Partial Thromboplastin Time
0030235
Ordering Recommendation
Submit With Order
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.
Specimen Required
Patient Preparation
 
Collect
Lt. blue (sodium citrate).  
Specimen Preparation
Separate serum 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
Frozen.  
Unacceptable Conditions
Serum. Specimens refrigerated or at room temperature for greater than four hours. Clotted or hemolyzed specimens.  
Remarks
 
Stability
Ambient: 4 hours; Refrigerated: 4 hours; 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 Name
0030235Partial Thromboplastin Time
* 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.
Cross References
  • Activated Partial Thromboplastin Time
  • aPTT
  • Partial Thromboplastin Time
  • Partial Thromboplastin Time, Activated
  • PTT