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Test Code PT PT (PROTHROMBIN TIME)

Aliasis

PT/INR, Prothrombin time

Patient Preparation

No special patient preparation required

Special Collection Instructions

Properly filled 9:1 ratio (blood to anticoagulant)

Collection Method

Venous collection; properly filled 9:1 ratio (blood to anticoagulant)

Minimum Volume

0.5 mL of plasma from a properly filled 1.8 mL or 2.7 mL NaCitrate (light blue) tube

Container

Light Blue Sodium Citrate

Preferred Specimen

2.7 mL Lt Blue (3.2% NaCitrate)

Acceptable Specimen(s)

1.8 mL Lt Blue (3.2% NaCitrate tube)

Reference or Target Ranges

9.2 – 11.7 seconds

Orthopedic Protocol: 1.8 – 2.5 seconds

Standard Hospital Protocal: 2.0 – 3.5 seconbs

Reportable Units

Seconds

Critical Value

INR:

>5.00 seconds

Reasons for Rejection

Other:                

Short draws, Over draws, Clotted, Improperly labeled

Specimen Stability

Plasma

 

Ambient:                

4 Hours

Clinics only:

24 Hours whole blood

Frozen:

2 weeks

Performance Information

Days and Time Performed

24/7

Expected Turn Around Time

Stat: 1 Hour, Routine: 4 Hours

Stat Availability

Yes

Performing Bench

CRMC Coag

Methodology/Method Description

CS - 2500

Methodology/Method Description

The CS-2500 employs the photo-optical detection method.

CPT Codes

85610