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Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein. Karyotype is a test to identify and evaluate the size, shape, and number of chromosomes in a sample of body cells. Extra or missing chromosomes, or abnormal positions of chromosome pieces, can cause problems with a person's growth, development, and body functions. Karyotyping is done to: You do not need to do anything before you have this test. Since the information obtained from karyotyping can have a profound impact on your life, you may want to see a doctor who specializes in genetics (geneticist) or a genetic counselor. This type of counselor is trained to help you understand what karyotype test results mean for you, such as your risk for having a child with an inherited (genetic) condition like Down syndrome. A genetic counselor can help you make well-informed decisions. Ask to have genetic counseling before making a decision about a karyotype test. Karyotype testing can be done using almost any cell or tissue from the body. A karyotype test usually is done on a blood sample taken from a vein. For testing during pregnancy, it may also be done on a sample of amniotic fluid or the placenta. A health professional uses a needle to take a blood sample, usually from an arm. For this type of test, cells are collected from the fetus using amniocentesis or chorionic villus sampling. Bone marrow aspiration may be used for a karyotype test. Karyotype testing is usually done using a blood sample from a vein. You may feel nothing at all from the needle, or you may feel a quick sting or pinch. There is very little chance of having a problem from this test. A small bruise may form at the site. 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. Normal: Abnormal: Current as of: May 13, 2023 Author: Healthwise Staff Current as of: May 13, 2023 Author: Healthwise Staff Clinical Review Board This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use and Privacy Policy. Learn how we develop our content. To learn more about Healthwise, visit Healthwise.org. © 1995-2024 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.Karyotype Test
Test Overview
Why It Is Done
How To Prepare
How It Is Done
Blood sample from a vein
Cell sample from a fetus
Cell sample from bone marrow
How It Feels
Risks
Blood sample from a vein
Results
Related Information
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Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.