STD Testing question

[Hypochondriac1523]

Hi,

I recently started a 5 day course of zithromax for a possible sinus infection. I took the first 2 pills on Wed 6/19. However because of my gf recently getting a UTI following sex i began to think one of us had Chlamydia or Gonorhea. Her symptoms were that of a UTI and her urine culture confirmed this. However i got tested for  Chlamydia or Gonorhea Thursday 6/20 and the results came back negative. I was only on the first dose of Zpak for about 12 hours. Would this skew the test results? As an fyi i don't have any symptoms or have not had any symptoms of both STDs and haven't had sex with anyone but my current GF for the last 5+ months. Thanks in advance.

[Edward W Hook, MD]

Yes, the same answer is applicable for gonorrhea and does pertain to BD's Probetec Assay.   EWH

[Hypochondriac1523]

Also i assume the same goes for the test for Gonorhea?

[Hypochondriac1523]

Hi Dr. Hook. Thank you for the quick response. You do have my question correct. The test that was done was BD Probetec Amplified DNA Assays.  

[Edward W Hook, MD]

Welcome to our Forum. I hope I understand your question correctly.  You would like to know if having taken 2 250mg azithromycin pills would cause your urine chlamydial test to be negative if you had taken the azithromycin 12 hours before being tested for chlamydia. The answer is no.  The tests for chlamydia test for chlamydial DNA so even if there were dead or dying chlamydia present, they would have been detected.  You should believe the results of your test.  EWH

[Hypochondriac1523]

I'd also like to add the dosage for the Zpak was 250 mg pills. So the first dose was 2 pill at 250 mg each.