| Laboratory: | Clinical Biochemistry (AUTOMATED) | ||||||||||||||||
| Test Name: |
TRIIODOTHYRONINE, FREE (Free T3) - (P)
Test Code:
FT3
|
||||||||||||||||
| Clinical Information: |
Free T3 is available as a component of the Thyroid Reflex Testing protocol.
Free T3 will be performed when TSH < 0.09 mU/L Test Indications: This test is used in the second or third level evaluation of thyroid function in conjunction with TSH & free T4. Free T3 is the unbound and biologically active form & represents only 0.3% of total circulating T3. Patient Preparation Instructions: This test is unaffected by multivitamins (45 - 125 µg biotin) or biotin-only supplements. For additional information see: |
||||||||||||||||
| Collection Devices: |
|
||||||||||||||||
| Specimen Required: |
Plasma: 2.0 mL
Stability 7 days refrigerated, 1 month frozen |
||||||||||||||||
| Referral: |
Serum: 2.0 mL
Samples must be transferred to an aliquot tube and stored frozen if analysis will not be complete within 48 hours (#110-10-05 Serum / Plasma Separation Procedure & Transport)
|
||||||||||||||||
| Requisition: | |||||||||||||||||
| Reference Values: |
|
||||||||||||||||
| Availability: |
Daily
|
||||||||||||||||
| See Also: | |||||||||||||||||
| More Information: |
Free T3 is automatically performed when TSH < 0.09 mU/L except for ENDO, ENDM. Separate plasma and refrigerate.
|