Final answer:
The next step would be to start him on an angiotensin-converting enzyme (ACE) inhibitor to reduce protein levels in the urine and slow down kidney damage. Strict blood sugar control and good blood pressure control are also important in preventing further kidney damage.
Step-by-step explanation:
The next step in the management of Morris, who has had type 1 diabetes for 10 years and has shown microalbuminuria in recent urinalysis reports, would be to start him on an angiotensin-converting enzyme (ACE) inhibitor. Microalbuminuria in patients with diabetes is an early sign of kidney damage, known as diabetic nephropathy. ACE inhibitors help to reduce protein levels in the urine and slow down kidney damage. It is important to also stress the importance of strict blood sugar control and to maintain good blood pressure control in order to prevent further kidney damage. Ordering a 24-hour urinalysis or sending him to a dietitian would not be the appropriate next steps in this scenario.