Discussion
Fibrinogen and LDH are used for the identification of :
Answer: B
Fibrinogen and LDH are used to identify menstrual blood.
Menstrual blood has two distinctive features. It has very little fibrinogen and does not clot, because it has already undergone fibrinolysis in the uterus. It also has a characteristic lactate dehydrogenase (LDH) isoenzyme pattern, with a raised LDH-4 and LDH-5 fraction compared with circulating blood. Together these distinguish menstrual blood from blood from a wound, which can matter in sexual offence cases.
Saliva is identified by amylase, and semen by acid phosphatase, sperm and p30 (PSA), so neither depends on fibrinogen and LDH.
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