Chorionic villus sampling

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Results

By Mayo Clinic staff

Your health care provider or a genetic counselor will help you understand your chorionic villus sampling results.

Most test results are normal, which can ease anxiety about your baby's health. Occasionally, test results are unclear and amniocentesis is needed to clarify the diagnosis.

With chorionic villus sampling, there's a rare chance of a false-positive test — when the test is positive, but no disease exists. It's also important to remember that chorionic villus sampling can't identify all birth defects, including spina bifida and other neural tube defects.

If chorionic villus sampling indicates that your baby has a chromosomal problem or a genetic disorder that can't be treated, you may be faced with wrenching decisions — such as whether to continue the pregnancy. Seek support from your health care team and your loved ones during this difficult time.

References
  1. Ghidini A, et al. Chorionic villus sampling: Risks, complications and techniques. www.uptodate.com/home/index.html. Accessed Jan. 18, 2010.
  2. Diagnosing birth defects. American College of Obstetrics and Gynecology. http://www.acog.org/publications/patient_education/bp164.cfm. Accessed Jan. 18, 2010.
  3. Cunningham FG, et al. Williams Obstetrics. 23rd edition. New York, N.Y.: McGraw-Hill Companies; 2010. http://www.accessmedicine.com/content.aspx?aID=6021591. Accessed Feb. 8, 2010.
  4. Simpson JL, et al. Prenatal genetic diagnosis. In: Gabbe SG, et al. Obstetrics: Normal and Problem Pregnancies. 5th ed. Philadelphia, Pa.: Churchill Livingstone Elsevier; 2007:1.
  5. Chorionic villus sampling. March of Dimes. http://www.marchofdimes.com/professionals/14332_1165.asp. Accessed Feb. 9, 2010.
  6. Cystic fibrosis: Prenatal screening and diagnosis. American College of Obstetricians and Gynecologists. http://www.acog.org/publications/patient_education/bp171.cfm. Accessed Feb. 9, 2010.
  7. Tay-Sachs disease and Sandhoff diseases. March of Dimes. http://www.marchofdimes.com/pnhec/4439_1227.asp. Accessed Feb. 9, 2010.
  8. Harms RW (expert opinion). Mayo Clinic, Rochester, Minn. Accessed Feb. 10, 2010.
MY00154 May 15, 2010

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