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Polysomnography (sleep study)
Your health care provider may order this test if a sleep disorder such as sleep apnea is suspected. Learn how to prepare and what to expect.
Video: Allergy tests
What happens in an allergy test? Watch this video and find out.
Video: Colonoscopy
See what a doctor sees when you undergo an examination of your colon.
Video: Sentinel node biopsy for melanoma
Video shows sentinel node biopsy to determine whether melanoma has spread.
Video: Skin cancer — How skin cancer develops
Watch this video to see what melanoma and nonmelanoma skin cancers look like and how they develop.
Video: Endoscopy
An endoscopy allows your doctor to view your esophagus, stomach and part of the small intestine. Here's how it works.
Croup
This upper airway infection makes it harder to breathe and causes a barking cough. It involves swelling around the voice box, windpipe and bronchial tubes.
Common cold in babies
This viral infection causes a runny nose and nasal congestion in babies. Find out how to ease symptoms and when to see a doctor.
Thalassemia
Some forms of this inherited blood disorder usually show up before the age of 2, often causing anemia. More severe forms of the disease require regular blood transfusions.
Video: Barium enema
See what to expect during an X-ray examination of your colon.
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