Item Value
Test name Free T4 (by dialysis)
Available Stat? No
Turn around times Test performed Monday-Saturday. Turnaround time: 2-4 days.
Performed by Quest
Normal range
Prematures, 25-30 weeks, first week of life 0.5-3.3 ng/dL
Prematures, 31-36 weeks, first week of life 1.3-4.7 ng/dL
Cord blood, > 37 weeks 1.2-2.2 ng/dL
Birth-4 days 2.2-5.3 ng/dL
2 weeks-2 years 0.8-2.0 ng/dL
3-20 years 1.0-2.4 ng/dL
21-87 yr 0.8-2.7 ng/dL


Pregnancy:
First trimester 0.9-2.0 ng/dL
Second trimester 0.8-1.5 ng/dL
Third trimester 0.8-1.7 ng/dL
Container type Red top preferred, Gold top acceptable
Amount to Collect 4 mL blood
Sample type Serum

If you have additional questions regarding this test, please call: 415-353-1667