Lead

Lead, also known as Pb, is a biomarker for a toxic metal. Its measurement provides a standardized way to report the amount of lead represented by a test result.

Lead is tested using a whole-blood sample. Because the specimen is whole blood, arranging the test with the correct sample type matters: a different specimen would not represent the same measurement. The result is reported in μg/dL and is interpreted against the reference and optimal ranges shown with the test; lower values are considered preferable.

Fasting is not required for this test, so fasting preparation is not needed when arranging collection. When booking, confirm that the laboratory is ordering a whole-blood lead measurement and ask whether it has any local requirements for sample collection or scheduling. Iron Serum and Calcium Total may be shown as related markers, but they are separate measurements from the lead result.

Read a Lead result against the reference range printed for the report and the unit used by that laboratory. The reference range describes the interval used for comparison, while the tighter optimal range represents a narrower target within it. Because lower results are considered better for Lead, a result can fall within the reference range without being within the optimal range.

A single value is not a diagnosis and should be interpreted in context rather than on its own. Results outside the stated reference range should be discussed with a clinician, who can consider the result alongside the reason for testing and other relevant clinical information.