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What Result Triggers a PTT Mix?

From Heather DeVries, Indiana University Health, “I answered the current Quick Question saying that we use another decision limit for doing a PTT mixing study. We require that the PTT be >3.0 seconds
prolonged beyond the upper limit of our reference range, which is is 38.0 seconds.

Thank you, Heather, there seems to be great variety in the decision limits.

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