0030235
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Partial Thromboplastin Time

PTT
Example Reports
Critical
High
Normal

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

Lt. blue (sodium citrate).

Specimen Preparation

Separate plasma from cells ASAP or within 2 hours of collection and freeze. Transfer 1 mL platelet-poor plasma to an ARUP Standard Transport Tube.

Storage/Transport Temperature

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

Unacceptable Conditions

Serum. EDTA plasma, clotted or hemolyzed specimens.

Remarks
Stability

Ambient: 4 hours; Refrigerated: Unacceptable; Frozen: 2 weeks
NOTE: Specimens from patients on heparin must be centrifuged within 1 hour of collection and ambient stability is reduced to 2 hours.

Methodology

Electromagnetic Mechanical Clot Detection

Performed

Sun-Sat

Reported

1-2 days

Reference Interval

24-35 seconds

Interpretive Data



Compliance Category

FDA

Note

Reference interval established using 3.2% sodium citrate.

Hotline History

N/A

CPT Codes

85730

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Components

Component Test Code* Component Chart Name LOINC
0030235 Partial Thromboplastin Time 14979-9
* 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

  • Activated Partial Thromboplastin Time
  • aPTT
  • Partial Thromboplastin Time
  • Partial Thromboplastin Time, Activated
  • PTT
Partial Thromboplastin Time