ABC-BIO Practice Questions - ABC Biological Evidence Screening Certification (ABC-BIO) Exam

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A bench analyst dabs a stain with filter paper, adds phenolphthalin reagent, then hydrogen peroxide, and the paper turns bright pink within seconds. What does this result indicate?

Confirmed presence of human blood Presumptive positive for blood (peroxidase activity) Confirmed presence of menstrual blood Eliminates blood from further consideration

Correct Answer:

Presumptive positive for blood (peroxidase activity)

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