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Partial Thromboplastin Time
0030235
Ordering Recommendation

Initial test for suspected bleeding disorder.

Mnemonic
PTT
Methodology
Electromagnetic Mechanical Clot Detection
Performed
Sun-Sat
Reported
1-2 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
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 
Reference Interval
24-35 seconds
Interpretive Data


Note
Reference interval established using 3.2% sodium citrate.
CPT Code(s)
85730
Components
Component Test Code*Component Chart NameLOINC
0030235Partial Thromboplastin Time14979-9
* 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