Final answer:
Proteins, glucose, and nitrites are three substances checked for during a urinalysis. Their presence may indicate kidney damage, diabetes mellitus, or a urinary tract infection, respectively.
Step-by-step explanation:
Three substances checked for during a urinalysis are:
- Proteins: The presence of proteins in urine may indicate kidney damage or infection.
- Glucose: Elevated levels of glucose in urine may suggest diabetes mellitus.
- Nitrites: The presence of nitrites in urine may be a sign of a urinary tract infection caused by certain types of bacteria.