This issue Obstetrics and Gynecology Clinics examines medical disorders in pregnancy. Guest Editor Dr. Judith Hibbard has assembled a panel of experts who offer reviews on topics including Preeclampsia, Peripartum cardiomyopathy, Pregestational diabetes, Asthma management, Management of renal disease, Renal transplant recipients and pregnancy, Sickle disease and pregnancy, Thyroid disease, Gestational diabetes, Pregnancy after gastric bypass, Thromboprophylaxis in pregnancy, Cholestasis of pregnancy, and Ethical issues in obstetrics.