AAA screening 

Abdominal duplex ultrasonography shows an abdominal aortic aneurysm with a diameter of 4.5 cm in an asymptomatic male. 

Next step - 

Repeating abdominal duplex ultrasonography in 6–12 months

Note: 

Elective repair >5.5 cm

Or > 0.5 cm growth in 6 months