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General Information:

Web Links:

Mayo Clinic Laboratories

Test Code LAB0208868 Prothrombin Time (PT) with International Normalized Ratio (INR), Plasma

Methodology

Photometric Clot Detection

Performing Laboratory

CentraCare Laboratory Services

Specimen Requirements

Specimen Type: Plasma

Container/Tube: Light-blue top (3.2% sodium citrate)

Specimen Volume: 5 mL

Collection Instructions:

1.Tube must be full.

2. If less than 24 hours until testing, ambient whole blood is preferred.

3. If there is a delay in testing of >24 hours, centrifuge for 10 minutes at 3,000 rpm, freeze plasma immediately at

-20 0 C and send frozen  in plastic vial.

Specimen Transport Temperature

Ambient <24 hours

Frozen >24 hours

Reference Values

NORMAL PT

9.4-12.5 seconds
INR (stable oral anticoagulant therapy)
Std Rx: 2.0-3.0
High intensity Rx: 2.5-3.5
Critical value (automatic call-back): INR >4.0

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

85610