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In page Cervical intraepithelial neoplasia:

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A test for HPV called the Digene HPV test is highly accurate. It serves as both a direct diagnosis and an adjuvant to the Pap smear, which is a screening device that allows for an examination of cells but not tissue structure, needed for diagnosis. A colposcopy with directed biopsy is the standard for disease detection. Endocervical brush sampling at the time of Pap smear to detect adenocarcinoma and its precursors is necessary, along with doctor/patient vigilance on abdominal symptoms associated with uterine and ovarian carcinoma. The diagnosis of CIN or cervical carcinoma requires a biopsy for histological analysis.[citation needed]