Aerobic exercise
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Video: Colonoscopy
See what a doctor sees when you undergo an examination of your colon.
Video: Barium enema
See what to expect during an X-ray examination of your colon.
Video: Baby's soft spots (fontanels)
A baby's soft spots (fontanels) close when the skull bones fuse together. See how.
Video: Allergy tests
What happens in an allergy test? Watch this video and find out.
Vesicoureteral reflux
Learn about what happens if urine flows backward from the bladder. Usually found in children, this condition boosts the risk of urinary tract infections.
Ventricular fibrillation
Without fast treatment, this heart rhythm problem can cause death within minutes. Learn the symptoms of VFib and what actions to take to save a life.
Vascular rings
Learn more about this condition in which malformations of the aortic arch encircle the windpipe and esophagus and can press against them.
Vaginal agenesis
In this rare condition that occurs before birth, the vagina doesn't develop and the uterus may only develop partially or not at all. Learn about treatment.
Urine cytology
A urine cytology test uses a sample of your urine to look for abnormal cells, which could indicate a urinary tract cancer.
Urinalysis
This common lab test checks urine for signs of disease and for clues about overall health.
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