The system amplifies a short autosomal and a long autosomal target. After amplification, the PowerQuant® Analysis Software calculates the ratio of DNA concentrations for the shorter and longer amplicons. The resulting degradation ratio helps you determine if a DNA sample is degraded, rather than inhibited, and decide which, if any, STR system is most appropriate for downstream analysis. The experiment below illustrates that the [Auto]/[D] ratio is reflective of sample integrity.