Which tests are used to assess lead exposure?

Which tests are used to assess lead exposure?

• A. Blood lead levels (PbB) and blood zinc protoporphyrin (ZPP)
• B. Urine arsenic and blood cadmium
• C. Hair mercury and serum lead
• D. Saliva lead and urine zinc

Answer: (A)

Lead exposure is assessed primarily through blood measurements because lead in the body is reflected in the bloodstream, giving a direct indicator of recent exposure. The most standard test is the blood lead level, which directly shows how much lead is circulating in the blood. Zinc protoporphyrin in red blood cells rises when lead interferes with heme synthesis, so testing ZPP provides an additional indirect signal of lead’s effect on the body, especially when blood lead values are not clearly elevated. Together, these two tests offer a practical approach to evaluating lead exposure. Other options focus on other metals or use sample types not routinely validated for lead, such as hair, saliva, or urine zinc, making them inappropriate for assessing lead exposure.

Lead exposure is assessed primarily through blood measurements because lead in the body is reflected in the bloodstream, giving a direct indicator of recent exposure. The most standard test is the blood lead level, which directly shows how much lead is circulating in the blood. Zinc protoporphyrin in red blood cells rises when lead interferes with heme synthesis, so testing ZPP provides an additional indirect signal of lead’s effect on the body, especially when blood lead values are not clearly elevated. Together, these two tests offer a practical approach to evaluating lead exposure. Other options focus on other metals or use sample types not routinely validated for lead, such as hair, saliva, or urine zinc, making them inappropriate for assessing lead exposure.