<prompt> Laboratory, test for lead poisoning?Lead in urineALA in urineCoproporphyrin in urineAll of the above  <response>: Ans. is d i.e., All of the above Lead Poisoning ? Most common mode of absorption of lead is inhalation of fumes and dust of lead or its comppunds. Other less common mode of absorption are ingestion and absorption through skin especially tetraethyl lead. A blood level 70 g100 ml or more is generally associated with clinical symptoms. Lead exes its toxic action by combining with essential SH - groups of ceain enzymes. Lab tests for lead poisoning Coproporphyrin in urine CPU -4 In non exposed persons, it is less than 150 gL. Amino levulinic acid ALA in urine If it exceeds 5 mglitre it indicates clearly lead absorption. Lead in blood and urine : Lead in blood and urine are quantitative indicators of exposure. Lead in urine of over 0.8 mglitre indicates lead exposure. Blood level of 70 micro g100m1 is associated with clinical symptoms Basophilic stipling of RBC Is a sensitive parameter of the hematological response. 