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HelpTest ID BLOD5008 TSH Reflex
Specimen Type/Requirements
Light Green top (Lithium Heparin w/gel) tube - Plasma (preferred)
Gold top (Serum w/gel) tube - Serum
Red top (Serum w/out gel) tube - Serum
Specimen should be centrifuged and separated within 2 hours of collection.
Test may be affected by gross hemolysis, gross icterus and gross lipemia.
Specimen Volume
| Preferred Volume | 1.0 mL |
|---|---|
| Minimum Volume | 0.5 mL |
Stability/Transport
| Room Temperature | 8 hours | |
|---|---|---|
| Refrigerated | 6 days | Preferred for transport |
| Frozen | Greater than 6 days |
Performed Test Frequency
Monday through Sunday
Report Available
1 - 3 days
Additional Information
Reflex Criteria:
- If TSH is normal – no further testing.
- If TSH is high – FT4 will be done - no further testing.
- If TSH is low – FT4 will be done.
- If FT4 is elevated - no further testing.
- If FT4 is normal or low - a FT3 will be done.
Methodology
Chemiluminescent Microparticle Immunoassay (CMIA)
Performing Lab
Sanford Laboratories Sioux Falls, Fargo, Bismarck, Bemidji, Rapid City
CPT
84443