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Tests
Drugs are chemical substances that can change how your body and mind work. A drug test looks for signs of illegal drugs or certain prescription and/or over-the-counter (OTC) medicines that can be misused. The test is usually done with a sample of your urine (pee). Less commonly, drug testing uses a sample of your blood, saliva (spit), hair, sweat, fingernails, or breath. The purpose of a drug test is to look for drug use and misuse, which includes:
Glossary Term
The largest difference between, or ratio of, an instrument's or method's highest and lowest value in a set, such as pixel (voxel) values in an image.
Indicators
This gene plays a role in the negative regulation of transcription.
Article
Research record from Bioanalysis, 2026-07-01. PMID 42584159.
Tests
Electrolytes are minerals that have an electrical charge when they are dissolved in water or body fluids. You have electrolytes in your blood, urine, tissues, and other body fluids. They are important because they help:
Glossary Term
A 50-150bp DNA sequence that increases the rate of transcription of coding sequences. It may be located at various distances and in either orientation upstream from, downstream from or within a structural gene. When bound by a specific transcription factor it increases the levels of expression of the gene, but is not sufficient alone to cause expression. Distinguished from a promoter, that is alone sufficient to cause expression of the gene when bound.
Article
Research record from Carbohydr Polym, 2026-07-04. PMID 42586650.
Indicators
This gene plays a role in DNA repair and regulation of transcription.
Glossary Term
Changes in the regulation of the expression of gene activity without alteration of genetic structure.
Glossary Term
The complete set of epigenetic modifications on the genome of a cell.
Tests
Epithelial cells cover the inside and outside of the surfaces of your body. They are found on your skin, blood vessels, and organs, including your urinary tract (which includes your kidneys, ureters, bladder, and urethra).
Glossary Term
The simplest form of an antigenic determinant, on a complex antigenic molecule, which can combine with antibody or T cell receptor.
