26th February 2024

A 55-year-old man visits the hepatitis outpatient clinic for his regular follow-up.

A 55-year-old man visits the hepatitis outpatient clinic for his regular follow-up. He was diagnosed with hepatitis-C 3 years ago and since then has been taking ribavirin tablets. He is a known intravenous drug user. His past medical history includes HIV and syphilis.

Select one option which correctly describes an element of the monitoring required for patients taking ribavirin.