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Activated Partial Thromboplastin Time (PTT)
MessageIndicate time of last Heparin dose
Test Code
APTT
Preferred Specimen
Plasma, Full Tube Draw
Instructions
Deliver to Lab immediately. Draw a full tube, invert several times to mix blood
Transport Container
Light Blue top (3.2% sodium citrate) tube
Transport Temperature
Non-heparinized Specimens: Stable for 4 hours if at room temp. or refrigerated, spun or unspun, and must be capped. Heparinized specimens- Specimens should be centrifuged within 1 hour of collection and plasma tested within 4 hours from the time of collection.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
QNS, Clotted, Hemolyzed
Reference Range
See report for normal ranges. Critical Value: >120 sec
Clinical Significance
APTT is intended to screen for deficiencies in the intrinsic and common pathways (Factors VIII, IX, XI, XII, Fletcher, Fitzgerald, X, V, II, and I). It does not screen for Factors VII and XIII. The aPTT is also used to montitor unfractionated heparin therapy.
