Forensic Medicine In nonexposed persons, the level of coproporphyrin in urine is : A Less than 150 microgram/litre B Less than 1000 microgram/litre C More than 500 microgram/litre D None of the above 💡 Explanation In nonexposed persons, the level of coproporphyrin in urine is : ✓ Correct Answer: A. Less than 150 microgram/litre