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I have a simple question: If I give two samples of blood; one from a the menstrual period and one from spotting, is there a simple way to know which one is from the period and which one is from spotting " normal, non uterus " blood? Thanks

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    $\begingroup$ Spotting is "normal, non uterus"? Where does spotting come from if not the uterus? $\endgroup$ Commented Dec 4, 2016 at 13:41
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    $\begingroup$ agree with above comment - menstrual blood and blood from "spotting" are likely both uterine (except in the case of trauma, vaginal laceration, etc) $\endgroup$ Commented Dec 4, 2016 at 16:38
  • $\begingroup$ @VanceLAlbaugh - in which case(s), it would not be "normal". $\endgroup$ Commented Dec 4, 2016 at 18:40
  • $\begingroup$ @anongoodnurse exactly $\endgroup$ Commented Dec 4, 2016 at 18:42
  • $\begingroup$ The blood during the period is from the enlarged lining of the uterus caused by estrogen. spotting may be from the uterus but not related to period $\endgroup$
    – wael
    Commented Dec 5, 2016 at 4:29

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