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Test Code LAB4255 PROTIME

Important Note

Fill tube completely to maintain correct Anticoagulant/Blood ratio

Specimen Type

Blue top tube (buffered 3.2% liquid sodium citrate) filled to the indicator with whole blood or Sodium Citrate Plasma removed from cells.

Specimen Volume

3mL Blue top (3.2% Sodium Citrate), or

5mL Blue top (3.2% Sodium Citrate), or

1mL Blue top (3.2% Sodium Citrate) MiniCollect vial, or

500uL (minimum) Sodium Citrate Plasma spun and removed from cells.

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Room Temp:  24 hours

Specimen Processing

Liquid blue top tube filled to capacity. Must be performed within 24 hours of collection.

Method

Electromechanical

Reference Ranges

PT 11.6 – 14.7 seconds

INR 0.9-1.2

2.0-3.0 Usual oral anticoagulation range.

2.5-3.5 High level oral anticoagulation range.

Synonyms

Prothrombin Time; PT

Test Components

PT, sec; INR.

CPT Codes

85610

Rejection Criteria

Clotted specimens or improperly filled liquid blue top tube.

If a patients Hematocrit is >55% the coagulation tube must have the amount of anticoagulant adjusted. Call the lab for an adjusted tube. (Note: Tubes with anticoagulant adjusted must be drawn in a syringe and filled manually as the tube vacum will be compromised in the process.)