Prothrombin Time/INR (PT)

CPT: 85610

Expected Turnaround Time

1 - 3 days


Specimen Requirements


Specimen

Citrated plasma


Volume

1 mL


Minimum Volume

1 mL (Note: This volume does not allow for repeat testing.)


Container

Light blue-top (sodium citrate) tube


Storage Instructions

Ship frozen on dry ice.


Test Details


Methodology

Clot, calculation


Reference Interval

Prothrombin Time Age Range (sec) 0 - 30 days 9.8 - 13.2 1 - 6 months 9.8 - 12.6 7 months - 1 year 9.8 - 12.2 2 - 17 years 9.9 - 12.1 18 years and older 9.1 - 12.0 INR Age Range (ratio) 0 - 1 month 0.9 - 1.4 >1 month 0.9 - 1.2