hi, again: i had a gastric bypass 18 years ago. Absorption of nutrients and meds is compromised. I have afib since 2007 and supposed to take an anticoagulant due to: female, over 65, high blood pressure (controlled by lisinopryl). After researching for a long time i started taking Eliquis. My cardio prefers Warfarin, since you can monitor therapeutic range and there is an antidote. Research and doctors say there are no reliable monitoring tests for Eliquis, and no research on bariatric surgery effects on anticoagulants. There is no research on obese patients either, which might affect the appropriate dosage. The big trials that got these drugs approved have decided on a 'one size fits all' approach. My question here, to whoever might be taking eliquis or xarelto, is whether you have been given any blood tests to determine that your system is absorbing and metabolizing the medication and whether you are in 'therapeutic range.' There are some tests but they are not 'recommended for monitoring.' I've been taking Eliquis for 3 weeks and i have no side effects -- no bruising, no cut fingers bleeding longer, nothing. So right now, i have no idea if the stuff is even getting into my system. Any information or experience anyone might share is appreciated. Thanks.