Test Directory

Thyroxine, free (free T4, FT4)

Brown Cap, Gel Clotted	Volume Range 0.2 ml Additive per Container None
Orange Cap	Volume Range 0.2 ml Additive per Container Lithium-heparin

Orange Cap - Paediatric	Volume Range 0.6 ml Additive per Container Lithium-heparin

Male & non-pregnant Female: 9 - 28 pmol/L

Birth - 7 days: 15 - 48 pmol/L

7 - 14 days: 14 - 36 pmol/L

14 - 28 days: 14 - 31 pmol/L

28 days - 1 year: 12 - 25 pmol/L

1 - 16 yrs: 11 - 23 pmol/L

Pregnancy

First trimester: 10 - 23 pmol/L

Second trimester: 9 - 20 pmol/L

Third trimester: 8- 17 pmol/L

RIE

51 Little France Crescent
Old Dalkeith Road
Edinburgh
EH16 4SA

Telephone (Biochemistry): 0131 242 6806

SJH

Howden Road West
Howden
Livingston
West Lothian
EH54 6PP

Telephone (Biochemistry): 01506 52 3160/1

WGH

Crewe Road South
Edinburgh
EH4 2XU

Telephone (Biochemistry): 0131 537 1910/1

4 days

See notes under Thyroid investigations

For further information on the potential for biotin interference please click here.