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A nasogastric (NG) tube is a long flexible tube inserted into a person's nose and threaded into the stomach to deliver fluid that

A nasal cannula is a flexible plastic tube that has a set of two prongs that can be placed in the nostrils. The tube is connected

Some medical tests report results in nanomoles (nmol) per liter (L). A mole is an amount of a substance that contains a large

Nephrotic syndrome is a warning sign that something is damaging your kidneys. It causes high levels of protein in the urine and

When people use tobacco products on a regular basis, their bodies develop a need for nicotine. If they don't get nicotine, they

Oral cancer is the growth of abnormal cells in any part of the mouth or lips. Most oral cancers start in the lining of the lips or

Oximetry is a medical test that uses a device called an oximeter to measure the amount of oxygen in the blood (oxygen saturation)

The ovaries are two small glands, located on either side of the uterus, that are part of the female reproductive system. The

A functional ovarian cyst is a fluid-filled sac on your ovary. Most of these cysts are harmless and will go away on their own. But

Otitis externa is an inflammation or infection of the ear canal (the passage leading from the external ear to the eardrum) that