Thyroid Stimulating Hormone (TSH)
Thyrotropin
Testing Information
Sample Type
Serum
Test Codes
630410
CPT Code
84443
Testing Area
Core Lab - Chemistry
Test Methodology
Abbott Alinity - Chemiluminescence Immunoassay
Reference Range
0-6 days: 0.7-15.4 uIU/mL7 days-1 month: 0.7-9.0 uIU/mL1 month-11 months: 0.75-8.2 uIU/mLMale, >11 months: 0.4-4.5 uIU/mLFemale, 12 months-17 years: 0.4-4.5 uIU/mLFemale, 18 years-45 years: 0.4-4.5 uIU/mLFemale, >45 years: 0.4-4.5 uIU/mL
Expected Turnaround Time
Results Available 24 hours from Receipt
Specimen Collection Criteria
Collect one gold top SST tube (minimum whole blood: 4 mL). Let specimen clot for 30-60 minutes and then centrifuge to separate serum from cells. Refrigerate after centrifugation.
Rejection Criteria
Grossly hemolyzed specimens, quantity not sufficient, improperly labeled
Specimen Validity and Retention
Centrifuged SST Tubes:Room Temperature (20-25°C): 4 hoursRefrigerated (2-8°C): 7 daysFrozen (-20°C or greater): UnacceptableSerum Aliquots:Room Temperature (20-25°C): 4 hoursRefrigerated (2-8°C): 7 daysFrozen (-20°C or greater): 7 daysSpecimens retained for 7 days after testing
Courier Transportation
Transport centrifuged tube refrigerated (2-8°C)
Clinical Utility
TSH levels are measured to evaluate thyroid function and replacement therapy.
