Teen health
Learning Center
COVID-19 antibody testing
Learn how COVID-19 antibody testing is done to find out if you've had a past infection with SARS-CoV-2, the virus that causes coronavirus disease 2019.
COVID-19 diagnostic testing
Find out how COVID-19 diagnostic testing is done to learn if you're currently infected with SARS-CoV-2, the virus that causes coronavirus disease 2019.
Cardiac ablation
Heat or cold energy applied to the heart can correct rapid or erratic heartbeats. Know when you might need this treatment and the risks.
Cardiac rehabilitation
Learn more about this personalized program to improve heart health through exercise, education and support.
Cardiac resynchronization therapy
This heart failure treatment uses a pacemaker or a pacemaker with a defibrillator. Know when the treatment is needed.
Cardioversion
Learn what to expect during this treatment to reset the heart rhythm.
Carotid endarterectomy
This procedure removes plaque buildup in the carotid artery to help reduce your risk of stroke.
Carotid ultrasound
This test examines the blood flow through the arteries in the neck that deliver blood from the heart to the brain.
Cataract surgery
Cataract surgery — Overview covers risks, complications, results of this eye surgery.
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.
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