An element used in contrast media for magnetic resonance imaging.


A frame housing the x-ray tube, collimators, and detectors in a CT machine, with a large opening into which the patient is inserted.

Gastrointestinal (GI)

Relating to the stomach and intestines.


Nonproprietary, or not protected by trademark registration.


The beginning of a process.

Genetic Engineering

A variety of techniques that molecular biologists use to manipulate DNA molecules to study the expression of a gene.


Glomerular filtration rate.


Growth Hormone, secreted by the pituitary gland; the major hormone responsible for height growth


Growth hormone releasing hormone.


Growth hormone release inhibiting hormone (same as SRIF)


Growth hormone releasing peptide.


An organ of the body that produces materials (hormones) released into the bloodstream, such as the pituitary or pineal gland. Hormones influence metabolism and other body functions.

Glucagon Test

Glucagon is a hormone that is produced by cells in the pancreas the function of which is to raise blood sugar.


Medications used to decrease swelling around tumors. Medication to duplicate the effects of cortisol.


A type of sugar found in the blood; an important source of energy in the body.

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