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Company
Drug Monitoring
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Currently under review
Pending specialist review and validation.
Cyclosporine is an immunosuppressant used to help prevent organ rejection and to treat certain autoimmune conditions. This test measures the amount of cyclosporine in your blood right before your next scheduled dose, which is called a trough level. It shows how much drug is present at the lowest point in your dosing cycle and helps your care team understand how your body is processing the medicine.
The sample is collected from whole blood and timed carefully so the draw occurs immediately before a dose. Measuring the trough level is the standard way to monitor ongoing treatment, because it reflects steady exposure over time rather than brief peaks after a dose.
Keeping cyclosporine within an individualized target window helps prevent rejection while reducing the chance of side effects like kidney problems, tremor, gum changes, high blood pressure, and infections. Your clinician may order this test when you start therapy, after dose changes, when other medications are added or stopped, or if your health status changes.
Monitoring is also important if you have kidney or liver issues, experience symptoms that could reflect toxicity or under-immunosuppression, or there are concerns about missed doses. Results help guide dosing, timing, and management of interactions so you stay protected and avoid avoidable harms.
Your care team will set a target level that fits your situation, considering the type of transplant or condition being treated, time since transplant, other medicines, and your overall health. A result below your target may suggest underexposure, possible missed or delayed doses, or faster drug clearance. A result above your target can signal higher exposure and a greater chance of side effects.
Do not change your dose on your own. If your level is outside the target, your clinician may confirm the timing of the blood draw, review your medication list for interactions, assess kidney and liver function, and adjust the dose or schedule. Follow-up testing is often used to confirm that changes are effective and safe.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
The sample should be collected immediately before your next dose. Even small timing shifts can falsely raise or lower the trough level.
Many medicines and supplements change cyclosporine levels. Examples include certain antibiotics, antifungals, calcium channel blockers, anticonvulsants, and herbal products like St. John’s wort.
Changes in kidney or liver health can alter how cyclosporine is handled in the body, affecting levels and the risk of side effects.
Missed, delayed, or extra doses can shift trough levels. Bring an accurate medication list and dosing schedule to your appointment.
Different test methods may read slightly differently. Your team usually interprets results within the context of the same lab and method.
Genetic differences and blood cell characteristics can influence distribution of cyclosporine in whole blood and its measured level.
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