Karyotype Test

Chromosome Analysis

Results

Karyotype is a test to identify and evaluate the size, shape, and number of chromosomes in a sample of body cells.

Results of a karyotype test are usually available within 1 to 2 weeks.

Karyotype

Normal:	There are 46 chromosomes that can be grouped as 22 matching pairs and 1 pair of sex chromosomes (XX for a female and XY for a male). The size, shape, and structure are normal for each chromosome.
Abnormal:	There are more than or less than 46 chromosomes. The shape or size of one or more chromosomes is abnormal. A chromosome pair may be broken or incorrectly separated.

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Author:	Maria G. Essig, MS, ELS	Last Updated: April 26, 2007
Medical Review:	Joy Melnikow, MD, MPH - Family Medicine Renee H. Martin, PhD - Medical Genetics
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