How to Improve STI Test Accuracy – Swab or Urine?
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Vaginal swabs are more accurate than urine samples in diagnosing Chlamydia trachomatis, Neisseria gonorrhoeae, and Trichomonas vaginalis. These results support CDC recommendations that vaginal swabs are the preferred sample modality when testing for STIs in women.
Source
Vaginal Swab vs Urine for Detection of Chlamydia trachomatis, Neisseria gonorrhoeae, and Trichomonas vaginalis: A Meta-Analysis. Ann Fam Med. 2023 Mar-Apr;21(2):172-179. doi: 10.1370/afm.2942.