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HelpTest Code LAB4364 TSH WITH REFLEX TO FREE T4
Specimen Type
Preferred Specimen: Lithium Heparin Plasma (Mint Green Top, Dark Green Top)
Alternative Specimen: Serum (SST, Gold, Corvac, Tiger, Red Top Tube) EDTA Plasma (Lavender Top Tube)
Specimen Volume
1 mL
Minimum Volume
0.5 mL
Turnaround Time
STAT: 1 hour
Routine: 4 hours
Test Schedule
Daily
Sample Stability
Refrigerated: 6 days
Method
Chemiluminescent MIcroparticle Immunoassay (CMIA)
Reference Ranges
TSH (Reflex) µIU/mL
4 Days to 6 Months: 0.73 - 4.77
6 Months to 14 Years: 0.7 - 4.17
14 Years to 19 Years: 0.47 - 3.41
19 Years and older: 0.35 - 4.94
Synonyms
Thyroid Stimulating Hormone with Reflex
Test Components
TSH IU/mL; Free T4, µg/mL if TSH is abnormal.
CPT Codes
84443