The hormone cortisol has a significant impact on physical and emotional states, like mood, motivation, and fear. It originates in the zona fasciculata of the adrenal or suprarenal glands. The endocrine glands on top of your kidneys also produce cortisol. The steroid hormone is responsible for regulating the stress response of the human body. Hence it is also called the stress hormone. The hormone also has several significant functions, like: Controlling the metabolism of carbohydrates, proteins, and fats  Blood pressure regulation  Blood sugar control  Sleep-wake cycle control  Inflammation suppression For your body to function normally, it needs to maintain homeostasis of the hormone levels. Too much or too little of the hormone can adversely affect your health. In case of excess cortisol in the body, various diseases can occur. Two instances would be: Cushing syndrome or hypercortisolism: This disease occurs due to excess cortisol levels in the body.  Addison's Disease or hypocortisolism: This disease causes failure of adrenal glands, due to low levels of cortisol aldosterone. If left untreated, it can cause Addisonian Crisis which is fatal. The Cushing syndrome has some of the following symptoms: Excessive fatigue Weak muscles  Anxiety and depression Poor cognitive abilities  Headache  High blood pressure or hypertension Susceptibility to infections  Loss of emotional control  Altered sex drive  Obesity Addison's disease has some similarities as well as a few other symptoms, like: Severe fatigue  Depression Excessive body hair loss in women  Hyperpigmentation  Appetite loss  Loss of weight Craving for salt  Low blood pressure or hypotension  Hypoglycemia or low blood sugar  Pain in the abdomen, muscles, and joints Nausea Diarrhea  Sexual dysfunction in women  Irregular menstrual cycle The Random Cortisol Serum Test or Cortisol blood test is a way to detect the cortisol level in your blood. It is also known as a Cortrosyn Stimulation Test or dexamethasone suppression test. It can also detect any disorders of the adrenal gland and can be prescribed by the medical practitioner if any of the above symptoms persist. The serum cortisol test is similar to a regular blood sample test. A lab technician or healthcare professional collects a sample of your blood via venipuncture. The procedure has no significant side effects, but you may feel slight pain and light-headedness. In rare cases, blood can clot beneath your skin and form a hematoma, but it is not fatal. You can get this test done by an Apollo 24|7. However, you should prepare well before the sample collection. Cortisol levels in the body vary throughout the day and are at the highest level in the morning. So, even though you need to fast, you must provide the sample in the morning. You also need to abstain from using anti-seizure drugs, drugs consisting of estrogen, and synthetic glucocorticoid medications, like prednisone. These can raise the cortisol level in the body. Similarly, refrain from using androgens or phenytoin since these can lower the cortisol level. You must also stay relaxed before the Cortisol Level test since stress and illness can also impact the hormone level. Although Cushing's syndrome is curable, there is no permanent cure for Addison's disease. However, depending on your diagnosed condition, your doctor can prescribe you medicines, diets, and changes in lifestyle that will help in both cases.