What are the symptoms? They usually begin with tingling, numbness or prickling in your toes or fingers. This numbness may spread up to your hands or feet and feel like burning, freezing, throbbing and/or shooting pain that is often worse at night. Your pain may come and go or it may be constant.
How DNA Testing Is Done. To do a DNA test, a sample of your cells is required. This sample can be from your blood, saliva, skin cells or even the inside of your cheek. Usually, DNA test samples are taken by a doctor or clinic and sent away to a specialized genetic testing lab where the DNA is separated out from your cells. For a blood test, a needle and syringe would be required to draw a sample of blood. For the saliva sample, you would spit into a tube. For the cheek swap, scraping the inside of your cheek with a large cotton swab should do the job.
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.uide. 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.