Nutrition basics
Learning Center
Combination birth control pills
This oral contraceptive contains both estrogen and progestin to keep you from ovulating. These medicines prevent pregnancy and can have other benefits.
Colposcopy
Find out why colposcopy is done and what to expect during an exam to diagnose cancer and other problems affecting the cervix, vagina and vulva.
Cochlear implants
This electronic device improves hearing in people who have severe hearing loss from inner ear damage.
Chorionic villus sampling
Find out about this prenatal test that can uncover chromosomal and other genetic conditions early in pregnancy.
Cholesterol test
Measuring the amount of cholesterol and triglycerides in your blood can help predict your risk of blocked arteries in your heart and brain.
Chest X-rays
Learn what these chest images can show your doctor and what conditions they may uncover.
Cervical mucus method for natural family planning
Normal vaginal discharge can give you clues about your fertility. Learn how to track changes in cervical mucus to predict when you may be more likely to get pregnant.
Cataract surgery
Cataract surgery — Overview covers risks, complications, results of this eye surgery.
Carotid ultrasound
This test examines the blood flow through the arteries in the neck that deliver blood from the heart to the brain.
Carotid endarterectomy
This procedure removes plaque buildup in the carotid artery to help reduce your risk of stroke.
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