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PTT
MessageTest performed at York Hospital Laboratory.
Test Code
PTT
Alias/See Also
Partial Thromboplastin Time
CPT Codes
85730
Preferred Specimen
Whole blood collected in a 3.2% sodium citrate (light blue-top) tube NOTE: This tube can also be used for in-house D-Dimer, Fibrinogen, and/or PT testing.
Other Acceptable Specimens
0.5 mL platelet-poor plasma collected in a 3.2% sodium citrate (light blue-top) tube, transferred to a plastic screw-cap vial
Instructions
Draw blood into light blue-top tube, filling tube to mark indicated on the tube. Do not overfill.
Transport Temperature
Frozen
Specimen Stability
Room temperature: 4 hours (2 hours if on heparin therapy) Refrigerated: Not recommended Frozen (plasma): 2 weeks Frozen (whole blood): unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed specimens. Refrigerated specimens.
Methodology
Clotting Assay
Setup Schedule
Daily
Report Available
Next Day
Available STAT 1/2 Hour
Available STAT 1/2 Hour
Reference Range
23.5-35.4 seconds Critical Values >123.0 seconds
Clinical Significance
This is a screening test for deficiencies of plasma coagulation factors other than Factors VII and XIII. This test is also used to monitor patients on heparin therapy.
