Thyroxine - free (FT4) *
REQUESTING AND COLLECTING

Ordering:
Presence of known thyroid disease, thyroid medications, interferring

drugs or other reason for testing is REQUIRED on request form.
Container(s):
Heparin tube (5 mL lime-top) - Preferred

Serum (gold-top) - Preferred

EDTA (5 mL purple-top) - Acceptable

GENERAL INFORMATION

Availability:
Test performed 24 hours /days Results available 2 hours after sample

arrival in laboratory.

Reference Intervals:
Change to Beckman-Coulter method on 2/9/18.

Results ~ 4 pmol/L lower.

New adult reference intervals applied:

Adult: 8.0 - 16.0 pmol/L

Age 7 days to 2 months: 11 - 30

Age 3 months to 12 months: 11 - 24

Age 2 years to adult: as per adult.

Pregnancy

1st Trimester: 6.0 - 16.0

2nd and 3rd Trimester: 4.0 - 12.0

(Preg RI derived form : Ekinci et al, ACB 2013)

Laboratory:
Auto Chemistry (8382-9164)

Patient Results:
(02) 8382-9100
Synonyms:
Free T4

Free thyroxine

FT4

T4

Clinical Hyperlink:
Thyroid Function Tests - SydPath website
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INSTRUCTIONS FOR REFERRING LABORATORIES
Handling & Transport:
Store and transport sample at 4°C.
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INSTRUCTIONS FOR HANDLING AT SYDPATH
SydPath Handling:
SPRO: Place on MPA (heparin first unless serum first for other tests)

Data Entry Code:
FT4

SydPath Division:
Chemical Pathology

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Date/Time published: 27/05/2020 16:37:24
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