From Darren:

The testing continues as the Doctors are trying to narrow down the cause of Karen's illness. The flow of information is in an almost constant state of change as they still aren't certain what's going on. There are discussions of educated guesses but no definitive answers yet. As you can imagine this is, at times, very overwhelming for Karen. Please continue to pray for complete healing of Karen's body, peace for her as the testing continues and wisdom for the doctors. While we're still not certain what's going on with Karen, we know that God is in control.