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Term Definition

A coenzyme that assists in processing the first step of the urea cycle and activates carbamoyl phosphate synthetase 1.

Nasogastric (NG) tube

A flexible tube that is passed through the nose and down through the nasopharynx and esophagus into the stomach. It can be used to remove the contents of the stomach, including air, small objects and fluid. It can also be used to place contents into the stomach, such as nutrients.

Neonatal-onset disorder

Severe, catastrophic disorder with life-threatening symptoms occurring in the neonatal period resulting from null/zero enzyme mutations or severely impaired enzyme activity.


An abnormal decrease in the number of neutrophils in the blood.

NICU (Neonatal Intensive Care Unit)

A specialized department in a hospital that provides intensive-care medicine to newborns.

Night terrors

Night terrors are episodes of fear, flailing and screaming while asleep. Night terrors often are paired with sleepwalking.


An atmospheric gas that forms many compounds in the body (such as proteins) and is a component of all living cells.

Non-verbal learning disability

A disorder characterized by high verbal skills but experiences challenges with processing non-verbal information.

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