Alpha Medical Lab
Prothrombin Time with INR
Ordered Test Code:
PT
| Lab Test Component | Requirement |
|---|---|
| Test Name | Prothrombin Time with INR |
| Alpha’s Order Test Code | PT |
| Specimen Collection Tube | Light Blue Top/Full |
| Collection Tube Handling | 1 mL frozen plasma: If the specimen will be delayed longer than 48 hours, centrifuge specimen for 15 minutes at 2500-3500 rpm. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet (buffy) layer and place into a transport tube and freeze at -20° C. Ship on dry ice. |
| Minimum Volume | 0.5mL frozen plasma |
| Transport Temperture | Frozen |
| Stability | Separated platelet-poor plasma: Room temperature: Not acceptable; Refrigerated: Not acceptable; Frozen: 14 days |
| Collection Instructions | “One full unopened 3.2% sodium citrate (light blue-top) tube. A completely filled tube is necessary because the correct ratio of blood to citrate is critical (9:1). Mix by gentle inversion 3-4 times. Do not uncap.” |
Clinical Significance
Screening test for abnormalities of coagulation factors that are involved in the extrinsic pathway. Also used to monitor effects of Warfarin therapy and to study patients with hereditary and acquired clotting disorders.
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