The earliest markers of renal injury in lead poisoning is the:-: (A) Elevated lead level in urine, (B) Elevated free protoporphyrin in urine, (C) Elevated b 2 microglobulin in urine, (D) Elevated coproporphyrin in urine
Answer is C. Elevated urinary levels of N-acetyl-3-D-glucosaminidase and b-2-microglobulin may serve as early markers of renal injury.