PROTHROMBIN TIME (PT), INR, PLASMA

Additional Codes

Software	Test Code
Label Text	INRT
EPIC	LAB320

Performing Laboratory

NorDx Laboratories

Useful For

Monitoring Coumadin® therapy

Method Name

Clot-Based Assay

Reference Values

INR: 0.9 - 1.2

Days and Times Test Performed

Monday through Sunday

Report Available

1 Day

Specimen Type

Plasma

Preferred Container

Light Blue Top Tube (Sodium Citrate) – Tube must be full at time of collection.

Specimen Collection and Handling

1. Draw blood in a light blue-top (3.2% sodium citrate) tube.

2. Forward promptly at ambient temperature only. SPECIMEN MUST ARRIVE WITHIN 24 HOURS OF DRAW.

3. If specimen will arrive > 24 hours of draw, spin down and send 1.0 mL of sodium citrate plasma FROZEN in plastic vial on dry ice.

Click here to view the Procedure for Collecting a Specimen from an A-line

Specimen Stability Information

Specimen Type: Plasma

Room Temp: 24 Hours

Add On Capable

Yes

Advance Beneficiary Notice Requirements

This test, when ordered on Medicare patients, is subject to the National Coverage Determination (NCD) policies. Please verify that the diagnosis code (ICD code) you have chosen demonstrates medical necessity for the test as documented in the physician’s patient record. The CMS web site is available to assist you with this verification. A properly executed Advance Beneficiary Notice (ABN) must be submitted with the specimen if medical necessity is not demonstrated by the ICD code chosen.

CPT Code Information

CPT Code	CPT Description	CPT Disclaimer
85610	Prothrombin Time

Keywords

PROTHROMBIN TIME (PT)

PROTIME

PT (PROTHROMBIN TIME)

PT / INR

Performing Laboratory Location