Activated Paritial Thromboplastin Time (aPTT)
Methodology
This test is performed on a Sysmex fully automated coagulation system which utilizes optical detection technology.
Test Utility
The test is used to measure and evaluate how long it takes to form a clot in blood.
Specimen Collection and Preparation
Collect a blood sample in the following tube:
Light Blue 3.2% Sodium Citrate Tube – Tube must be filled to 90% of minimum/maximum etched fill line
If possible, centrifuge the specimen at 3000 rpm for 15 min, remove plasma and freeze
Specimen Storage and Stability
Store whole blood at the following temperatures:
Room temperature: 24 hours
Refrigerated 2°C to 8°C: Unacceptable
Frozen: Separated plasma only.
Specimen Rejection
Insufficient sample volume – Tube must be filled to with 90% of etched fill line
Sample not stored at proper temperature
Frozen whole blood
Hemolyzed samples
Severely lipemic specimens
Specimen labeled incorrectly or not labeled
Reference Pages
Performed
Monday – Sunday, 16 hours a day
Result available within 24 hours of receipt in laboratory
NOTE: Specimens are refrigerated (2-8°) for 7 days before disposal
Contacts
Vibra Health Laboratory
1307- A, Allen Dr Troy, MI 48083
(248) 846-0663