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Test Code PTINR PROTIME

Additional Codes

PROTIME

PT.

PTINR

LHW also offers fingerstick Protimes for all patients except those on Lovenox.

Methodology

Automated Coagulation Analyzer

Coagucheck Hand-held Analyzer

Specimen Requirements

Plasma

Container/Tube: Blue top tube (buffered sodium citrate)

Specimen Volume: Full Tube to appropriate line

Collection:

  1. PT specimens from patients should be centrifuged (centrifuge specimens for 10 min at 3500 rpm) or un-centrifuged with plasma remaining on top of cells in an unopened tube. Store at ROOM TEMPERATURE (18-24 Celsius) for no longer than 24 hours.
  2. If testing cannot be performed within 24 hours, centrifuge and aliquot plasma into plastic vial. Freeze (-20 Celsius) for up to 3 months.
  3. Properly label tube with patients name, DOB, requisition number and if plasma has been separated; type of tube sample drawn from, i.e. BLUE.

 

Specimen Transport/Stability

Room Temp -   (18-24 Celsius) 24 hours

Frozen - (-20 Celsius) 14 days if platelet poor plasma has been separated from cells

Frozen - (-70 Celsius) 12 months if platelet poor plasma has been separated from cells

Specimen Rejection

  • Clotted
  • Hemolyzed
  • Exceed stability requirements
  • Under or over filled tube
  • Unlabeled specimen
  • Age of specimen greater than 24 hours
  • Refrigerated

Maximum Laboratory Time

24 hours

 

Reference Ranges

PT      sec
   11.9 - 13.9
   
INR       INR
Usual Therapeutic Range     2.0 - 3.0
   
INR       INR

Range for recurrent systemic emboli

and mechanical prosthetic values

     3.0 - 4.0

COAGUCHECK users: If INR result is greater than 4.5, draw a blue top tube.

 

 

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

85610