Recommendations		American Cancer Society	U.S. Preventive Services Task Force	American College of Obstetricians and Gynecologists
Screening initiation		Approximately 3 years after onset of vaginal intercourse, but no later than age 21	Within 3 years of onset of sexual activity or age 21, whichever comes first	Approximately 3 years after onset of sexual intercourse, but no later than age 21
Screening intervals
	Conventional Papanicolaou test	Annually, then every 2 to 3 years for women 30 years and older with three negative cytology test results*	At least every 3 years	Annually, then every 2 to 3 years for women 30 years and older with three negative cytology test results*
	Liquid-based cytology	Every 2 years, then every 2 to 3 years for women 30 years and older with three negative cytology test results*	Insufficient evidence	Annually, then every 2 to 3 years for women 30 years and older with three negative cytology test results*
	HPV testing used as an adjunct to cytology	Every 3 years if cytology and HPV test results are negative	Insufficient evidence	Every 3 years if cytology and HPV test results are negative