Sign in →

Test Code LAB320 Prothrombin Time

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center / Asante Ashland Community Hospital

Specimen Minimum Volume

1 properly filled 2 mL Blue top tube

Billing Code

2010577

Methodology

Turbidimetric clot detection by measuring change in optical density

Specimen Requirements

Blue top tube - Refer to ORDER OF DRAW     Order of Draw

 

Note:  The ratio of blood to anticoagulant is critical 

Vacutainers must draw their full volume 

Syringe Draw:     

2.7 mL blood in 3 mL Blue top tube

1.8 mL blood in 2 mL Blue top tube

 

Specimens will not be accepted if tubes are not filled to their correct volume.

If multiple tests are drawn, draw coagulation studies first or second

Performing Department

Hematology

Day(s) Test Set Up

Monday through Sunday

Routine - same day

ASAP - 2 hours after receipt of specimen in lab

STAT - 1 hour after receipt of specimen in lab

Test Classification and CPT Coding

85610  -  Prothrombin time

Additional Information

Evaluation of extrinsic coagulation system; aid in screening for congenital deficiencies of factors II, V, VII, X; deficiency of prothrombin dysfibrinogenemia, afibrinogenemia (complete), heparin effect, coumadin or warfarin effect, liver failure, disseminated intravascular coagulation and in screening for Vitamin K deficiency.

Specimen Transport Temperature and Stability

Send to lab at room temperature.

Do not refrigerate as cold may activate Factor VII.

Specimen is stable unopened for 24 hours or opened for 4 hours.

NOTE: Refrigerated tubes will not be rejected.

 

AACH: Test within 24 hours or aliquot plasma and freeze

Reasons for Rejection

Quantity not sufficient (QNS)

Specimens not filled to correct volume

Lacking Two Patient Identifiers:

         1-Patient's First & Last name 

         2-Patient's Date of Birth

Hemolysis

Clotted specimen