Guided case: confirm the lead screen

A 3-year-old child in housing built before 1978 has a capillary blood lead screen collected in a lead-free capillary device at 14.0 µg/dL. A capillary result at or above 3.5 µg/dL needs venous confirmation, and the 10 to 19 µg/dL band has a recommended confirmation window within 1 month. Delayed confirmation can delay exposure investigation and follow-up while exposure continues; the one-month window is a recommendation, not a hard universal deadline.

The laboratory requests whole blood in its specified trace-element-free EDTA tube, not a routine lavender-top tube assumed acceptable by color. ICP-MS reports the venous specimen at 12.8 µg/dL. Using 1 µg/dL approximately equal to 0.04826 µmol/L, the converted value is 0.62 µmol/L after rounding.

The confirmed venous result is above the CDC blood lead reference value of 3.5 µg/dL. That population-based reference value is not a toxicity threshold, safety limit, or diagnostic cutoff. The result supports exposure-source investigation and follow-up under applicable guidance, not a laboratory diagnosis of lead toxicity.

Local laboratory policy places 12.8 µg/dL below its own panic list and releases it through the routine workflow while state reporting proceeds under applicable law. A laboratory-defined alert value requires immediate notification under CLIA, but CLIA does not set a universal lead value or minute-based deadline. Confirm an elevated capillary screen with correctly collected venous whole blood before releasing the interpretation.