I agree with another review that these strips are faulty... definitely not reliable, from my experience! I just ordered them a couple of months ago and was sent a bottle that was already at the end of their shelf life. They expire in mere days. I've checked my pH for a long time with other strips and so I know it fluctuates from day to day. These strips, however, never show ANY variation in my pH. Therefore, I can't presume anything at all about ketone bodies either. Not worth the expense, to be sure.