Forensic Medicine In case of chronic lead poisoning, the levels of which of the following is elevated: NIMHANS 11 A Porphobilinogen B 6-amino levulinic acid C Bilirubin D Urobilinogen 💡 Explanation In case of chronic lead poisoning, the levels of which of the following is elevated: NIMHANS 11 ✓ Correct Answer: B. 6-amino levulinic acid