Semen can be detected in three ways using confirmatory tests. To keep in mind that semen confirmatory tests are not the same as DNA tests using sperm. A DNA test will not set out to confirm whether the biological sample provided contains semen but rather it’s attempt to extract a DNA profile of the individual to whom the sample belongs using the semen sample provided. Many companies such as The Genetic Testing Laboratories are able to extract a DNA profile from a semen sample so as long as this has been collected correctly and has not been contaminated