Lateral flow tests, also known as lateral flow assays, are simple diagnostic tools used for rapid detection of specific substances such as antigens, antibodies, proteins, and even DNA and RNA molecules in biological samples, such as blood, saliva, or urine. They operate on the principle of immunochromatography, utilizing specific antibodies or other recognizing molecules to identify the analyte in the sample. The test consists of several key components placed on a membrane strip, allowing capillary flow of the sample. In this process, the sample migrates through the reagent area, where if the target is present, it forms a complex with labeled recognizing molecules. This complex then moves further to the test line, where, in the case of a positive result, it becomes bound, forming a visible line. The test also includes a control line, confirming the proper conduct of the test. These tests are valued for their speed, simplicity, low cost, and the ability to be performed without the need for specialized equipment, making them ideal for rapid on-site testing.