Stress basics
Learning Center
Concussion testing and screening tools
These screening tools help measure brain function after head trauma and help athletes at risk of head injuries.
Contraceptive implant
Learn about the benefits, risks and effectiveness of this type of long-acting, reversible birth control.
Convalescent plasma therapy
Convalescent plasma therapy uses blood from people who've recovered from an illness, such as COVID-19, to help others recover.
Copper IUD (ParaGard)
A copper intrauterine device offers a hormone-free option for long-acting, reversible birth control.
Cornea transplant
This procedure uses donor tissue to restore vision and reduce pain from cornea disease. Our overview helps you understand the risks and benefits of this sight-saving operation.
Coronary angiogram
Learn more about this heart disease test that uses X-ray imaging to see the heart's blood vessels.
Coronary angioplasty and stents
Coronary angioplasty and stents can open clogged blood vessels that deliver blood to heart muscles.
Coronary artery bypass surgery
This major heart surgery, also called CABG, creates a new route for blood to flow around a blocked artery. Learn why it's done and know the steps to take during recovery.
Coronary calcium scan
This heart CT test can show calcium deposits in the blood vessels. Know how the findings relate to your heart disease risk.
Cortisone shots
These shots can help relieve pain, swelling and irritation. Potential side effects generally limit the number of cortisone shots you can receive in one year.
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