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 (Ba) [bar´e-um]
a chemical element, atomic number 56, atomic weight 137.34. (See Appendix 6.) Ingestion of excessive amounts can be toxic, occasionally resulting in fatal hypokalemia and paralysis.
barium sulfate a water-insoluble salt used as an opaque contrast medium for x-ray examination of the digestive tract.
barium test x-ray examination using a barium mixture to help locate disorders in the esophagus, stomach, duodenum, and small and large intestines. Such conditions as peptic ulcer, benign or malignant tumors, colitis, or enlargement of organs that might be causing pressure on the stomach may be readily identified with the use of barium tests. If perforation exists or is suspected, the barium test should not be administered. It is important to evacuate the barium completely following the study; a mild laxative is usually prescribed for this purpose.

Barium sulfate is a harmless chalky, water-insoluble compound that does not permit x-rays to pass through it. Taken before or during an examination, it causes the intestinal tract to stand out in silhouette when viewed through a fluoroscope or seen on an x-ray film.

Two main types of tests are conducted with the use of barium: the barium meal or barium swallow, for radiologic examination of the upper gastrointestinal tract, and the barium enema for examination of the lower gastrointestinal tract.
Barium test: Barium meal and follow-through. Normal stomach and small bowel. From Aspinall and Taylor-Robinson, 2001.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

bar·i·um (Ba),

(ba'rē-ŭm, bā'rē-ŭm),
A metallic, alkaline, divalent earth element; atomic no. 56, atomic wt. 137.327. Its insoluble salts are often used in radiology as contrast media.
[G. barys, heavy]
Farlex Partner Medical Dictionary © Farlex 2012


(bâr′ē-əm, băr′-)
1. Symbol Ba A soft, silvery-white or yellowish-white alkaline-earth metal, used to deoxidize copper and to absorb trace gases in vacuum tubes, and used in various alloys. Atomic number 56; atomic weight 137.33; melting point 727°C; boiling point 1,897°C; specific gravity 3.62; valence 2. See Periodic Table.
2. A radiopaque solution containing barium sulfate that is used to visualize the gastrointestinal tract on x-rays.

bar′ic (-ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


A silver-white alkaline earth-metallic element—atomic number 56, atomic weight 137.3—which melts at 727ºC. Pure barium does not exist in nature as it is oxidised, often as baryta.

Barium is the core constituent in non-radioactive radiocontrast studies (e.g., barium enema, barium swallow), and formulated as a chalky liquid, popularly, a milkshake.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


(Ba) (bar'ē-ŭm)
A metallic, alkaline, divalent earth element; atomic no. 56, atomic wt. 137.327. Salts are often used in diagnostic x-rays.
[G. barys, heavy]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A chemical used in certain radiological studies to enhance visualization of anatomical structures.
Mentioned in: Intussusception
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.


A metallic, alkaline, divalent earth element. Its insoluble salts are often used in radiology.
[G. barys, heavy]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
This report researches the worldwide Barium Nitrate market size (value, capacity, production and consumption) in key regions like United States, Europe, Asia Pacific (China, Japan) and other regions.
The report offers comprehensive analysis with respect to investments and regulatory scenario that would subsequently impact the outlook and forecast for the global barium carbonate market between 2018 and 2026
PULMOBRANCHIATE has BARIUM, BOHRIUM, BROMINE, CARBON, CERIUM, COBALT, ERBIUM, HELIUM, IRON, NOBELIUM, PLATINUM, RHENIUM, TERBIUM, THORIUM and TIN Once again, simple pluralisation by the addition of an S generates an additional three elements, for this 18-element 16-letter solution:
Barium hydroxide and barium chloride are regularly used to remove soluble sulfate from industrial and municipal wastewater.
China is expected to be the next largest consumer of the barium Sulfate market.
However, we selected open appendectomy but not laparoscopic approach in the present case because we preoperatively could not diagnose barium appendicitis with peritonitis.
There was barium contamination of the entire peritoneal cavity.
In the coprecipitation method, the preparation of BaTi[O.sub.3] nanoparticles through the coprecipitation of barium and titanium hydroxides from aqueous solutions has been reported since the early Flaschen research work [27].
Barium, which when compounded with sulfur and oxygen is used in X-ray imaging of the digestive system, is used in fireworks to produce a green color.
That trial enrolled 742 subjects who underwent a VFSS using thin (<15 cP), nectar thick (300 cP), and honey thick (3,000 cP) bariums. Results indicated that significantly more patients aspirated thin liquid barium than nectar (68% vs 63%, respectively) or honey barium (68% vs 53%, respectively) [11].