Teen health
Learning Center
Complete blood count (CBC)
Learn what to expect from having this common blood test, why it's done and how to prepare.
Cochlear implants
This electronic device improves hearing in people who have severe hearing loss from inner ear damage.
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.
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.
Cardiac resynchronization therapy
This heart failure treatment uses a pacemaker or a pacemaker with a defibrillator. Know when the treatment is needed.
CT coronary angiogram
Learn about the risks and results of this imaging test that looks at the arteries that supply blood to your heart.
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.
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