Rotor Syndrome, an autosomal recessive disease associated with elevated conjugated bilirubin, is an example of a disease frequently associated with mutations in SLCO1B1 and SLCO1B3. The most frequent polymorphisms found in this gene are SLCO1B1*1B (388A > G), SLCO1B1*4 (463C > A), and SLCO1B1*5 (521 T > C), and the most commonly associated with hyperbilirubinemia is the SLCO1B1*1B (388A > G) [9, 11–13]. The gene discussed is SLCO1B1; the disease is Rotor syndrome.