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PT (Prothrombin Time)

SIM

20590 

CPT

85610 

Synonyms

Prothrombin time;  INR 

Specimen Type

Sodium Citrate Plasma 

Container

4.5 ml Sodium Citrate 3.2% Blue stopper tube

Collection Instructions

None

Volume

4 ml plasma 
Min: 2.0 ml 

Additional Information

Hemolysis does not effect this assay.

Patient Preparation

none

Specimen Processing Instructions

Centrifuge at 3380 rpm’s (±100) for 5 minutes.

Transport Requirements

Room Temperature

DO NOT REFRIGERATE OR FREEZE

Specimen Stability

Room Temperature Plasma: 24 hours

Room Temperature Whole Blood: 24 hours 

Rejection Criteria

• Refrigerated or Frozen sample

  • Clotted Sample 

•  Insufficient volume

Reference Range

·   INR = 2.0 – 3.0

·   PT = 12.7 - 15.1 seconds.  

Critical Value

INR = >4.5  

Test Includes

PT and INR 

Methodology

Electromagnetic mechanical clot detection system 

Testing Frequency

Daily, Monday - Sunday 

 

Reviewed By

Sandy Hammett 

Reviewed Date

3-16-18

Supplemental

 

Reviewed by Sandy Hammett on March 16, 2018

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