Medicine General 9ffa3585 If urine dipstick shows +3, what is the protein level in mg/dl in urine A 30 mg/dl B 50 mg/dl C 100 mg/dl D 300 mg/dl High-Yield Explanation Answer-D. 300 mg/dl1+ = 30mg/dl2+ = 100mg/dl3+ = 300mg/dl4+ = 1000mg/dl