Patients with sickle cell disease many have a number of systemic complications, including liver problems. Some of these liver problems lead to liver fibrosis/cirrhosis, secondary to chronic blood transfusions. The purpose of this study is to investigate FibroScan readings in patients with sickle cell disease and iron overload secondary to blood transfusions, and to correlate the FibroScan results with Ferriscan. A comparison with the results of FibroScan to patients with Sickle cell without known liver disease, who have never been on chronic transfusions and with normal liver function profiles will also be made.The primary hypothesis is that the results of FibroScan will correlate with the results of Ferriscan and liver biopsy.