Why do people keep bringing up this point. Even blood tests are not perfect tools but we still make use of them. There are always some false positives and negat

Why do people keep bringing up this point. Even blood tests are not perfect tools but we still make use of them. There are always some false positives and negatives. It is a combination of all the available results that a doctor will use to make a determination. If your BMI is high but you look muscular, have normal BP and cholesterol and no other concerns, they may feel that you are in good health.