Purpose: The cortisol injection test, also known as the ACTH stimulation test, is performed to evaluate the adrenal glands' ability to produce cortisol in response to adrenocorticotropic hormone (ACTH). This test helps in diagnosing adrenal insufficiency or monitoring treatment for conditions such as Addison's disease. Preparation: Your healthcare provider will provide specific instructions to prepare for the test. This might include fasting for a certain period before the test, avoiding certain medications that can interfere with cortisol levels, and sometimes stopping oral corticosteroid medications prior to the test. Procedure: During the test, a healthcare professional will administer a synthetic form of ACTH via injection, usually into a muscle or vein. After the injection, blood samples are taken at specified intervals (often 30 minutes, 60 minutes, and sometimes additional times) to measure cortisol levels. Monitoring: Throughout the test, healthcare providers will monitor you for any adverse reactions and collect blood samples as scheduled. It's essential to remain relaxed during the test to avoid artificially elevated cortisol levels due to stress. Interpretation: The cortisol levels measured in the blood samples provide information about the adrenal glands' response to ACTH stimulation. In individuals with normal adrenal function, cortisol levels typically rise significantly after ACTH administration. Abnormal results may indicate adrenal insufficiency or other adrenal gland disorders. Follow-up: Depending on the test results, further testing or treatment may be necessary. Your healthcare provider will discuss the results with you and recommend appropriate steps based on the findings.

Allergic reactions: Though rare, there is a risk of allergic reactions to the synthetic ACTH or other components of the injection. It's important to screen patients for any known allergies beforehand. Adverse reactions to the injection itself: As with any injection, there is a risk of pain, bruising, or infection at the injection site. Proper sterile techniques should be followed to minimize these risks. Hypoglycemia: Administration of synthetic ACTH can sometimes lead to a temporary decrease in blood glucose levels, particularly in patients with underlying conditions such as diabetes. Monitoring blood glucose levels and having appropriate measures in place to address hypoglycemia is important. Hypertension: In some cases, the injection of synthetic ACTH can lead to a transient increase in blood pressure. Patients with underlying hypertension should be monitored closely during the procedure. Adrenal crisis: In rare cases, the ACTH stimulation test can precipitate an adrenal crisis in patients with severe adrenal insufficiency. Careful patient selection and monitoring are crucial to minimize this risk.

Range: The normal range for cortisol levels in the blood can vary depending on the time of day and individual factors. In general, normal cortisol levels are typically between 6 and 23 micrograms per deciliter (mcg/dL) in the morning and lower in the evening.

Interpretation: Interpretation of cortisol levels depends on various factors, including the time of day the test was taken, the individual's medical history, and the presence of symptoms. Abnormal cortisol levels may indicate adrenal gland dysfunction or other underlying health issues.

Sample Type Summary: Cortisol levels can be measured through blood, saliva, or urine samples. Blood tests are the most common method and are often done in the morning when cortisol levels are highest.