<prompt> A useful screening test for lead is measurement of which of the following?Coproporphyrin in urineAmino laevelunic acid in urineBasophil in urineLead in morning urine sample  <response>: Coproporphyrin in urine: Useful screening test. 150ugL in non exposed persons. Amino laevulinic acid in urine: indicates lead absorption if 5mgL Lead level in urine: if 0.8 mgL indicates lead exposure and absorption Basophillic stippling of RBC : sensitive parameter of hematological response Ref: Parks textbook of Preventive and Social Medicine, 21st Edition, Page-749 