A urine screen will be looking for any amphetamine use, not Adderall specifically. Adderall will show up in urine for up to 4 days after taking a single Adderall dose – sometimes up to a week, with chronic or heavy use. Most initial cutoff levels for amphetamines begin at 1000 ng/mL and require a confirmation test of 500 ng/ml to confirm the presence of amphetamines in the system. Trusted Helpline.