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(Activated) Partial Thromboplastin Time
MessagePerformed in the Hematology Laboratory x5475, 76
Sample MUST be drawn to minimum fill line on tube
For monitoring LMWH, refer to Anti X-a test.
Sample MUST be drawn to minimum fill line on tube
For monitoring LMWH, refer to Anti X-a test.
Test Code
PTT
Alias/See Also
APTT
CPT Codes
85730
Preferred Specimen
plasma
Minimum Volume
2.7 mL. Sample MUST be drawn to minimum fill line on tube or the sample will be rejected as QNS.
Instructions
To prevent QNS sample draws: If the sodium citrate tube is the only sample to be collected with a butterfly collection device, draw a discard tube first OR
collect after drawing other samples.
collect after drawing other samples.
Transport Container
Light Blue Top (Sodium Citrate), 1.8 mL draw tube or 2.7 mL draw tube
Transport Temperature
Room Temperature
Specimen Stability
Stable Refrigerated: 4 hours
1 hour for monitoring heparin therapy
1 hour for monitoring heparin therapy
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly Hemolyzed, QNS, clotted
Methodology
Optical clot detection
Setup Schedule
24/7
Limitations
No interferences up to 500 mg/dL of hemoglobin, 1000 mg/dL triglycerides, and 26 mg/dL of bilirubin.
Results may be affected by many commonly administered drugs. Further studies should be made to determine the source of unexpected abnormal results.
Reference Range
25.7-35.7 seconds
Clinical Significance
Detection of coagulation factor deficiency (ies) in intrinsic and/or common pathways (congenital, aquired or liver disease), presence of inhibitor, and monitor unfractionated heparin therapy.
