galactose tolerance test


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galactose

 [gah-lak´tōs]
a monosaccharide sugar of the aldose group, derived from lactose. d-galactose is found in lactose, in cerebrosides of the brain, in the sugar beet, and in many gums and seaweeds; l-galactose is found in flaxseed mucilage.
galactose tolerance test a laboratory test done to determine the liver's ability to convert the sugar galactose into glycogen. Two methods may be used. The oral method requires about 5 hours to complete, and the intravenous method, which is more accurate, requires about 2 hours. With the oral method, elimination of more than 3 g of galactose in the urine during a 5-hour period indicates liver damage. With the intravenous method, all galactose should have been eliminated from the blood 45 minutes after its injection.

ga·lac·tose tol·er·ance test

a liver function test, based on the ability of the liver to convert galactose to glycogen, measured by the rate of excretion of galactose following ingestion or intravenous injection of a known amount; normally, less than 3 g appear in the urine within 5 hours after the ingestion of 40 g.

galactose tolerance test

a test of the ability of the liver to remove galactose from the blood and convert it to glycogen. The test, which is used to estimate impaired liver function, measures the rate of galactose excretion after ingestion or injection of a measured amount of galactose.

ga·lac·tose tol·er·ance test

(gă-laktōs tolĕr-ăns test)
Liver function test, based on the ability of the liver to convert galactose to glycogen, measured by the rate of excretion of galactose following ingestion or intravenous injection of a known amount.

galactose

a monosaccharide derived from lactose. d-galactose is found in lactose, cerebrosides of the brain, raffinose of the sugar beet, and in many gums and seaweeds; l-galactose is found in flaxseed mucilage.

galactose 1-phosphate uridylyl transferase
involved in the metabolism of galactose to glycogen. Congenital galactosemia of humans and macropods is associated with a deficiency of this enzyme.
galactose tolerance test
a laboratory test done to determine the liver's ability to convert the sugar galactose into glycogen. Not much used in animals.
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