PTT is it 1.5-2.5 or 1.5 to 2?

  1. 0
    I always thought it was 1.5-2.5Xcontrol. Exam cram says 1.5-2X control.

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  2. 5 Comments...

  3. 0
    Anyone know the correct one?
  4. 0
    Are you sure you're not referring to the INR? I believe normal PTT is 25-30 seconds. I think normal PT(not PTT) is somewhere between 0.9-1.5. And normal INR is between 2-3 therapeutically. We don' give Coumadin if unless the INR is less than 3 at our hospital. Maybe you misread the question????? Of course, everything varies depending on the lab running the test but it still should be pretty much standard range.

    PTT is sometimes referred to as Anti Xa (read as "anti 10a"). I would have another look at the question if I were you.
  5. 0
    aPTT 20-36 Seconds- Therapeutic range 1.5-2.5 times normal (if longer than 90 seconds, pt at risk of bleeding)

  6. 0
    Confusing part-

    saunders says, PT value within 2 seconds (plus or minus) of the control is considered normal..... but then in the values section it says... PT 9.6-11.8 (male) 9.5-11.3 (female) is normal...

    (PT higher than 30 at risk of bleeding)

    im wondering if by the 2 seconds they mean 2 seconds of the range??

    INR 2-3 for standard warfarin (coumadin) therapy

    INR 3-4.5 High dose warfarin therapy.
  7. 0
    I did look in Saunders. It says therapeutic level is 1.5-2.5x control for PTT-heparin and 1.5-2xcontrol for PT-warfarin.

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