 [ Symptoms ] can doctors mistakenly think a urine sample is contaminated when it is actually an illness  the nurse called and said my sample was contaminated by i know i cleaned thoroughly and did not touch the cup before during or after and i did a clean catch is it possible that a bacteria or something made it appear to be contaminated [ Disease ] here is a natural solution take cotton ball and dip it in a solution of apple cider vinegar squeeze the cotton lightly and wrap it in medicated gauze insert the gauze inside by keeping a part of it hanging from outside the vagina let the gauze remain in the vagina for 15 20 minutes