up to 30 % of children with lead concentrations of greater than or equal to 40 g/100 ml ( greater than or equal to 1.93 mumol/l ) and nearly 60 % of children with greater than or equal to 30 microgram/100 ml ( greater than or equal to 1.45 mumol/l ) would remain undetected if protoporphyrin analysis were used for screening with an action level of 60 microgram/100 ml ( 1.07 mumol/l ) for the porphyrin analysis .
C0033733
protoporphyrin
C0032712
porphyrin