I've seen several posts on here stating that you shouldn't urinate for atleast 1-2 hours before giving a urine sample. Well, I went to the urologist a few weeks back and gave a urine sample for a routine urinalysis when I first arrived. After about 30 minutes of waiting and being examined the doctor said he could do a urethral swab to test for chlamydia and gonnorrhea if I was concerned about it. I told him to go ahead but it had only been 20 to 30 minutes since I urinated. Would this ruin the test? Thanks.