Ureaplasma urealyticum Antibody, IgG, Titer

Ureaplasma urealyticum Antibody, IgG, Titer (also called Anti-Ureaplasma urealyticum IgG or Ureaplasma urealyticum antibodies, IgG) assists in assessing prior exposure or immune response to Ureaplasma urealyticum. It is used as an adjunct when investigating suspected ureaplasma-related nongonococcal urethritis or cervicitis. Serology is interpreted alongside culture or nucleic acid amplification tests and the clinical presentation. It is not recommended as the sole basis for diagnosing active infection or for directing antimicrobial therapy.

Ureaplasma urealyticum belongs to the mycoplasma group and, together with Ureaplasma parvum, can cause human disease; however, colonization of the genital tract is frequent and often asymptomatic, particularly in sexually active women. Transmission occurs through sexual contact and perinatally. Ureaplasma is one of several pathogens that may underlie urethritis, along with Neisseria gonorrhoeae, Chlamydia trachomatis, Trichomonas vaginalis, and Mycoplasma genitalium. Clinical manifestations overlap across these etiologies, so laboratory testing is required to determine the cause. Following exposure, antibody responses evolve in sequence: IgM appears first, with class switching to IgG that persists for months to years and mediates secondary immune responses. The linkage between serologic titers and active disease is not well defined. As a result, IgG serology provides supportive rather than definitive evidence, and the presence of Ureaplasma does not invariably signify clinically significant infection.