Intrahepatic cholestasis of pregnancy is common among patients' first-degree relatives.

Intrahepatic cholestasis of pregnancy has been shown to have a genetic predisposition. We studied whether Finnish women who had suffered from the disorder reported their first-degree relatives to have had liver dysfunction during their pregnancies. Questionnaires were sent in autumn 2010 to a total of 544 former intrahepatic cholestasis of pregnancy patients and 1235 controls, all having delivered during 1969-1988. The response rate was 66.2%. The incidence of intrahepatic cholestasis is 0.5-1.5% of pregnancies in Finland. In our survey, altogether 12.8% of mothers (odds ratio 9.2), 15.9% of sisters (odds ratio 5.3) and 10.3% of daughters (odds ratio 4.8) of women who had suffered from intrahepatic cholestasis of pregnancy had had liver dysfunction during pregnancy. Our findings strengthen the earlier knowledge of the genetic component in intrahepatic cholestasis of pregnancy. We suggest that all pregnant women are asked about their family history regarding liver dysfunction during pregnancy.