DNA Testing Resources
Overview
Non-standard samples
Chain of Custody
Results Interpretation
DNA 101
Overview
How is Nuclear DNA Organized?
Why is Autosomal DNA Ideal for Identity and Parentage Testing?
What is the basis for autosomal STR testing?
Steps in DNA Sample Processing
Raw STR Data
Interpreting STR Results in a Paternity Test
Y-STR Analysis
Mitochondrial DNA Analysis
DNA Glossary
Give us a Call1-800-DNA-TEST
Find a Collection Center
Orchid utilizes a network of over 5000 collection sites worldwide.
Orchid utilizes a network of over 5000 collection sites worldwide.
Accreditations
Orchid Cellmark holds multiple accreditations from various organizations and adheres to the standards of each accrediting organization. Compliance by our laboratories to these accreditation requirements provides assurance to our clients that test results provided by Orchid Cellmark are of the highest quality. Clink on the links above to learn more about our accreditations.
Orchid Cellmark holds multiple accreditations from various organizations and adheres to the standards of each accrediting organization. Compliance by our laboratories to these accreditation requirements provides assurance to our clients that test results provided by Orchid Cellmark are of the highest quality. Clink on the links above to learn more about our accreditations.
DNA Testing Resources
DNA 101
Raw STR Data
The picture below represents actual results from an STR (Short Tandem Repeat) test. The profile at each STR region (e.g. D3S1358, THO1, etc.) appears as one or two peaks. The size of each peak represents the number of times that the STR is repeated in that person. For example, at the D3S1358 locus, the STR is repeated 14 times on chromosome 3, at that site, and it is repeated 17 times on the other chromosome 3 (chromosomes in humans occur in pairs). The STR profile for this individual at the D3S1358 site would be listed as 14, 17. A similar STR profile is generated for each person involved in the DNA identity test.
