Lead concentration in blood is considered alarming if it is
a) 20 μg/100 mL b) 30 μg/100 mL c) 4-6 μg/100 mL d) 10 μg/100 mL
AA
BB
CC
DD
A.
(b) The concentration of lead in blood averages about 25 μg/100 mL. Increase to 70 μg/100 mL is generally associated with clinical symptoms. Hence, a level of 30 μg/100 mL is considered alarming.