CYCLOSPORINE, BLOOD

Cyclosporine, Blood

What it is

The Cyclosporine, Blood test measures the concentration of cyclosporine, an immunosuppressive drug, in the bloodstream. Cyclosporine is used to prevent organ transplant rejection and to treat certain autoimmune disorders. Monitoring its level helps ensure that the drug is effective in suppressing the immune response while avoiding toxic side effects.

Uses

This test is primarily used in transplant recipients (kidney, liver, heart, lung) to guide dosing and prevent rejection or toxicity. It is also used to monitor patients taking cyclosporine for autoimmune diseases such as psoriasis, rheumatoid arthritis, or nephrotic syndrome. Regular monitoring allows doctors to adjust treatment for safety and effectiveness.

Symptoms That May Lead to the Test

Doctors order this test as part of routine therapeutic drug monitoring in patients on cyclosporine therapy. It may also be requested if signs of toxicity appear, including kidney dysfunction, high blood pressure, tremors, gum overgrowth, or seizures, or if there are signs of transplant rejection or worsening autoimmune disease.

Abnormal Results

High Cyclosporine Levels: May indicate risk of toxicity, which can cause kidney damage, liver dysfunction, high blood pressure, tremors, seizures, or excessive hair growth.

Low Cyclosporine Levels: May indicate insufficient immunosuppression, raising the risk of transplant rejection or autoimmune flare-ups. Dosage adjustments are typically needed.

Risks

The test requires a standard blood draw, often timed either just before (C0 trough level) or a few hours after (C2 peak level) medication dosing, depending on clinical protocol. Risks are minimal and may include mild pain, bruising, or dizziness at the puncture site.