The specimen drawn for a mixing study must meet the following conditions for accurate testing:
- A correctly filled 3.2% sodium citrate tube (as shown in the image on the right) must be collected.
- Proper centrifugation must occur to create platelet-poor plasma for analysis; platelet phospholipids can interfere with the mixing study if an antiphospholipid antibody is present.
- Testing must be performed within four hours of collection.
