How can Trichomoniasis be diagnosed?

Trichomoniasis diagnosis is most effectively accomplished through a microscopic examination of vaginal discharge or urine. This method involves looking for the Trichomonas vaginalis parasite under a microscope, which can be identified by its distinct shape and movement. This is a direct way to confirm the presence of the infection and is a standard practice in clinical settings for diagnosing sexually transmitted infections.

Blood tests, although useful for diagnosing certain kinds of STDs, are not effective for Trichomoniasis. Urinalysis for sugar is largely unrelated to identifying this infection; it is typically used to check for diabetes or urinary tract infections. Additionally, a CT scan is not a diagnostic tool for Trichomoniasis, as it is primarily used for imaging internal organs and tissues. Thus, the microscopic examination is the preferred diagnostic approach for this condition, making it the correct answer.