Laboratory Criteria for Diagnosis
Blood lead concentration, as determined by a Clinical Laboratory Improvement Amendments (CLIA)-certified facility, of ≥5 µg/dL (0.24 µmol/L) in a child (person <16 years of age).
Criteria to Distinguish a New Case from an Existing Case
Counted once per year, regardless of number of elevated blood lead levels in the same year.
One venous blood specimen with elevated lead concentration, or two capillary blood specimens, drawn within 12 weeks of each other, both with elevated lead concentration.
A single capillary or unknown blood specimen with elevated lead concentration or two capillary blood specimens, drawn greater than 12 weeks apart, both with elevated lead concentration.
Case Classification Comments
Elevated blood lead levels, as defined above, should be used as standard criteria for case classification for the purposes of surveillance but may not correspond to action levels determined by individual public health programs or by providers with respect to patient care.
Elevated BLL classification does not use any case classification categories other than “confirmed” and “unconfirmed”. The “unconfirmed” category identifies tested children with a potentially elevated BLL but where testing was inadequate to make that determination.