Test Name

Free T4

Test Code

592

Unit

ng/dL

Station

Chemistry

CPT Code

84439

Performing Facility

American Medical Labs, Herzliya
Pituah

Analyzer

Roche cobas 6000

Test Method

Electrochemiluminescence immunoassay
(ECLIA)

AML Preferred Tube

5 mL SST gel

Storage Instructions

Stability:

7 days at 2 to 8 ^oC

30 days at -20 ^oC , Freeze only once.

Min. Volume

1 mL

Turn-Around-Time

One day.

Intended Use

Free T4 is a useful tool in clinical routine dignostics for the assessment of the thyroid status . It should be measured together with TSH if thyroid disorders are suspected and is also suitable for monitoring thyrosuppressive therapy.

Limitations

Samples should not be taken from patients receiving therapy with high biotin doses (i.e. > 5 mg/day) until at least 8 hours following the last biotin administration.

Patient Preparation

No patient preparation needed.

Reasons for Rejection

Do not use sodium citrate tube, Improper labelling.

Adult Reference Ranges

0.8-1.9 ng/dL