Can We Find DNA in Blood Without Red Blood Cell Nuclei?

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Red blood cells lack nuclei, which raises the question of DNA presence in blood. However, blood contains numerous white blood cells that do have nuclei and therefore contain DNA. The absence of a nucleus in red blood cells is a physiological adaptation that allows them to achieve a spheroid shape, optimizing surface area for efficient gas exchange.
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If red blood cells don't have nuclei, then does this mean we can't find DNA in blood?

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There are many white blood cells in blood that do contain DNA.

Red blood cells loose their nucleus, because they have to attain a specific spheroid form (to optimize the surface area for gas-exchange), which is impossible with a bulky nucleus.
 

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