Adrenaline is a hormone secreted by the adrenal glands (specifically from the medulla in the adrenaline glands) and from some of the neurons in the central nervous system. Adrenaline is usually secreted when we are in a stressful situation; it is said to regulate our fight-or-flight response conditions. An adrenaline test is performed on a sample of blood or on a sample of urine to measure the level of adrenaline secretion and diagnose whether it is normal for the body. A discrepancy of the resultant level with the standard adrenaline level might be indicative of some serious problems.