Can TCT detect trichomoniasis and fungal (e.g., candidal) infections?

TCT typically refers to the ThinPrep Cytologic Test, a type of cervical exfoliative cytology examination. During this procedure, a specially designed small brush is rotated several times at the cervical os to collect mucus from around the cervix; the sample is then smeared onto a glass slide and examined under a microscope to detect abnormal cellular changes in the cervix. Under normal circumstances, TCT can identify *Trichomonas vaginalis* (trichomonads) and fungal organisms (e.g., *Candida*), but interpretation must be performed under physician guidance. A detailed analysis follows:

In patients with trichomoniasis-associated vaginitis, cervical tissue may exhibit varying degrees of inflammatory response, potentially leading to morphological alterations in cervical cells that resemble atypical cells. Thus, an abnormal TCT result may serve as a clue suggesting possible trichomoniasis. Additionally, fungal elements may be present within cervical cells, and TCT may detect these organisms—though not directly. Instead, fungi are identified indirectly by observing characteristic abnormal cellular changes or fungal hyphae/spores in the specimen.

TCT has inherent limitations in detecting *Trichomonas* and fungi, as it does not directly target these pathogens. Rather, it infers their presence indirectly through observation of associated cervical cellular abnormalities. Therefore, for patients suspected of having trichomoniasis or fungal infection, additional laboratory tests (e.g., wet-mount microscopy, culture, or molecular assays) are recommended to confirm diagnosis.