1. A method for tracking a biological sample comprising DNA of a mammalian subject, the method comprising: a) amplifying the DNA using at least two primers for amplification of at least two respective DNA markers of the DNA of the subject, thereby creating a molecular barcode for the sample; b) associating the molecular barcode with the biological sample; c) performing a diagnostic or prognostic test on the biological sample at the same time as, or after, creating the molecular barcode, thereby generating test data; and d) linking said test data with the molecular barcode, thereby tracking the sample without accidental misidentification of the test data and the subject.