen Type: Plasma

Container/Tube: Lithium heparin gel

 

Outreach Preferred Specimen Type: Serum

Container/Tube: Serum gel

 

Spin Instructions:

Serum gel:  Allow to sit for 30 minutes prior to spinning.  Spin within 2 hours of collection.

Heparin plasma: Spin within 45 minutes of collection.   

Also acceptable:  Red top tube

Specimen Transport Temperature

Ambient

 

Storage Temp Stability

Room Temperature:  24 hours

Refrigerated:  7 days

Methodology

LOCI—Luminescent Oxygen Channeling Immunoassay

 

Reference Range

TSH:

1 - 23 months: 0.816 – 5.91 uIU/mL
2 - 12 years: 0.662 – 3.90 uIU/mL
13 – 20 years:  0.463 – 3.98 uIU/mL
> 20 years:  0.350 – 4.940 uIU/mL

 

Reference range change as of 6/22/2021

 

See Free T4 listing for those reference ranges

Day(s) Test Set Up/TAT

Performed:

Daily

Available STAT

 

STAT:  < 1 hr

Routine:  < 4 hrs

Aliases

Thyroid Stimulating Hormone w/reflex

CPT Code

84443 (TSH)

84439 (Free T4) if needed

 

*Additional codes/fees may apply*