TSH with Free T4 Reflex
| Abbrev Code: | TSHR | ||
| Order Code: | LAB3795 | Order Name: | TSH with FreeT4 Reflex |
| Synonyms: | Thyrotropin, TSH Reflex | ||
| Methodology: | Roche: Electrochemiluminescence immunoassay (ECLIA)
Woodwinds: CMIA |
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| CPT Codes: | 84443 x1, 84443 x1 | ||
| Turnaround Time: | Varies by site. | ||
| Associated Links: | |||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 2.5 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Collection Instructions: | Chemistry Tests Containers Chart |
| Contraindications: | Large doses of biotin (10 mg or more per day) may cause clinically significant interference in TSH levels. If interference is suspected, it is strongly recommended that biotin is discontinued for at least one week prior to retesting. |
Processing and Shipping
| Specimen Processing: | Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | Roche: 8 days at room temperature; 14 days refrigerated; 24 months frozen. Freeze only once. |
| Test Performed at or Referral Lab | Chemistry (Roche-CSC Maple Grove, Roche-Grand Itasca, Roche-Lakes, Roche-Northland, Roche-Range, Roche-Ridges, Roche-Southdale, Roche-St. John's, Roche-UMMC East, Roche-UMMC West, Woodwinds) |
Interpretive
| Reference Range: |
Woodwinds:
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| Use: |
Thyroid gland function testing is based upon the normal response of the pituitary gland to decreased or increased levels of thyroid hormones, principally triidothyronine (T3) and thyroxine (T4). Pituitary and/or hypothalamic hypothyroidism may not be detected through this algorithmic approach and requires both TSH as well as FT4 measurements.
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