3. Forensic Biology

Body Fluid Id — Quiz

Test your understanding of body fluid id with 5 practice questions.

Practice Questions

Question 1

Which statement correctly distinguishes presumptive tests from confirmatory tests in body fluid identification?

Question 2

Given a presumptive blood test with sensitivity 0.98, specificity 0.90, and a prevalence of bloodstains at 5%, what is the approximate positive predictive value (PPV)?

Question 3

If a presumptive semen test has sensitivity 0.85, specificity 0.95, and semen stain prevalence of 20%, what is the approximate negative predictive value (NPV)?

Question 4

Which confirmatory microscopic test identifies blood by producing characteristic pyridine hemochromogen crystals?

Question 5

Which immunochromatographic strip test is used to confirm the presence of human blood by detecting glycophorin A?