Well I find weird ways to remember things but this might stick with you to help you with values and to keep PT vs PTT. The book I happened to use had these values. So here we go... Remember PT as Pre-Teen and the age of a pre-teen is 11-13. INR I just have to remember 2-3 . This is the one they use for coumadin. Vit. K is the Antidote. PTT I remember as Prime Teaching Time is 25-35 which is the typical age for some of us that needed a break from school Before going back. This is the one they use for heparin. Protamine sulfate is the Antidote for this. Sorry if this method makes no sense to you, but it with a lot of my other crazy saying has gotten most of the critical numbers Remembered in the first 5 months of nursing school. But if it helps, awsome. Good luck with NCLEX