Ko tētahi o ngā āhuatanga tino nui o ngā kirihou PCR ko ō rātou tohu taiao. Ka hangarua e te PCR ngā kirihou mai i ngā moana mā te whakamahi i ngā rauemi kei roto i te mekameka tuku. Mā te whakamahi i te PCR ka whakaitihia tō tapuwae waro. He iti ake te kaha me te whakamahinga wahie pūngao e hiahiatia ana mō te hanga takai mai i ngā rauemi kaihoko-muri. Hei tāpiri, he tino ngāwari te hanga i ngā kirihou PCR, ā, ka taea te hanga ki tētahi āhua, ki tētahi rahi rānei e hiahiatia ana.

I te mea he ture e whakahau ana i te whakamahinga o ngā rauemi hangarua o muri i te kaihoko i roto i ngā whenua maha o te ao, mā te neke whakamua ka āwhina i a koe ki te whai i ngā ture. Mā te whakamahi i te PCR ka tāpirihia he huānga kawenga ki tō waitohu, ā, ka whakaatu ki tō mākete e manaaki ana koe. Ka nui te utu o te tukanga hangarua, te horoi, te whakarōpū me te whakaora. Engari ka taea te whakakore i ēnei utu mā te hokohoko tika me te tūnga. He maha ngā kaihoko e pai ana ki te utu i te utu teitei ake mō ngā hua kua tākaihia ki te PCR, ka nui ake te uara o tō hua, ā, ka nui ake pea te hua.