what genetic tests are commonly performed
Genetic Test. Guide. A genetic test examines the DNA (deoxyribonucleic acid) of a person's cells. Genetic testing can identify changes in genes or can analyze the number, arrangement, and characteristics of the chromosomes.Testing may be performed on samples of blood, semen, urine, saliva, stool, body tissues, bone, or hair.enetic Test. Guide. A genetic test examines the DNA (deoxyribonucleic acid) of a person's cells. Genetic testing can identify changes in genes or can analyze the number, arrangement, and characteristics of the chromosomes.