I have read that mature red blood cells (MRBs)do not have DNA. So I am curious why crime scene technicians collect blood. Is it to collect and amplify segments of white blood cells?

  • $\begingroup$ A simple Google search of "DNA in blood" immediately provides an answer to the OP. VTC. $\endgroup$
    – user22020
    Commented Jan 14, 2018 at 14:27
  • $\begingroup$ Blood was collected and analyzed long before DNA techniques. E.g. blood typing could rule out suspects with a different blood typing, or the blood on a suspect's clothing could be from an animal... $\endgroup$
    – jamesqf
    Commented Jan 14, 2018 at 20:44
  • $\begingroup$ I appreciate the comments. Just to be clear, I wasn't being lazy when I made the question. Of course I could use a search engine. I've been exposed to this StackExchange for maybe two weeks, and I find the questions and the depth of knowledge that contributors bring with their answers to be amazing. I plan to make a Toastmaster's speech on aspects of DNA later this month. No one in the speech club knows anything about cell biology. I'm sure they will be surprise to learn that MRBC's do not have DNA. The input given to me was just what I hoped for! $\endgroup$
    – Mike
    Commented Jan 15, 2018 at 0:28
  • $\begingroup$ three words; white blood cells. $\endgroup$
    – John
    Commented Jan 19, 2018 at 6:54

1 Answer 1


There's still white blood cells with DNA.

Some forensic blood tests are:

Conventional serological analysis:

  • Analysis of the proteins, enzymes, and antigens present in the blood, for general doctor tests: (black/white/drunk/stoned/heroin addict/polio vaccinated/hiv pos...)

Restriction Fragment Length Polymorphism (RFLP) DNA :

  • Direct analysis of certain DNA sequences present in the white blood cells. This method also usually requires a "large" sample size to obtain significant results.

Polymerase Chain Reaction (PCR) DNA :

  • Analysis of certain DNA sequences that have been copied multiple times to a detectable level.

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