[header] How to collect dna [title] Decide if you need a kit. [step] This will depend on what the sample is for. If you want laboratory results from your sample, you will likely have to purchase a kit. 
If you plan on storing the sample in case it is one day needed, you may not need a kit, although you may still choose to purchase one if you like. [substeps] Dna test kits contain all of the materials you will need, along with complete instructions and consent forms, which are needed if the samples will be tested or kept on file with the authorities.