Cervical Cancer Screening Tests Explained

Screening tests for cervical cancer are designed to be applied to large numbers of asymptomatic women to detect precancerous or early cancerous changes before they cause symptoms. A true screening test must be simple, inexpensive, safe, and suitable for population-level use. Diagnostic procedures, by contrast, are used only after a screening test is positive, to confirm and characterize a lesion, and are not used as primary screening tools.

Why 1, 2 and 3 (Option 3) is Correct

• Pap test (1): The Papanicolaou (Pap) smear is the classic, widely used cervical cancer screening test. It involves collecting exfoliated cervical cells and examining them cytologically for dysplastic or malignant changes. It is recommended as a routine screening tool in women of appropriate age groups.
• HPV DNA test (2): Since persistent infection with high-risk Human Papillomavirus (HPV) types is the central cause of cervical cancer, HPV DNA testing is an established primary screening method (used alone or co-tested with the Pap smear) to identify women at higher risk who need further evaluation.
• Visual inspection with acetic acid, VIA (3): VIA is a low-cost, low-resource screening technique in which dilute acetic acid is applied to the cervix; abnormal (dysplastic) areas turn aciowhite and can be seen with the naked eye. It is widely used as a primary screening tool in low-resource settings, including in national screening programs in India.

Together, the Pap test, HPV DNA test, and VIA form the recognized triad of population-based cervical cancer screening methods, making 1, 2 and 3 the correct combination.

Why Endocervical Curettage (4) is Excluded

• Endocervical curettage (ECC): ECC is a diagnostic, not a screening, procedure. It is performed during colposcopy to sample the endocervical canal (a region not directly visualized by colposcopy) specifically when a screening test (Pap/HPV/VIA) has already come back abnormal. Because it requires a clinical procedure and is used only for follow-up evaluation of already-flagged cases, it does not qualify as a screening test.

Why the Other Options are Incorrect

• Option 1 (1, 3 and 4): Incorrectly includes ECC (a diagnostic test) while omitting HPV DNA testing, which is a valid screening method.
• Option 2 (1, 2 and 4): Incorrectly includes ECC and omits VIA, one of the standard screening tools.
• Option 4 (2, 3 and 4): Incorrectly includes ECC and omits the Pap test, the original and most established screening method.

Hence, the correct answer is 1, 2 and 3 (Pap test, HPV DNA test, and Visual inspection with acetic acid).