Prothrombin Time with INR

What it measures

• PTLOINC 5902-2
• INRLOINC 6301-6

Specimen

Specimen

One full unopened 3.2% sodium citrate (light blue-top) tube

Minimum volume

Ratio of blood to citrate is critical. Submit difficult draws in pediatric (light blue-top) tube 0.5 mL frozen plasma

Also accepted

1 mL frozen plasma: If the specimen will be delayed longer than 48 hours, centrifuge specimen for 15 minutes at 2500-3500 rpm. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet (buffy) layer and place into a transport tube and freeze at -20° C. Ship on dry ice.

Container

3.2% sodium citrate (light blue-top) tube

Temperature

Room temperature

A completely filled tube is necessary because the correct ratio of blood to citrate is critical (9:1). Mix by gentle inversion 3-4 times. Do not uncap.

Turnaround

Set up: Daily (Day shift and Night shift); Report available: 2 days

Billing

CPT 85610