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Test Code S1723 Thyrotropin-Releasing Hormone (TRH) Stimulation Test, Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Chemiluminescence Enzyme Immunoassay (CEIA)

Literature References:

1. Package insert: ADVIA Centaur TSH-3. Bayer Diagnostics, Revision F.
2. Package insert: Centaur Reference Manual. Bayer Diagnostics, Revision D.
3. Package insert: ADVIA Centaur Assay Manual. Bayer Diagnostics, Revision AT.

Specimen Requirements

Specimen Type: Plasma

Container/Tube: Mint-green top (lithium heparin)

Specimen Volume: Full tube

 

Collection Instructions:

1. Draw specimen prior to giving TRH.

2. Give a bolus of TRH (400-500 mcg intravenous bolus at 0-minutes).

3. Draw specimens at 20-minutes and at 30-minutes after the injection.

Additional Information:

1. Draw times are required.

2. Label specimens appropriately (corresponding draw times).

3. Test performed is #1723 TSH (Thyroid-Stimulating Hormone; Thyrotropin), Plasma.

Day(s) Test Set Up

Monday through Sunday

Turnaround Time:
STAT: 1 hour after receipt in laboratory 
Routine: 2 to 4 hours after receipt in laboratory

Reference Values

Normal: a rise in TSH

Magnitude of the rise is dependent on the assay, but a rise of >2 mcIUnits/mL is generally considered to exclude hyperthyroidism.

Lack of normal response is sensitive but not specific for clinical hyperthyroidism. Slight increases in thyroid hormone levels (euthyroid patients with autonomous thyroid nodules) suppress the TSH response.

Test Classification and CPT Coding

84443-Each

Additional Information

For BJH Laboratory Use Only

Alternate Tube(s):

1 plain, red-top tube

Analyte Stability:

See Analyte Stability Chart in Special Instructions.

Laboratory Processing Instructions:

Test performed in BJH Chemistry. Test performed is #1723 TSH (Thyroid-Stimulating Hormone; Thyrotropin), Plasma). Centrifuge upon receipt. Make a 1-mL aliquot and deliver to the Centaur. Original tube is stored refrigerated for 1 week.

Specimen Transport Temperature

Ambient

Special Instructions