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Learning Center
Blood urea nitrogen (BUN) test
Learn about the blood urea nitrogen (BUN) test to assess kidney function and what possible results could mean.
Blood transfusion
A blood transfusion can help replace blood lost due to surgery or injury. It also can help if an illness prevents your body from making blood correctly.
Blood pressure test
Learn how this simple test is done, how often you need one and what the results mean.
Blood donation
Find out what to expect during blood donation and how your blood will be used to help others.
Blood and bone marrow stem cell donation
Learn what these donations involve and what the risks are.
Blepharoplasty
Learn what's involved and the risks, as well as what kind of results you can expect from this eyelid surgery.
Bladder removal surgery (cystectomy)
Learn about new ways to surgically remove the bladder and rebuild another urinary system.
Birth control patch
Learn how to use this type of birth control that delivers estrogen and progestin through a patch you wear on your skin to prevent pregnancy.
Biofeedback
This technique teaches you to control your body's functions, such as your heart rate and breathing patterns. It can be helpful for a variety of health problems.
Bilirubin test
Find out what to expect from a bilirubin test — an important blood test that determines how your liver is functioning.
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