INR AND PTT, GROUP TEST - NorDx Test Catalog

Additional Codes

Software	Test Code
Label Text	COAG
EPIC	LAB510519

Performing Laboratory

NorDx Laboratories

Useful For

Group test to facilitate collecting one tube and freezing the plasma when PT and PTT are both ordered.

Method Name

Clot-Based Assay

Reference Values

See individual analytes

Days and Times Test Performed

Monday through Sunday

Report Available

1 Day

Profile Information

Individual Test Description
PARTIAL THROMBOPLASTIN TIME (PTT), PLASMA
PROTHROMBIN TIME (PT), INR, PLASMA

Specimen Type

Plasma

Preferred Container

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

Preferred Volume

Plasma: 1 mL (Light Blue Top Tube (Sodium Citrate)) – per aliquot

Minimum Volume

Plasma: 0.5 mL (Light Blue Top Tube (Sodium Citrate))

Specimen Collection and Handling

1. Separate plasma from cells within 4 hours of collection in a centrifuge at 2,500 rpm for 15 minutes or 3,000 rpm for 10 minutes.

2. Using a plastic transfer pipette (do not use a glass pipette) transfer the plasma to a screw-capped, plastic (polypropylene) vial. (Glass vials will not be accepted.)

3. Spin the specimen again at the speeds mentioned above.

4. Using a plastic transfer pipette (do not use a glass pipette), divide the specimen into as many 0.5-1.0 mL aliquots as possible and cap the vial(s) tightly.

5. Freeze specimen(s) immediately at = – 40º C.

6. Send specimen(s) frozen on dry ice.

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

Specimen Stability Information

Specimen Type: Plasma

Refrigerated: 4 Hours

Must be spun/separated within: 4 Hours

Note: 2 Weeks (-20° C) or Indefinitely (-70° C). Frozen Note: To store/freeze @ -70°C and specimen must be double spun/ aliquoted prior to storage.

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
85730	Thromboplastin Time, Partial (PTT), Plasma or Whole Blood

Performing Laboratory Location