Useful screening test for lead is measurement of:: (A) Coproporphyrin in Urine, (B) Amino-levulinic acid in urine, (C) Lead in blood, (D) Lead in Urine
Answer is A. Diagnosis of lead poisoning: Laboratory parameters Remark Coproporphyrin in Urine (CPU) > 150 mcg/L Exposure to lead Amino levulinic acid in Urine (ALAU) > 5 mg/l Indicates lead absorption Lead in blood >70 mcg/100 ml Clinical symptoms appear Lead in Urine >0.8 mg/l Lead exposure and absorption Basophilic stripling of RBC&;s Punctate basophilia Ref: Park 25th edition Pgno: 845