Some causes of elevated bile acids include intrahepatic cholestasis of pregnancy (ICP) and structural liver disease

References:

Abbassi-Ghanavati M, Greer LG, Cunningham FG. Pregnancy and laboratory studies: a reference table for clinicians. Obstet Gynecol. 2009 Dec;114(6):1326-31. PMID:19935037
Egan N, et. al., Reference standard for serum bile acids in pregnancy.
BJOG. 2012 Mar;119(4):493-8.PMID:22251417
Lee RH, et. al., Bile acid concentration reference ranges in a pregnant Latina population.
Am J Perinatol. 2013 May;30(5):389-93.PMID: 23161351
Wallach, J. Interpretation of Diagnostic Tests, Eighth ed. Lippincott Williams & Wilkins, 2007 Fischbach FT, Dunning MB III, eds. A Manual of Laboratory and Diagnostic Tests, 7th ed. Philadelphia, Lippincott Williams and Wilkins,2004