I'd like to cancel this standing order <a href=" http://www.habitoo.nl/what-is-the-purpose-of-ordering-a-dilantin-level-blood-test.pptx#fight ">phenytoin first order kinetics</a> I often ask my patients about their weight range when weighing daily (or weekly) at home. A rolling average of those numbers tends to be a more useful indicator of upward or downward trends than any single scale measurement in my office.