What is the specimen of choice for determining arsenic exposure in an individual and why?

Question

Quizplus · Accepted Answer

Urine is the specimen of choice because arsenic is excreted predominantly by the kidneys and urine can provide a measure of recent exposure. Urine levels can indicate exposure within the past 1-3 days, while blood levels can only indicate exposure over a shorter period of time (i.e. up to 48 hours). Serum and plasma are not considered ideal specimens for arsenic exposure assessment.

What Is the Specimen of Choice for Determining Arsenic Exposure