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Test ID: FT4

T4 Free (Free Thyroxine), Serum/Plasma

Orderable by Ontario ND

Test Overview

Method

Electrochemiluminescent immunoassay (ECLIA)

Result Included

Free T4 (Free Thyroxine)

Specimen

Specimen Type

Serum
Plasma (Heparin)
Plasma (EDTA)

Volume

Sample Volume

1 mL

Specimen Comment

Barricor™ tube is not acceptable.

Collection & Handling

Handling Information

Store and send cold or frozen.

Stability

Refrigerated	Frozen
7 days	1 Month

Rejection Criteria

Criteria	Specification
Specimen	Barricor™ tube

Performance & Interpretation

Turnaround Time

2 days

Results

Free T4 (Free Thyroxine)

pmol/L

0 to < 1 month: 16 - 50

1 to < 12 months: 14 - 22

1 to < 19 years: 13 - 21

Male and Female (non-pregnant): 12 - 21

Female (pregnant):

First trimester: 11 - 19

Second trimester: 10 - 17

Third trimester: 8 - 15

ng/dL x 12.9

Referral Location

Canada

Interface & Setup

HL7 Interface Codes

Order Code	Result Name	Result Codes	Units
FT4	Free Thyroxine (FT4)	20703	pmol/L

Test Version

Last Updated

2023-02-01