Final answer:
Ms. Ferrario, diagnosed with cervical dysplasia, should undergo a Pap smear annually to check for abnormal cervical cells.
Step-by-step explanation:
The annual test Ms. Ferrario should undergo to check for abnormal cervical cells, given her diagnosis of cervical dysplasia, is a Pap smear.
This test involves a healthcare provider taking a small sample of cells from the uterine cervix and sending them to a medical laboratory.
There, a cytotechnologist stains the cells and examines them under a microscope to detect any changes that could indicate abnormal cell growth, cervical cancer, or a microbial infection.