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| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Protime
Test CodePT
Alias/See Also
INR
Prothrombin time
PT
Prothrombin time
PT
Preferred Specimen
One full unopened 3.2% sodium citrate (light blue-top) tube.
Minimum Volume
Ratio of blood to citrate is critical. • 0.5 mL frozen plasma
Other Acceptable Specimens
1 mL frozen plasma: for heparinized patients or if testing will be delayed longer than 24 hours, centrifuge specimen within 1 hour of collection at 2500-3500 rpm. Transfer plasma to a plastic screw-cap vial and freeze at -20° C immediately. Ship on dry ice.
Instructions
Correct ratio of blood to citrate is critical. Do not overfill or underfill collection tube. Mix by inversion 4 times. For non-heparinized patients, maintain specimen at room temperature. Do not uncap. Stable 24 hours at room temperature.
Transport Container
3.2% sodium citrate (light blue-top) tube
Transport Temperature
Room temperature
Specimen Stability
Unopened light blue-top tube
Room temperature: 24 hours
Refrigerated: Unacceptable
Frozen: Unacceptable
Separated platelet poor plasma
Room temperature: 2 hours
Refrigerated: 4 hours
Frozen -20° C: 14 days
Frozen -70° C: 6 months
Room temperature: 24 hours
Refrigerated: Unacceptable
Frozen: Unacceptable
Separated platelet poor plasma
Room temperature: 2 hours
Refrigerated: 4 hours
Frozen -20° C: 14 days
Frozen -70° C: 6 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis; Gross lipemia; Improper blood to citrate ratio; Clotted; High hematocrits
Setup Schedule
24/7
Report Available
Same day
