A DNA paternity test is the most accurate method one can use in order to establish the biological paternity of a child. The most simple and accurate method of collecting a DNA sample for the test is through the use of oral swabs. These oral swabs are generally sent to the person ordering the test by the testing company, and DNA is collected by simply rubbing the cotton tip of the swab inside the mouth in order to collect cheek cells and saliva (visit our section Collecting and Sending Samples).
However there are some cases in which it is not possible to use oral swabs in order to carry out a DNA paternity test, for example in cases where the alleged father is deceased or unavailable for testing. In these cases, it may be possible to use what are described as ‘alternative samples’, as a source of DNA to be used for testing. These alternative samples include a wide range of objects that may contain human DNA, and include hair, cigarette butts, pieces of clothing stained with bodily fluids such as blood or semen, and used tissues. These DNA samples can all be sent to your DNA testing company, who will then be able to extract DNA from them for testing purposes.
Key Issues with Non-Standard Samples for DNA Testing.
However, it is important to keep in mind that these kind of samples have varying rates of successful DNA extraction, according to the type of sample, as well as the conditions in which it is kept and any possible contamination of the sample. For example, although hair can be submitted as a DNA sample, it needs to have the roots attached, and at least 6-8 hairs submitted in order to ensure enough DNA is available to carry out a test. Additionally, DNA will tend to deteriorate with time, so samples that are old may not have enough viable DNA to enable a test to be performed. It is also important to avoid, as much as possible contamination of the samples, so it is important to store them in a clean, dry place until they are sent to the laboratory.
Generally speaking, testing companies will provide information on the types of alternative samples they are able to analyse, as well as an average percentage probability of DNA being successfully extracted from the different kinds of samples. It is also important to keep in mind that DNA testing with alternative samples is generally more expensive than tests carried out using oral swabs, this is due to the fact that the extraction of DNA from these kinds of samples is generally more time-consuming and requires the use of more advanced technology.
Therefore it is always advisable to obtain a quote from your testing company before submitting these kinds of samples, the testing company personnel will also be able to advise you on the viability of your particular ‘alternative sample’ for testing purposes, according to your particular case.
