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Oxygen saturation refers to the amount of oxygen being carried in the red blood cells, which load up with oxygen in the lungs and

Oophoritis is inflammation of an ovary (or ovaries), which occurs most often as a complication of an infection of the reproductive

An outbreak of an illness occurs when there is an increase in the number of people who live in the same area and are infected

Oxygen therapy means using an oxygen tank or a machine to breathe in air that contains more oxygen than normal. Oxygen therapy

A pacemaker is a small, battery-powered device that sends out small electrical impulses to make the heart muscle contract

Oligoarticular juvenile idiopathic arthritis (JIA), also known as oligoarthritis, is the most common and often the mildest type of

A pacifier is a plastic or rubber device for a baby to chew or suck on. Babies often need to suck for satisfaction rather than for

Parkinson's disease is a problem with certain nerve cells in the brain that control movement. The main symptoms are shaking

Parathyroid hormone is a substance that helps maintain the proper amount of calcium in the blood. Parathyroid hormone is produced

The parathyroid glands are several (usually four) tiny glands, located next to or behind the thyroid gland in the neck. They help