Intrahepatic cholestasis of pregnancy (ICP) is suspected during pregnancy when symptoms of itching (pruritis) present after 25 weeks of gestation with absence of a rash or underlying maternal liver disease. The diagnosis is typically confirmed with the finding of elevated serum bile acids. In the presence of a family history of intrahepatic cholestasis of pregnancy (ICP) and/or known mutations in either the ABCB11 or ABCB4 genes, genetic testing is available. The Genetic Testing Registry (GTR), a resource from the National Center for Biotechnology, offers a listing of laboratories that perform genetic testing for intrahepatic cholestasis of pregnancy. For more information, click on the link. 
How to diagnose Intrahepatic cholestasis of pregnancy ?