I had a doctor that put a notation in my charts "adult BMI 21-21.9" under the problems section. I lost a little weight after that, which caused the doctor's office to freak out more. Imagine how they would have flipped if they if used a BMI calculator that's more accurate for height extremes so they knew I'm actually closer to 19?  Even some doctors don't know what healthy looks like any more. It's pathetic.