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Test ID BLOD0669 Prothrombin Time

AKA

PT, Protime, INR

Specimen Type/Requirements

Blue top (Sodium Citrate) tube -  Plasma (preferred)

 

See  Coagulation Testing and Platelet Poor Plasma Preparation

        
Blue top (Sodium Citrate) tube - Whole Blood (Stable 24 hours Room Temperature Only)

 

The 3.2% Sodium Citrate tube must be filled to appropriate volume to acquire the 9:1 blood to anticoagulant ratio that is critical for valid results.

 

Test is affected by hemolysis.  Test is not affected by lipemia.

Specimen Volume

 Preferred Volume     2.0 mL   
 Minimum Volume     0.7 mL   

 

Stability/Transport

Sodium Citrate Plasma:

 Room Temperature     8 hours     
 Refrigerated     Not Acceptable     
 Frozen     14 days     Preferred for transport   

Sodium Citrate Whole Blood:

 Room Temperature     24 hours     Preferred for transport   
 Refrigerated     Not Acceptable     
 Frozen     Not Acceptable     

 

Performed Test Frequency

Monday through Sunday

Methodology

Mechanical Clot Detection

Performing Lab

Sanford Laboratories Sioux Falls
Sanford Laboratories Rapid City

CPT

85610