Activated Partial Thromboplastin Time, Plasma
Tests:Activated Partial Thromboplastin Time, Plasma
| Overview | |
|---|---|
| Department | Haematology |
| Test Code | TAPT |
| Synonyms | APTT
PTT Activated Partial Thromboplastin Time Coagulation screen |
| Test 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 |
| Specimen Requirements | |
| Specimen Type | Plasma |
| Specimen Transportation | Room temperature |
| Preferred | 2.7mL Na citrate Blue-Top |
| Acceptable | |
| Unacceptable | Clotted specimen
Under or overfilled Moderately haemolysed Specimen older than 12 hours Unfractionated heparin monitoring older than 2 hours |
| Paediatric Requirements | 1 mL Na citrate Blue-Top |
| Aliquot Requirements | |
| Sample Type | |
| Minimum Volume | |
| Aliquot Transportation | |
| 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 |
| Comments | |
| APTT is part of a coagulation screen. 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). | |