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Diseases & conditions A-Z List

Diseases & Conditions A-Z List - «V»:

  1. Virtual colonoscopy Virtual colonoscopy
    Virtual colonoscopy (VC) combines MRI or CT scans with sophisticated computer software to produce three-dimensional images of the colon and rectum. The test is less invasive than conventional colonoscopy. How the Test is Performed Patients must follow a strict bowel-emptying procedure the day before...
  2. Visceral larva migrans Visceral larva migrans
    Visceral larva migrans is infection with certain parasites found in the intestines of dogs and cats. Causes Visceral larva migrans is caused by worms (parasites) that infect the intestines of dogs and cats. The dog parasite is called Toxocara canis and the cat parasite is called Toxocara cati. Eggs...
  3. Visceromegaly Visceromegaly
    Visceromegaly is enlargement of the internal organs in the abdomen, such as liver, spleen, stomach, kidneys, or pancreas. Related topics: Hepatomegaly Splenomegaly ...
  4. Vision - night blindness Vision - night blindness
    Night blindness is poor vision at night or in dim light. Considerations Night blindness may cause problems with driving at night. People with night blindness often have trouble seeing stars on a clear night or walking through a dark room, such as a movie theater. These problems are often worse just...
  5. Vision problems Vision problems
    There are many types of eye problems and visual disturbances. These include blurred vision, halos, blind spots, floaters, and other symptoms. Blurred vision is the loss of sharpness of vision and the inability to see small details. Blind spots (scotomas) are dark "holes" in the visual field in which...
  6. Visual acuity test Visual acuity test
    The visual acuity test is used to determine the smallest letters a person can read on a standardized chart or card held 14 - 20 feet away. How the Test is Performed This test may be done in a health care provider's office, a school, a work place, or elsewhere. You will be asked to remove y...
  7. Visual field Visual field
    The visual field refers to the total area in which objects can be seen in the side (peripheral) vision while you focus your eyes on a central point. How the Test is Performed Confrontation visual field exam: This is a quick and basic check of the visual field. The health care provider sits directly...
  8. Vital signs Vital signs
    Vital signs include the heart beat, breathing rate, temperature, and blood pressure. These signs may be watched, measured, and monitored to check an individual's level of physical functioning. Normal vital signs change with age, sex, weight, exercise tolerance, and condition. Normal ranges for the a...
  9. Vitamin A Vitamin A
    Vitamin A is a fat-soluble vitamin. Function Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucous membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye. Vitamin A promotes good vision, especially in low light. It may...
  10. Vitamin A test Vitamin A test
    Vitamin A is a fat-soluble vitamin. This article describes the test used to measure the amount of vitamin A in the blood. See also: Beta-carotene test How the Test is Performed Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-k...
  11. Vitamin B12 Vitamin B12
    Vitamin B12 is a water-soluble vitamin. Water-soluble vitamins dissolve in water. After the body uses these vitamins, leftover amounts leave the body through the urine. Typically, water-soluble vitamins can not be stored by the body. Vitamin B12 is special, because the body can store it for years in...
  12. Vitamin B12 level Vitamin B12 level
    The vitamin B12 level is a test to tell how much vitamin B12 is in your blood. How the Test is Performed Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an...
  13. Vitamin B6 Vitamin B6
    Vitamin B6 is a water-soluble vitamin. Water-soluble vitamins dissolve in water. The body cannot store them. Leftover amounts of the vitamin leave the body through the urine. That means you need a continuous supply of such vitamins in your diet. Function Vitamin B6 helps the immune system produce ...
  14. Vitamin C Vitamin C
    Vitamin C is a water-soluble vitamin that is necessary for normal growth and development. Water-soluble vitamins dissolve in water. Leftover amounts of the vitamin leave the body through the urine. That means you need a continuous supply of such vitamins in your diet. Function Vitamin C is required...
  15. Vitamin C and colds Vitamin C and colds
    Despite the popular belief that vitamin C can cure the common cold, the scientific evidence for this is conflicting. Large doses of vitamin C may help reduce the duration of a cold, but they do not appear to protect against one in the first place, even after exposure to a cold virus. Vitamin C may o...