The following information may help to address your question:
An amniocentesis is a test during pregnancy that removes a small amount of fluid from the sac around the baby (called the amniotic sac) to look for birth defects and chromosome problems. This test usually looks for chromosome problems in the baby including Down syndrome, Trisomy 13, and Trisomy 18. This test also looks for neural tube defects in the fetus such as spina bifida.
An amniocentesis can only be used to diagnose other genetic conditions during pregnancy if a fetus is suspected to have a particular genetic condition, usually based on abnormal ultrasound or family history. Because McCune-Albright syndrome occurs in people without a family history of the condition, an amniocentesis will not detect it. We recommend that you speak with a genetics professional for additional information about testing for this condition.GeneTests lists the names of laboratories that are performing genetic testing for McCune-Albright syndrome. To view the contact information for the clinical laboratories, conducting testing click here. Please note: Most of the laboratories listed through GeneTests do not accept direct contact from patients and their families; therefore, if you are interested in learning more, you will need to work with a health care provider or a genetics professional.