PT, Prothrombin Time with INR
Test Summary
Screening test useful in those patients with high risk to predict post op hemorrhage. The Prothrombin time (PT) in conjunction with the INR is used to monitor oral anticoagulants such as coumadin. Additional uses for PT testing in patients where acquired multiple deficiencies may be suspected. Such disorders may include DIC, liver disease, renal disease and severe malabsorption.
Aliases
- INR Protime Protime w/INR Pro-time with INR PT PT c INR PT w/ INR PT-INR
Specimen Collection
Special Instructions
N/A
Preferred Specimen
1 plastic (2.7mL) completely filled 3.2% Sodium Citrate whole blood (light blue top) tube
Minimum Volume
N/A
Instructions
Use standard venipuncture and disposal techniques.
Collect the required quantity of Sodium Citrate (light blue top) tubes.
Sodium Citrate (light blue top) tube: Completely filled tube with intact stopper must remain at room temperature and are stable only 24 hours.
*If testing cannot be performed within 24 hours then Sodium Citrate light blue top must be centrifuged. Sodium Citrate plasma must be removed then aliquoted into a plastic pour off tube and placed in a <−20 degrees C freezer.
Collect the required quantity of Sodium Citrate (light blue top) tubes.
Sodium Citrate (light blue top) tube: Completely filled tube with intact stopper must remain at room temperature and are stable only 24 hours.
*If testing cannot be performed within 24 hours then Sodium Citrate light blue top must be centrifuged. Sodium Citrate plasma must be removed then aliquoted into a plastic pour off tube and placed in a <−20 degrees C freezer.
Patient Preparation
N/A
Storage
Whole blood Sodium Citrate (light blue top) tube(s)
Transport Temperature
Room Temperature: Whole blood Sodium Citrate (light blue top) tube(s)
Refrigerated: Unacceptable for Sodium Citrate (light blue top) tubes whole blood or capped plasma aliquots
Frozen: Capped aliquots of Sodium Citrate plasma
Refrigerated: Unacceptable for Sodium Citrate (light blue top) tubes whole blood or capped plasma aliquots
Frozen: Capped aliquots of Sodium Citrate plasma
Specimen Stability
- Room Temperature: Whole blood Sodium Citrate (light blue top) tube(s) <
- 24 hours
- Refrigerated: Unacceptable for Sodium Citrate (light blue top) tubes whole blood or capped plasma aliquots
- Frozen: Capped aliquots of Sodium Citrate plasma (Polypropylene tubes recommended) <
- 14 days at <
- &minus
- 20 degrees C
- <
- 6 months at <
- &minus
- 70 degrees C
Limitations
N/A
Other Acceptable Specimens
N/A
Unacceptable Specimens
Rejected for hemolysis, clotted, improper fill, incorrect specimen type, thawed frozen aliquots, refrigerated plasma or blood, expired test tubes, >24 hours old if not processed into separated frozen plasma vials.
Order Code
PTINR
EPIC (Premier) Code
LAB348
Includes
N/A
CPT Code
- 85610
Billing Code
- 300482
CPT Statement
Methodology
Mechanical Clot Detection
FDA Status
FDA approved
Physician Attestation of Informed Consent
N/A
Testing Laboratory
CompuNet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine OH, 45439
2308 Sandridge Drive
Moraine OH, 45439
Department
Hematology
Reference Range
11.7-13.9 Seconds
Setup Schedule / Expected Turnaround Time
Daily; Report available: 1 day
Specimen Collection
Special Instructions
N/A
Preferred Specimen
1 plastic (2.7mL) completely filled 3.2% Sodium Citrate whole blood (light blue top) tube
Minimum Volume
N/A
Instructions
Use standard venipuncture and disposal techniques.
Collect the required quantity of Sodium Citrate (light blue top) tubes.
Sodium Citrate (light blue top) tube: Completely filled tube with intact stopper must remain at room temperature and are stable only 24 hours.
*If testing cannot be performed within 24 hours then Sodium Citrate light blue top must be centrifuged. Sodium Citrate plasma must be removed then aliquoted into a plastic pour off tube and placed in a <−20 degrees C freezer.
Collect the required quantity of Sodium Citrate (light blue top) tubes.
Sodium Citrate (light blue top) tube: Completely filled tube with intact stopper must remain at room temperature and are stable only 24 hours.
*If testing cannot be performed within 24 hours then Sodium Citrate light blue top must be centrifuged. Sodium Citrate plasma must be removed then aliquoted into a plastic pour off tube and placed in a <−20 degrees C freezer.
Patient Preparation
N/A
Storage
Whole blood Sodium Citrate (light blue top) tube(s)
Transport Temperature
Room Temperature: Whole blood Sodium Citrate (light blue top) tube(s)
Refrigerated: Unacceptable for Sodium Citrate (light blue top) tubes whole blood or capped plasma aliquots
Frozen: Capped aliquots of Sodium Citrate plasma
Refrigerated: Unacceptable for Sodium Citrate (light blue top) tubes whole blood or capped plasma aliquots
Frozen: Capped aliquots of Sodium Citrate plasma
Specimen Stability
- Room Temperature: Whole blood Sodium Citrate (light blue top) tube(s) <
- 24 hours
- Refrigerated: Unacceptable for Sodium Citrate (light blue top) tubes whole blood or capped plasma aliquots
- Frozen: Capped aliquots of Sodium Citrate plasma (Polypropylene tubes recommended) <
- 14 days at <
- &minus
- 20 degrees C
- <
- 6 months at <
- &minus
- 70 degrees C
Limitations
N/A
Other Acceptable Specimens
N/A
Unacceptable Specimens
Rejected for hemolysis, clotted, improper fill, incorrect specimen type, thawed frozen aliquots, refrigerated plasma or blood, expired test tubes, >24 hours old if not processed into separated frozen plasma vials.
Result Information
Methodology
Mechanical Clot Detection
Testing Laboratory
N/A
Reference Range
11.7-13.9 Seconds
Setup Schedule / Expected Turnaround Time
Daily; Report available: 1 day