Special instruction: Do not draw from an arm with a heparin lock or heparinized catheter.
Preparation instructions: Draw specimen one hour before next dose of heparin if heparin is being given by intermittent injection.
Turnaround time: Expected turnaround is within one day, although this may vary depending on other tests ordered for the same blood draw, and expected variation with testing.
Also known as:
- Activated Partial Thromboplastin Time