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HelpTest Code PTT Activated Partial Thromboplastin Time
Performing Laboratory
YRMC, Coagulation
Day(s) Test Set Up
Monday through Sunday
Specimen Requirements
Light Blue Top (3.2% Sodium Citrate) –Whole blood
A minimum of 90% fill is recommended.
Hemolyzed or partially filled tubes are unacceptable
Order of Draw
Specimen Transport Temperature
Stability- Up to 4 hours from the time of collection when stored at ambient temperature.
Unit of Measure
Unit: Seconds
CPT Coding
85730
Collection Instructions
Ratio of anticoagulant (present in the collection tube) to blood collected is very critical in coagulation studies. Check and collect the correct volume of blood as guided in collection tube label.
The etched minimum fill indicator represents the minimum volume of blood required for analysis. Immediately after the draw, gently invert the tube 3 to 4 times.
Methodology
Photo-optical clot detection
Patient Preparation
No special patient preparation is necessary.
Useful For
Monitoring heparin therapy (unfractionated heparin).
Screening for certain coagulation factor deficiencies and abnormalities (eg, factor VIII, IX, XI or XII).
Detecting coagulation inhibitors such as lupus anticoagulant, antiphospholipid antibodies, specific factor inhibitors, and nonspecific inhibitors.