View source for Tests:Activated Partial Thromboplastin Time, Plasma

''APTT is part of a coagulation screen''

{{DISPLAYTITLE: APPT, Plasma}}  

[[Category:Tests]] 

[[Category:Haematology]]  
{| class="wikitable"
! colspan="2" |
== Overview ==
|-
|Department
|Haematology  
|-
|Test Code
|TAPT
|-
|Synonyms
|APTT
PTT 

Activated Partial Thromboplastin Time 

Coagulation screen
|-
|Availability
|Monday - Sunday, testing routinely available out of hours 
|-
|Turnaround Time
|0.5 – 4 hrs  
|-
|Stability – Add test
|12 hours at room temperature  
2 hours for Unfractionated heparin monitoring 
|-
! colspan="2" |
== Specimen Requirements ==
|-
|Specimen 
|Plasma
|-
|Preferred
|2.7mL Na citrate <span style="background: #87cefa "> Blue-Top </span>    
|-
|Acceptable
|
|-
|Unacceptable
|Clotted specimen
Under or overfilled 

Moderately haemolysed

Specimen older than 12 hours

Unfractionated heparin monitoring older than 2 hours
|-
|Specimen Transportation
|Room temperature  
|-
|Paediatric Requirements  
|1 mL Na citrate <span style="background: #87cefa "> Blue-Top </span>    
|-
! colspan="2" |
== Aliquot Requirements ==
|-
|Sample 
|
|-
|Preferred Volume
|
|-
|Minimum Volume
|
|-
|Aliquot Transportation
|
|-
! colspan="2" |
== Clinical Information ==
|-
|Reference Intervals
|''Reference Range'' - 23-38 seconds  

''Paediatric range'' - contact laboratory  

''Therapeutic range'' -(unfractionated heparin) 50-80 seconds 
|-
|Test Method
|Mechanical clot detection performed on Stago Compact Max2 Analyser  
|-
|Advanced Notice
|Not required  
|-
|Patient Preparation
|Not required
|-
! colspan="2" |
== Comments ==
|-
| colspan="2" |Please give all clinical details, including all medication.  

If the patient is on unfractionated heparin, request APTT only.    

Please indicate if patient is on low molecular weight heparin (Clexane). 
|}