{ "id": "ep7kbpxega", "slug": "cotesting", "title": "Cotesting", "updated": "2026-10-21", "topic_path": [ { "id": "life", "label": "Life and health", "api_url": "https://www.edgepedia.org/api/v1/topics/life" }, { "id": "life.health", "label": "Human health and medicine", "api_url": "https://www.edgepedia.org/api/v1/topics/life.health" }, { "id": "life.health.public", "label": "Public health and healthcare", "api_url": "https://www.edgepedia.org/api/v1/topics/life.health.public" }, { "id": "life.health.public.epidemiology-discipline", "label": "Epidemiology as a discipline", "api_url": "https://www.edgepedia.org/api/v1/topics/life.health.public.epidemiology-discipline" } ], "geo": [ { "id": "geo.nongeo.t1946.life.health.public.epidemiology-discipline", "label": "Non-geographic · 1946 to 2000: Epidemiology as a discipline", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life.health.public.epidemiology-discipline", "path": [ { "id": "geo.nongeo", "label": "Non-geographic", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo" }, { "id": "geo.nongeo.t1946", "label": "Non-geographic · 1946 to 2000", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946" }, { "id": "geo.nongeo.t1946.life", "label": "Life and health", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life" }, { "id": "geo.nongeo.t1946.life.health", "label": "Human health and medicine", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life.health" }, { "id": "geo.nongeo.t1946.life.health.public", "label": "Public health and healthcare", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life.health.public" }, { "id": "geo.nongeo.t1946.life.health.public.epidemiology-discipline", "label": "Epidemiology as a discipline", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.nongeo.t1946.life.health.public.epidemiology-discipline" } ] } ], "excerpt": "Cotesting is a cervical cancer screening strategy combining HPV testing and the Pap test on the same specimen, recommended every 5 years for women aged 30 to 65.", "snippet": "Cotesting is a cervical cancer screening strategy combining HPV testing and the Pap test on the same specimen, recommended every 5 years for women aged 30 to 65.", "node": "life.health.public.epidemiology-discipline", "markdown": "# Cotesting\n\nCotesting is a cervical cancer screening strategy in which human papillomavirus (HPV) testing and cervical cytology (the [Pap test](https://www.edgepedia.org/pap-test)) are performed on the same cervical specimen at the same visit.[1](https://www.uptodate.com/contents/cervical-cancer-screening-tests-techniques-for-cervical-cytology-and-human-papillomavirus-testing) It answers a specific clinical question: after a single screen, how likely is a woman to have or develop cervical precancer or cancer before her next screen? For women aged 30 to 65, United States guidelines have historically offered cotesting every 5 years as one of three acceptable strategies, alongside cytology alone every 3 years and primary [HPV testing](https://www.edgepedia.org/hpv-testing) alone every 5 years.[2](https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/cervical-cancer-screening?ds=1)\n\n| Key fact | Detail |\n|---|---|\n| Definition | Same-visit high-risk HPV testing plus cervical cytology, usually on one specimen[1](https://www.uptodate.com/contents/cervical-cancer-screening-tests-techniques-for-cervical-cytology-and-human-papillomavirus-testing) |\n| Sensitivity for ≥CIN3 | 98.8% for cotesting vs 94% HPV-only and 91.3% Pap-only in a 256,648-woman US cohort[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC4654274/) |\n| Cancer incidence rate during 5-year follow-up after a negative result | 3.2 per 100,000 woman-years after negative cotest vs 7.5 after Pap-negative[4](https://www.thelancet.com/journals/lanonc/article/PIIS1470-2045%2811%2970145-0/abstract) |\n| Recommended interval | Every 5 years, ages 30–65 (USPSTF)[2](https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/cervical-cancer-screening?ds=1) |\n| Main harm | Highest false-positive rate of the three screening strategies[2](https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/cervical-cancer-screening?ds=1) |\n| Predictive value | Lowest PPV for CIN2+ (10.71%) among four strategies in a 33,387-woman Chinese cohort[5](https://www.nature.com/articles/s43856-026-01467-z) |\n| Current US status | Acceptable but transitional; primary HPV testing is preferred (ACS 2020[6](https://pubmed.ncbi.nlm.nih.gov/32729638), ACOG 2026[7](https://www.acog.org/clinical/clinical-guidance/committee-statement/articles/2026/07/screening-for-cervical-cancer)) |\n\n## How it works\n\nThe two tests examine different things. High- and intermediate-risk HPV types, acting with cofactors, cause over 90% of cervical cancers worldwide, and HPV DNA testing was articulated as a needed adjunct to the subjective, error-prone Pap smear.[8](https://doi.org/10.1111/j.1447-0756.1996.tb01081.x)\n\nCombining the two with an either-positive (OR) rule, a positive result on either test makes the cotest positive, with follow-up determined by risk-based management guidelines; colposcopy is recommended only when the result combination and history meet the referral threshold, and this rule maximizes sensitivity at a specificity cost. A network meta-analysis of 27 prospective paired-design studies (185,269 women) found the OR-rule combination of cytology and hrHPV testing was the most sensitive and least specific strategy, while the both-positive (AND) rule was the most specific and least sensitive.[9](https://www.nature.com/articles/s41598-021-04201-y) The two components are partly redundant: in the Kaiser Permanente Northern California (KPNC) cohort, abnormal cytology raised 5-year CIN3+ risk substantially only among HPV-positive women (12.1% vs 5.9%), not HPV-negative women.[4](https://www.thelancet.com/journals/lanonc/article/PIIS1470-2045%2811%2970145-0/abstract)\n\nQuantitative comparisons against each single test vary by population and endpoint. In a US cohort of 256,648 women aged 30–65, positive cotests were more sensitive for ≥CIN3 than positive HPV-only tests (98.8% vs 94%) or Pap-only tests (91.3%), but less specific (10.9% vs 25.6% and 26.3%).[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC4654274/) Published comparisons disagree on whether cotesting detects materially more disease than HPV alone: the MARZY investigators found equivalent relative sensitivity and concluded cotesting offers no detection benefit over stand-alone HPV testing,[10](https://pubmed.ncbi.nlm.nih.gov/33187968/) while the US Quest cohort found higher sensitivity and fewer missed cancers for cotesting.[3](https://pmc.ncbi.nlm.nih.gov/articles/PMC4654274/)\n\n## How it is done\n\nMost often the same specimen is used for both cytology and HPV testing; two separate collections are not required.[1](https://www.uptodate.com/contents/cervical-cancer-screening-tests-techniques-for-cervical-cytology-and-human-papillomavirus-testing) Cells are obtained from the ectocervix and the endocervix to evaluate the transformation zone, the area at greatest risk for neoplasia.[1](https://www.uptodate.com/contents/cervical-cancer-screening-tests-techniques-for-cervical-cytology-and-human-papillomavirus-testing) [Liquid-based cytology](https://www.edgepedia.org/liquid-based-cytology) made the single-specimen approach practical, because residual cellular material suspended in the collection tube can be used for HPV DNA testing.[11](https://doi.org/10.1053/ob.1996.v175.a73868) The same cervical scrape can likewise be used for HPV testing and liquid-based cytology.[12](https://europepmc.org/articles/PMC2363679)\n\nThe HPV component uses an FDA-approved assay. The cobas HPV test, for example, is a qualitative real-time PCR assay detecting 14 high-risk genotypes with a β-globin internal control.[13](https://www.accessdata.fda.gov/cdrh_docs/pdf19/P190028C.pdf) It is validated only for clinician-collected cervical specimens in ThinPrep PreservCyt solution.[13](https://www.accessdata.fda.gov/cdrh_docs/pdf19/P190028C.pdf)\n\n## Origin\n\nThe enabling technology was the Hybrid Capture HPV DNA assay, described by Attila T. Lörincz in 1996 as a tool for managing equivocal Pap smears and for population screening.[8](https://doi.org/10.1111/j.1447-0756.1996.tb01081.x) The combined single-specimen approach was validated in the same year, when Ferenczy and colleagues showed that ThinPrep liquid-based cytology plus Hybrid Capture HPV testing correctly identified 95.1% of women with high-grade lesions and invasive cancer.[11](https://doi.org/10.1053/ob.1996.v175.a73868) In 1999, Manos and colleagues reported HPV testing sensitivity of 89.2% for identifying women with HSIL+ among those with equivocal Papanicolaou results.[14](https://jamanetwork.com/journals/jama/fullarticle/189716) Randomized validation came from two 2007 trials: CCCaST, by Mayrand and colleagues,[15](https://doi.org/10.1056/nejmoa071430) and Swedescreen, by Nauclér and colleagues, which detected 51% more CIN2+ at baseline in the intervention arm, with a 47% reduction in subsequent CIN3+ and cancer.[16](https://doi.org/10.1056/nejmoa073204) USPSTF, ACS, ASCCP, and ASCP recommended cotesting for women aged 30 and over in 2012–2013,[17](https://pmc.ncbi.nlm.nih.gov/articles/PMC8405560/) and the relative performance of the two components was later dissected in the KPNC cohort by Schiffman and colleagues in 2017.[18](https://doi.org/10.1093/jnci/djx225)\n\n## Variants\n\nA triage option is p16/Ki-67 dual-stain cytology, approved by the FDA in March 2020 (CINtec PLUS Cytology, Roche) for triage to inform management of individuals with positive HPV results. HPV-positive, dual-stain-positive results carry an immediate CIN3+ risk of 9.5%, meeting the colposcopy threshold, while dual-stain-negative results carry 0.75% immediate risk and meet 1-year return criteria; modeling suggests dual-stain triage of cotesting yields 11% fewer total colposcopies than cotesting alone.[19](https://journals.lww.com/jlgtd/fulltext/2024/04000/recommendations_for_use_of_p16_ki67_dual_stain_for.2.aspx) Self-collected vaginal specimens for HPV testing are a separate development addressed in recommendations from the Enduring Consensus Cervical Cancer Screening and Management Guidelines Committee by Wentzensen and colleagues in 2025;[20](https://doi.org/10.1097/lgt.0000000000000885) ACOG supports patient-collected primary hrHPV screening every 3 years, not 5, because data supporting 5-year self-collection intervals are lacking.[7](https://www.acog.org/clinical/clinical-guidance/committee-statement/articles/2026/07/screening-for-cervical-cancer)\n\n## Applications\n\nCotesting is used in the United States for cervical screening.[17](https://pmc.ncbi.nlm.nih.gov/articles/PMC8405560/) The 2012 USPSTF recommendation offered cotesting every 5 years for women aged 30–65 who wanted a longer interval than 3-year cytology.[21](https://www.acpjournals.org/doi/10.7326/0003-4819-156-12-201206190-00424) Uptake was substantial: in [New Mexico](https://www.edgepedia.org/new-mexico), the share of screening tests that were co-tests among women 30–64 with negative cytology rose from 5.6% in 2008 to 84.3% in 2019, and the median screening interval lengthened from 15 to 39 months as the guidelines were adopted.[17](https://pmc.ncbi.nlm.nih.gov/articles/PMC8405560/) ASCCP guidelines restrict HPV testing to high-risk types and deem HPV testing unacceptable for screening women aged 21–29.[22](https://asccp.org/wp-content/uploads/2025/09/ASCCP-Management-Guidelines_August-2014.pdf)\n\nThat position has since shifted toward primary HPV testing. The ACS 2020 guideline made primary HPV testing every 5 years the preferred strategy for ages 25–65, keeping cotesting only as an acceptable transitional option where primary HPV testing is unavailable.[6](https://pubmed.ncbi.nlm.nih.gov/32729638) The WHO recommended HPV DNA testing as the preferred primary test in 2021.[5](https://www.nature.com/articles/s43856-026-01467-z) [British Columbia](https://www.edgepedia.org/british-columbia)'s screening program transitioned from cytology to primary HPV screening in January 2024.[23](https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2846208) In 2026, ACOG endorsed primary clinician-collected hrHPV screening every 5 years for ages 30–65, with cotesting every 5 years acceptable when primary HPV testing is unavailable or chosen after counseling.[7](https://www.acog.org/clinical/clinical-guidance/committee-statement/articles/2026/07/screening-for-cervical-cancer)\n\n## Limitations and alternatives\n\nThe main harm is false positivity. USPSTF reviews found cotesting has the highest false-positive rate among the three strategies,[2](https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/cervical-cancer-screening?ds=1) with first-round rates of 5.8–19.9% versus 2.6–6.5% for cytology.[24](https://www.uspreventiveservicestaskforce.org/uspstf/document/evidence-summary/cervical-cancer-screening) In a Chinese trial, cotesting caused a fourfold increase in colposcopies versus cytology alone (10.6% vs 2.4%).[25](https://onlinelibrary.wiley.com/doi/10.1002/ijc.32861)\n\nAgainst primary HPV screening, the extra yield is small and the extra burden is not. A 2024 JNCI analysis across four US settings (>2.6 million individuals) found the additional CIN3+/cancer immediately detected by cotesting fell from 71 per 100,000 screened in never or rarely screened populations to 4 per 100,000 in those with prior HPV-negative results, while cotesting required 86,000–96,000 more lab tests and 200–500 more colposcopies per 100,000 screened; the authors concluded cotesting has an unfavorable benefit-to-harm ratio, especially at low precancer prevalence.[26](https://www.ovid.com/journals/jnci/fulltext/10.1093/jnci/djae117~primary-human-papillomavirus-testing-vs-cotesting-clinical) Cotesting is also inherently more costly than primary HPV screening because cytology is an additional, labor-intensive test.[23](https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2846208) In a 33,387-woman Chinese cohort, cotesting versus HPV primary screening with cytology triage detected 6.7 versus 6.5 CIN2+ cases per 1,000 screened (95% CI −1.08 to 1.38), while requiring 33.1 additional colposcopy referrals and 888.8 additional liquid-based cytology slides per 1,000 women; cotesting had the lowest PPV (10.71%) and the highest false-positive proportion, with at least 84% of biopsied lesions being ≤CIN1.[5](https://www.nature.com/articles/s43856-026-01467-z)\n\n## References\n\n1. [Cervical cancer screening tests: Techniques for cervical cytology and human papillomavirus testing - UpToDate](https://www.uptodate.com/contents/cervical-cancer-screening-tests-techniques-for-cervical-cytology-and-human-papillomavirus-testing)\n2. [Cervical Cancer: Screening | USPSTF Recommendation](https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/cervical-cancer-screening?ds=1)\n3. [Comparison of Cervical Cancer Screening Results Among 256,648 Women in Multiple Clinical Practices (Quest Diagnostics Health Trends)](https://pmc.ncbi.nlm.nih.gov/articles/PMC4654274/)\n4. [abstract (thelancet.com)](https://www.thelancet.com/journals/lanonc/article/PIIS1470-2045%2811%2970145-0/abstract)\n5. [Minimal benefit of co-testing over HPV primary screening with cytology triage from resource-limited settings in China (Communications Medicine, 2026)](https://www.nature.com/articles/s43856-026-01467-z)\n6. [Cervical cancer screening for individuals at average risk: 2020 guideline update from the American Cancer Society](https://pubmed.ncbi.nlm.nih.gov/32729638)\n7. [Screening for Cervical Cancer | ACOG Committee Statement (2026)](https://www.acog.org/clinical/clinical-guidance/committee-statement/articles/2026/07/screening-for-cervical-cancer)\n8. [Attila T. Lörincz (1996). Hybrid Capture™ Method for Detection of Human Papillomavirus DNA in Clinical Specimens: A Tool for Clinical Management of Equivocal Pap Smears and for Population Screening. Journal of obstetrics and gynaecology research.](https://doi.org/10.1111/j.1447-0756.1996.tb01081.x)\n9. [Comparative accuracy of cervical cancer screening strategies in healthy asymptomatic women: a systematic review and network meta-analysis (Scientific Reports)](https://www.nature.com/articles/s41598-021-04201-y)\n10. [Cervical Cancer Screening: Comparison of Conventional Pap Smear Test, Liquid-Based Cytology, and HPV Testing as Stand-alone or Cotesting Strategies (MARZY cohort, Cancer Epidemiol Biomarkers Prev 2021)](https://pubmed.ncbi.nlm.nih.gov/33187968/)\n11. [Ferenczy and colleagues (1996). Diagnostic performance of Hybrid Capture human papillomavirus deoxyribonucleic acid assay combined with liquid-based cytologic study. American Journal of Obstetrics and Gynecology.](https://doi.org/10.1053/ob.1996.v175.a73868)\n12. [Human papillomavirus testing in primary screening for the detection of high-grade cervical lesions: a study of 7932 women (Clavel et al., Br J Cancer 2001)](https://europepmc.org/articles/PMC2363679)\n13. [cobas HPV Package Insert (P190028), FDA](https://www.accessdata.fda.gov/cdrh_docs/pdf19/P190028C.pdf)\n14. [Identifying Women With Cervical Neoplasia: Using Human Papillomavirus DNA Testing for Equivocal Papanicolaou Results (Manos et al., JAMA 1999)](https://jamanetwork.com/journals/jama/fullarticle/189716)\n15. [Marie-Hélène Mayrand and colleagues (2007). Human Papillomavirus DNA versus Papanicolaou Screening Tests for Cervical Cancer. New England Journal of Medicine.](https://doi.org/10.1056/nejmoa071430)\n16. [Pontus Naucler and colleagues (2007). Human Papillomavirus and Papanicolaou Tests to Screen for Cervical Cancer. New England Journal of Medicine.](https://doi.org/10.1056/nejmoa073204)\n17. [Uptake of Co-testing with HPV and Cytology for Cervical Screening: A population-based evaluation in the United States (New Mexico)](https://pmc.ncbi.nlm.nih.gov/articles/PMC8405560/)\n18. [Mark Schiffman and colleagues (2017). Relative Performance of HPV and Cytology Components of Cotesting in Cervical Screening. JNCI Journal of the National Cancer Institute.](https://doi.org/10.1093/jnci/djx225)\n19. [Recommendations for Use of p16/Ki67 Dual Stain for Management of Individuals Testing Positive for Human Papillomavirus (Enduring Consensus Committee, 2024)](https://journals.lww.com/jlgtd/fulltext/2024/04000/recommendations_for_use_of_p16_ki67_dual_stain_for.2.aspx)\n20. [Nicolas Wentzensen and colleagues (2025). Self-Collected Vaginal Specimens for HPV Testing: Recommendations From the Enduring Consensus Cervical Cancer Screening and Management Guidelines Committee. Journal of Lower Genital Tract Disease.](https://doi.org/10.1097/lgt.0000000000000885)\n21. [Screening for Cervical Cancer: U.S. Preventive Services Task Force Recommendation Statement (2012, Annals of Internal Medicine)](https://www.acpjournals.org/doi/10.7326/0003-4819-156-12-201206190-00424)\n22. [ASCCP Management Guidelines (2012 Consensus, published August 2014)](https://asccp.org/wp-content/uploads/2025/09/ASCCP-Management-Guidelines_August-2014.pdf)\n23. [HPV, Cytology, and Cotest Cervical Cancer Screening and the Risk of Precancer (JAMA Network Open, FOCAL-DECADE cohort)](https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2846208)\n24. [Evidence Summary: Cervical Cancer: Screening (USPSTF)](https://www.uspreventiveservicestaskforce.org/uspstf/document/evidence-summary/cervical-cancer-screening)\n25. [Primary HPV testing with cytology versus cytology alone in cervical screening, randomized controlled trial with two rounds in a Chinese population (Chan et al., 2020, Int J Cancer)](https://onlinelibrary.wiley.com/doi/10.1002/ijc.32861)\n26. [Primary human papillomavirus testing vs cotesting (JNCI, 2024)](https://www.ovid.com/journals/jnci/fulltext/10.1093/jnci/djae117~primary-human-papillomavirus-testing-vs-cotesting-clinical)\n\n---\n*Topic: Encyclopedia › Life and health › Human health and medicine › Public health and healthcare › Epidemiology as a discipline*\n\n*Initially written Sep 29, 2026 · Edited: Oct 15, 2026; Oct 21, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n", "same_as": [], "url": "https://www.edgepedia.org/cotesting", "markdown_url": "https://www.edgepedia.org/cotesting.md", "license": { "name": "Edgepedia Community License 1.0", "url": "https://www.edgepedia.org/edgepedia/license", "summary": "Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.", "spdx": "LicenseRef-Edgepedia-Community-1.0" }, "credit": "\"Cotesting\", Edgepedia (EdgeChat), https://www.edgepedia.org/cotesting. Edgepedia Community License 1.0.", "credit_md": "\"[Cotesting](https://www.edgepedia.org/cotesting)\", Edgepedia (EdgeChat), [https://www.edgepedia.org/cotesting](https://www.edgepedia.org/cotesting). [Edgepedia Community License 1.0](https://www.edgepedia.org/edgepedia/license).", "credit_html": "\"Cotesting\", Edgepedia (EdgeChat), https://www.edgepedia.org/cotesting. Edgepedia Community License 1.0.", "speakable": "Cotesting is a cervical cancer screening strategy combining HPV testing and the Pap test on the same specimen, recommended every 5 years for women aged 30 to 65." }