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Worcestershire Acute Hospitals NHS Trust
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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: 11 January 2022