| Subject | Contents |
| Definition | A test where cells are taken from the tongue and evaluated for the presence of Barr bodies (a mass seen in a normal female sex chromosome). |
| Alternative Names | Sex chromatin test |
| How the test is performed | Cells are collected by scraping the tongue with a spatula. The cells are then placed on a slide and the sample is taken to the laboratory for evaluation. |
| How to prepare for the test | No preparation is necessary for this test. |
| How the test will feel | You will feel a scraping sensation as cells are removed from the tongue. |
| Why the test is performed | In the past, this test was used to indicate: abnormal sexual development ambiguous genitalia amenorrhea suspected chromosomal abnormalities Today, a health care provider who suspects any of these abnormalities is most likely to perform a full chromosome analysis (called karyotyping ). The buccal smear is primarily used in the Olympics or other sporting event if the authorities believe a man is trying to compete as a woman. |
| Normal Values | The normal value depends on the reason for the screen. If a male if suspected of imitating a woman, then a normal result would indicate the presence of Barr bodies, or that the person really is a female. |
| What abnormal results mean | If no Barr bodies appear the test subject is a male. |
| What the risks are | There are no risks associated with the buccal smear. |
| Special considerations | |
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