Thyroid Stimulating Hormone 3rd Generation
Also known as: TSH 3
Use
The Thyroid Stimulating Hormone (TSH) 3rd Generation test is used to evaluate thyroid function and diagnose disorders related to thyroid gland activity, such as hypothyroidism or hyperthyroidism. This highly sensitive test aids in the detection of even small changes in TSH levels, which can be critical in managing thyroid disorders, particularly in patients on thyroid hormone replacement therapy or those with subclinical hypothyroidism.
Special Instructions
Use a serum separator tube or plasma separator tube for specimen collection. Also acceptable are Lavender (EDTA) or green (sodium or lithium heparin) tubes. It is important to allow specimens to clot completely at room temperature before separating serum or plasma from cells. Transfer 1 mL (minimum 0.5 mL) to an ARUP standard transport tube.
Limitations
Grossly hemolyzed specimens are not acceptable for analysis. Stability of the specimen is crucial, with samples remaining stable for 8 days at room temperature after separation of cells, 2 weeks if refrigerated, and up to 2 years if frozen. As with many laboratory tests, the presence of certain medications or the timing of specimen collection relative to treatment schedules may affect test results.
FDA ApprovedNew York Approved
Methodology
Immunoassay (ECLIA)
Biomarkers
LOINC Codes
- 11580-8
- 11580-8
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
1 mL
Minimum Volume
0.5 mL
Container
ARUP standard transport tube
Collection Instructions
Allow specimen to clot completely at room temperature. Separate serum or plasma from cells as soon as possible or within 2 hours of collection.
Storage Instructions
Refrigerated.
Causes for Rejection
Grossly hemolyzed specimens.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 8 days |
| Refrigerated | 2 weeks |
| Frozen | 2 years |