Can a lavender top be used for a PT and PTT?

Yes, a lavender top tube can be used for prothrombin time (PT) and activated partial thromboplastin time (PTT) tests. Lavender top tubes contain EDTA, an anticoagulant that helps preserve the blood sample for accurate coagulation testing. However, some laboratories prefer using specific tubes, like blue top tubes for PT and PTT, to ensure optimal test performance, so it's best to confirm with the testing facility.