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Test Code TSH3 THYROID STIMULATING HORMONE

Important Note

The results of this assay can be falsely decreased due to the consumption of Biotin. Patients should discontinue the use of vitamins or supplements that contain Biotin 12 hours before blood draw. See Resources for more information.

Third Generation Assay put in use on 11/7/2013

Test subject to Medicare National Coverage Determination (NCD). See Medical Necessity documentation requirements by clicking on  Medicare National Coverage Determinations under General Information to left of this screen.

Additional Codes

LAB129

Performing Laboratory

Porter Hospital Laboratory

Specimen Requirements

Specimen Type: Blood
Container/Tube: Tiger top, serum gel
Specimen Volume: Full tube, submit 1.5 mL serum
Specimen Minimum Volume: 0.75 mL for full cascade
Collection Instructions:
1. Send specimen in original tube.
2. If there is a delay in transport of >1 hour, centrifuge tube.
3. Centrifuged samples are stable for:
• 1 day at room temperature
• 7 days at 2 – 8ºC

Specimen Transport Temperature

Refrigerated

Test Classification and CPT Coding

84443

Test Schedule / Analytical Time / Test Priority / Turn Around Time

Daily / 24 Hours /  Available STAT / Routine - 4 Hours

                                                         STAT - 60 Minutes

Normal Reference Values

1-23 months: 0.867-6.430 mIU/L

2-12 years: 0.704-4.010 mIU/L

13-20 years: 0.516-4.130 mIU/L

21 and over: 0.360-3.740 mIU/L

Critical Values

None