Short answer
No. Consumer DNA tests estimate risk and report tendencies; they do not diagnose. A flagged risk should always be confirmed with a proper clinical test before anyone acts on it medically.
This is the single most important thing to understand before testing. A wellness or consumer test can suggest that your risk for something is above or below average, but it cannot tell you that you have or will get a condition. Diagnosis is a clinical act, made by a doctor using validated medical tests. Anything promising more than that is overstating what the science allows.