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Lactate dehydrogenase ec isozymes in vaginal swab extracts a problem for the identification of menstrual blood

, : Lactate dehydrogenase ec isozymes in vaginal swab extracts a problem for the identification of menstrual blood. Forensic Science International 21(2): 139-148

Extracts of vaginal swabs free of both blood and semen, collected from 3 donors throughout several menstrual cycles, was examined by cellulose acetate membrane electrophoresis for the presence of lactate dehydrogenase (LDH) isozymes. LDH activity, predominantly in the form of LDH-5 was detected in some extracts. Mixtures of these particular extracts with peripheral blood gave LDH patterns similar to those observed for menstrual blood. LDH isozyme patterns cannot be used to differentiate between stains of menstrual blood and bloodstains that have become mixed or contaminated with vaginal secretions.


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