| ENCYCLOPEDIA INDEX |
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| 1 2 5 A B C D E F G H I J K L M N O P Q R S T U V W X |
Fragile X syndrome chromosome analysis |
| Overview Risks Results |
| Normal Values: |
| In the laboratory, a number of cells are evaluated, and a percentage is established comparing the number of abnormal cells to the number of normal cells. A normal result would indicate that less than 4% of the cells has a constricted section on the long arm of the X chromosome. |
| What abnormal results mean: |
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If more than 4% of the cells evaluated test positive for fragile X chromosomes, fragile X syndrome is indicated. Again, this test is virtually obsolete in practice since molecular analysis has identified the presence of "pre-mutations." It is usual to repeat a fragile X study performed earlier by chromosomal analysis with the molecular analysis that is now the standard of care. |
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