A normal ultrasound would make liver and gallbladder disease less likely. An isolated bilirubin in the face of normal tests can be indicative of Gilbert's syndrome. This is an inherited disorder that occurs in 10% of the population - it is a disease that affects the way bilirubin is processed.
Usually, no treatment is necessary - however before settling on this disorder, I would ensure with your physician that there is no evidence of any other liver/gallbladder disorder.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com