Cookie Settings
This site uses cookies to store information on your computer, to improve your experience. One of the cookies this site uses is essential for parts of the site to operate and has already been set. You may delete and block all cookies from this site, but parts of the site will not work. To find out more about the cookies this site uses and how to delete them, please see the privacy notice.

[Skip to content]

Enter search here...
Worcestershire Acute Hospitals NHS Trust
.
.
Test
Activated Partial Thromboplastin Time/ Heparin
CategoryHaematology
Code
APTT/HEP
Test information
Must be analysed within 4 hours of collection
Pre-analytical
Lipaemic, jaundiced or haemolysed plasma may cause problems with testing
Reference range
Time is reagent dependent. 
Normal ratio = 0.8-1.2
Tube type
2.7ml blue top citrate 
1.8ml Paediatric citrate
Minimum volume
1 tube minimum 90% full - this is essential to ensure correct ratio of anti-coagulant to blood
Assay frequency
Routine
TAT Inpatient (urgent)
1 hour
TAT Inpatient
4 hours
TAT GP/Outpatient
4 hours
Referral lab
local
Page last updated: 08 September 2021