PT/INR

Message

HEMATOLOGY/COAG WRJ

Test Code

PT/INR

Alias/See Also

INR&PT, PROTHROMBIN, PROTIME, PROTIME INR, PROTIME AND INR

Preferred Specimen

PLASMA

Minimum Volume

4.5mLs

Instructions

DRAW 1 NA CITRATE(LIGHT BLUE) TOP TUBE, *** TUBE HAS TO BE FULL TO THE LINE. ANYTHING BELOW THAT NEEDS TO BE REDRAWN.SPECIMENS DRAWN FROM HEPARINIZED LINE MUST BE PURGED WITH 15 ml BLOOD. TUBE MUST BE ADEQUATELY (AT LEAST 90%) FILLED, MIXED BY GENTLE INVERSION, NO HEMOLYSIS AND DELIVERED IMMEDIATELY TO LAB.

Transport Container

ORIGINAL TUBE

Transport Temperature

ROOM TEMPERATURE

Specimen Stability

Samples good for 24hrs from time of collection in an unopened tube at room temperature. Since storage at refrigerated temps may result in cold activation of factor VII, blue tops when being transported should not be placed directly on ice packs or ice.

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

BELOW 90% FILL LEVEL OR HEMOLYSIS OF PLASMA

Methodology
Photo-optical endpoint/calculation

Setup Schedule

DAILY

Report Available

DAILY

Reference Range

Prothrombin Time (PT) 9.8-13.3 sec
INR Therapeutic range 2.0-3.5

Clinical Significance

Screening test for abnormalities of coagulation factors that are involved in the extrinsic pathway. Also used to monitor effects of Warfarin therapy and to study patients with hereditary and acquired clotting disorders.

Performing Laboratory
WHITE RIVER JUNCTION VT VA- HEMATOLOGY/COAG 802-295-9363 EXT: 5521, 5523

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.