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A 65-year-old woman with severe depression is evaluated after laboratory tests reveal abnormal liver-enzyme levels:

alanine aminotransferase 56 U/liter (reference range, 0–35) and aspartate aminotransferase 61 U/liter (0–35).

Additional laboratory testing yields the following results:
Hepatitis B surface antigen negative
Hepatitis B core antibody positive
Hepatitis B surface antibody negative
Hepatitis C antibody positive
Hepatitis C ribonucleic acid test (hepatitis C viral load) 1,560,000 IU/mL
HIV antibody negative

She is diagnosed with genotype 1, chronic HCV infection.

What additional work up is needed from here?