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Prothrombin Time

PT
Example Reports
Critical
High
Low
Normal

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Specimen Collection and Handling

Ordering Recommendation

Initial test for suspected bleeding disorder.

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation
Collect

Light Blue (Sodium Citrate). Special Specimen Collection and Handling Hemostasis/Thrombosis Specimens guide located at https://www.aruplab.com/Specimen-Handling/SpecialSpecimenCollection/Hemostasis-Thrombosis.pdf.

Specimen Preparation

Transfer 1 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature

CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Unacceptable Conditions

Serum or EDTA plasma. Clotted or hemolyzed specimens.

Remarks
Stability

Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 2 weeks
University of Utah Clients: Ambient: 24 hours; Refrigerated: Unacceptable; Frozen: 2 weeks

Methodology

Electromagnetic Mechanical Clot Detection

Performed

Sun-Sat

Reported

1-2 days

Reference Interval

12.0-15.5 seconds

Interpretive Data



Compliance Category

FDA

Note

Reference intervals established using 3.2% sodium citrate.

Hotline History

N/A

CPT Codes

85610

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Components

Component Test Code* Component Chart Name LOINC
0030220 Prothrombin Time 5902-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • PT
  • Prothrombin Time, Plasma
  • Protime
Prothrombin Time