If pica is suspected, medical evaluation is important to assess for possible intestinal blockages, as well as potential poisoning from ingested substances. If symptoms are present, the doctor will begin an evaluation by performing a complete medical history and physical examination. The doctor may use certain tests -- such as X-rays and blood tests -- to look for poisons and other substances in the blood, and to check for blockages in the intestinal tract. The doctor also may test for possible infections caused by eating items contaminated with bacteria or other organisms. A review of the person's eating habits also may be conducted.
Before making a diagnosis of pica, the doctor will rule out other disorders -- such as mental retardation, developmental disabilities, or obsessive-compulsive disorder--as the cause of the odd eating behavior.
Information taken from:
http://www.webmd.com/mental-health/mental-health-pica
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