| 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 # |
PT
MessageTest performed at York Hospital Lab.
Test Code
PT
Alias/See Also
Prothrombin Time
Protime
Protime
CPT Codes
85610
Preferred Specimen
Whole blood collected in a 3.2% sodium citrate (light blue-top) tube NOTE: This tube can also be used for in-house D-Dimer, PTT, and/or Fibrinogen testing.
Other Acceptable Specimens
0.5 mL platelet-poor plasma collected in a 3.2% sodium citrate (light blue-top) tube, transferred to a plastic screw-cap vial
Instructions
Draw blood into light blue-top tube, filling tube to mark indicated on the tube. Do not overfill.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 24 hours
Refrigerated: Not recommended
Frozen (plasma): 2 weeks
Frozen (whole blood): unacceptable
Refrigerated: Not recommended
Frozen (plasma): 2 weeks
Frozen (whole blood): unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed specimens
Refrigerated specimens
Refrigerated specimens
Methodology
Clotting Assay
Setup Schedule
Daily
Report Available
Next Day Available STAT 1/2 Hour
Reference Range
PT 11.6-14.6 seconds
INR 0.85-1.15
ACCP, 2004 Recommendations for oral anticoagulant therapy:
Critical Values
INR >5.0
INR 0.85-1.15
ACCP, 2004 Recommendations for oral anticoagulant therapy:
| Low Intensity | 1.50 - 2.00 INR |
| Mod Intensity | 2.00 - 3.00 INR |
| High Intensity or High Intensity |
2.50 - 3.50 INR 3.00 - 4.00 INR |
Critical Values
INR >5.0
Clinical Significance
This is a screening test for abnormalities of coagulation factors that are involved in the extrinsic pathway. Test is also used to monitor effects of Warfarin therapy and to study patients with hereditary and acquired clotting disorders.
