Once it is determined that the ABO blood type is compatible, the candidate will have additional tests which include a complete blood count, liver and kidney function tests, and blood tests for hepatitis B and C and HIV. If the laboratory results confirm that the candidate is suitable as a donor, a chest x-ray and electrocardiogram (ECG) are done to make sure that he or she can safely receive anesthesia. If the blood work, ECG, and x-ray are within normal limits, a volumetric CT scan calculates the volume of the liver to determine whether the portion being donated will fit the recipient. The psychiatrist then does a comprehensive psychological evaluation to make sure that the candidate understands the risks of the procedure, is donating from his or her own free will, and has adequate support to be cared for after surgery. An Echocardiography, a Lung Function Test, Thyroid function tests and an MRI of the Biliary tree complete the donor work up.