Discussion
Confirmation of menstrual blood stain is done by the following method :
Answer: B
Menstrual blood is confirmed by detecting fibrin degradation products (FDP). Menstrual blood has already clotted and been dissolved by fibrinolysis in the uterus, so it contains FDP, and does not clot, unlike blood from a wound.
Isoenzyme markers and protein markers are used to type blood or to tell species and are not specific to menstrual blood in routine practice. Restriction enzymes are used in DNA profiling to cut DNA, which identifies a person and not the source of the stain. Blood from a wound clots because fibrin forms, and in menstrual discharge the fibrin is broken down in the uterus, so the stain has a distinctive chemistry, which is also why the discharge stays fluid.
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