A barium compound used during a barium enema to block the passage of x rays during the exam

Barium sulfate comes as a powder to be mixed with water, a suspension (liquid), a paste, and a tablet. The enema will be administered by medical staff at the testing center through a atube that is to be inserted through a tube in the rectum. Barium sulfate is usually taken one or more times before an x-ray examination or CT scan.

The white solid precipitated when an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulfate is named "barium sulfate" and has the formula BsSO4.

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