We have our criticals starting at the top of our therapeutic range for APTTs. I was wondering how other labs set thiers. If we are only one second outside the range, we have to make a critical call.

Scott

Yep--that is same here for ALL therapeutic drugs.

At our hospital we have to call all heparin protocol aPTTs critical or not. Our critical aPTT is based on our heparin protocol curve.