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Free T4 (by dialysis)
| Item | Value | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Approval req'd? | Yes, contact Chemistry/Immunology Resident at x3-1438. | ||||||||||||||||||||
| Available Stat? | No | ||||||||||||||||||||
| Test code | FT4D | ||||||||||||||||||||
| Test group | Thyroid tests | ||||||||||||||||||||
| Performed by | Quest | ||||||||||||||||||||
| Sendout? | Yes | ||||||||||||||||||||
| Method | Equilibrium dialysis, RIA | ||||||||||||||||||||
| Container type | Red top preferred, Gold top acceptable | ||||||||||||||||||||
| Amount to Collect | 4 mL blood | ||||||||||||||||||||
| Sample type | Serum | ||||||||||||||||||||
| Preferred volume | 2 mL serum | ||||||||||||||||||||
| Min. Volume | 0.2 mL serum | ||||||||||||||||||||
| Processing notes | Refrigerate. Order Quest # 35167 | ||||||||||||||||||||
| Units | ng/dL | ||||||||||||||||||||
| Normal range |
Pregnancy:
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| Synonyms | tetraiodothyronine; thyroxine | ||||||||||||||||||||
| Stability | Room temperature 1 week, refrigerated 1 week, frozen at -20C 4 weeks | ||||||||||||||||||||
| Turn around times | Test performed Monday-Saturday. Turnaround time: 2-4 days. | ||||||||||||||||||||
| Additional information | Testing is only indicated if there is a descrepancy between the results for TSH and Free T4. | ||||||||||||||||||||
| Medical Necessity? | Yes. Click here for more information | ||||||||||||||||||||
| LOINC code | 6892-4 | ||||||||||||||||||||
| Last Updated | 8/16/2011 10:42:38 AM | ||||||||||||||||||||
| Entry Number | 917 |
If you have additional questions regarding this test, please call: 415-353-1667