In the randomised (double-blind, placebo-controlled) study 20 pregnant women with ICP received (random allocation of) either 450 mg/day UDCA or placebo for 14 days during the third trimester of pregnancy. The severity of pruritus was registered. Itching scores and serum levels of alanine aminotransferase, total bile acids, estradiol, progesterone, prolactin, cholesterol, HDL-cholesterol, triglycerides, activated partial thromboplastin time (APTT), fibrinogen D-dimers (FIDD) and platelet count were assessed before the treatment and weekly thereafter. Data on pregnancy and delivery outcome was recorded and analysed.