Provided are processes for the use of a single dried blood sample for the preparation of test samples including targets of differing structures. The processes allow the same dried blood sample to be used for preparation of a first test sample including a non-nucleic acid target, and the same dried blood sample to be subsequently processed for preparation of a test sample that includes a nucleic acid target whereby the processes preserve the ability of the nucleic acid to be detected in subsequent detection assays following prior isolation of non-nucleic acid targets.