What Is a DNA Test and What Information Can It Reveal?

What Is a DNA Test?
Over the past few years, DNA testing has emerged as one of the most reliable scientific tools used to identify biological relationships, determine genetic traits and assist in legal investigations. DNA analysis can give highly accurate results whether one wants to confirm family relations, verify parentage, or to gain insights into their genetic background.
So what is a DNA test and what does it tell? When an individual is considering using DNA testing to find answers to key personal, medical or legal questions, it is important that he or she understands the purpose and the possibilities of the test. 
Understanding DNA and How Testing Works
DNA (Deoxyribonucleic Acid) is the genetic material present in almost all the cells of the human body. It contains instructions that govern many of the physical and biological traits that are passed down from parents.
A DNA test involves looking at certain markers in a person’s DNA, and comparing them to a sample or a database of known DNA. Samples are usually taken with a painless swab of the inside of your cheek, but they can also be taken from blood, hair roots or other biological tissue depending on the specific test.
The samples are then sent to a laboratory where they are tested with sophisticated methods in order to look for patterns of similarity, differences, or inherited patterns of genes. 
What Information Can a DNA Test Reveal?
The most frequently performed application of a DNA test is to establish a biologic kinship between people. It can identify family ties, such as parent-child or siblings. 
1. Biological Relationships
One of the most common uses of a DNA test is confirming biological relationships between individuals. It can determine whether people share a parent-child relationship, siblingship, or other family connections.
For example, if there is uncertainty regarding a child’s biological father, a DNA Paternity Test can provide clear and scientifically supported results. Such testing is widely used in family matters, legal cases, and personal verification.
2. Family Lineage and Ancestry
Many people use genetic testing to learn about their family origins. DNA analysis can reveal ancestral roots, ethnic backgrounds, and migration patterns that may date back hundreds or even thousands of years.
Someone who knows very little about their family history may discover connections to different regions, communities, or populations through genetic markers inherited from previous generations.
3. Genetic Traits and Inherited Characteristics
DNA can also be used to yield information on inherited traits. Some of the traits like eye-color, hair texture, and other physical attributes are determined by genes.
An understanding of the inherited genetic factors can help people know more about the genetic causes of their individual differences. 
4. Forensic Identification
In a criminal investigation and identification, genetic testing is often used by forensic experts. DNA taken from evidence can be matched with that of a suspect or a missing persons’ database.
In the decades since, the use of genetic analysis has been instrumental in solving thousands of cases, and it is now a trusted scientific tool in cases where other means fall short. 
5. Family Verification for Legal Purposes
Under legal and administrative circumstances, DNA testing could be used to determine family relationships. Genetic evidence is used to confirm claims in immigration applications, inheritance cases, custody cases and court proceedings.
A legally acceptable DNA Paternity Test is conducted in accordance with a strict chain of custody to help ensure that the test is accepted and that it is accurate. 
Practical Examples of DNA Testing
To better understand how genetic testing is used in everyday life, consider the following examples:

A father wants confirmation of a biological relationship with his child.
Siblings separated during childhood wish to verify their relationship.
Families involved in inheritance disputes require scientific proof of lineage.
Law enforcement agencies use genetic evidence during investigations.
Individuals explore their ancestral roots and family history.