In-depth

Risk factors

Obesity

Symptoms

Nausea and vomiting

Unexplained weight loss

Tests and diagnosis

Amniocentesis

Chorionic villus sampling

Genetic testing

Genetic testing is used to detect altered genes that may cause illness or disease. Although genetic testing can offer important health information, it has limitations.

Ultrasound

Urinalysis

Jan. 22, 2015