Definitions

Birth Cohort Screening Rate
Number of children born in a specified year who receive a screening test in a given time and geographic area divided by the total number of children in the birth cohort.
Birth Year Cohort
Number of children born in a given year in a specified jurisdiction.
Case
A child that has a confirmed elevated blood lead level of ten micrograms per deciliter or greater (≥ 10ug/dL).
Confirmatory Test
Elevated blood lead level test results are confirmed by a single sample of blood taken directly from a vein (also called a "venous sample") or by two finger stick type samples (also called "capillary samples") when the elevated test results occurred within 12 weeks (or 84 days) of each other.
Elevated Blood Lead
Blood lead concentration of 10 micrograms per deciliter or greater.
Follow-up Test
All blood lead tests for a child (in a specified age range) subsequent to a confirmed elevated blood lead level test in a given time and geographic area.
Incidence (new cases with elevated blood lead levels)
The number of children who have never been identified by the reporting jurisdiction as having a previously confirmed elevated blood lead level (in a specified age range) who now have a confirmed elevated blood lead level in the given time.
Incidence Rate (new case rate)
The number of children identified for the first time with a confirmed elevated blood lead level (in a specified age range and geographic area) divided by the number of children that had a screening test in that given year. Only children who did not previously have a confirmed elevated blood lead level are included.
Lead-Poisoned
A child is considered to be lead poisoned if a blood screening indicates a blood lead level of 20 ug/dL or higher.
Prevalence (number of children with elevated blood lead levels)
The number of children with a test during the specified time period (in a specified age range and geographic area) who have a confirmed elevated blood level.
Prevalence Rate
Number of children who have a confirmed elevated blood lead level (in a specified age range and geographic area) with a test in a given time period divided by the number of children tested in that year (includes children’s screening, confirming, and follow-up tests) for blood lead.
Result
A quantifiable value from a blood lead test reported in micrograms of lead per deciliter of blood (ug/dL).
Screening
All blood lead tests for a child (in a specified age range) who has not had a previously confirmed elevated blood lead level in a given geographic area and time. When sequential test results are elevated but non-confirmed, then each test is considered a screening test. (A child’s first elevated venous screening test is also considered a confirmatory test).
Test
A blood lead draw (venous, capillary, or unknown sample type) on a child that produces a blood lead result as determined by a certified laboratory or other approved device.
Test Date
The date of the blood lead draw. When the date of the blood lead draw is not available then the date of blood lead sample analysis is used or the date of blood lead result report date received from the laboratory, if the analysis date is also not available.