The Cyclosporine test measures the level of cyclosporine in the blood. Cyclosporine is a medication used to prevent organ rejection after a transplant. It works by suppressing the immune system, which can increase the risk of infection. The Cyclosporine test is used to monitor the amount of the drug in the blood to ensure that the dose is therapeutic and not toxic. The test is usually ordered at regular intervals after a transplant to ensure that the patient is receiving the correct dose. The test may also be ordered if the patient experiences symptoms such as a fever, fatigue, or gastrointestinal problems, which could be signs of drug toxicity. The test involves a blood draw, and the results are typically available within a few days.