Study on how to measure medicines in the blood

This trial collects small samples like blood, sweat, and saliva while you’re taking certain medicines. Researchers will analyze these samples to see if they can detect chemical levels, which may help improve monitoring for people with chronic or infection-related illnesses.

This study takes small blood samples to learn how the immune system works in healthy people. It may help researchers better understand immune biology for future treatments, while you help by participating in regular research blood draws.

This study follows people who are getting a liver transplant (including repeat transplants) to monitor changes in their body using test results. It may help doctors understand how patients are doing after transplant and improve care over time.

This study checks whether certain lab “biomarker” results from blood samples remain accurate over time. The goal is to validate diagnostic tests by testing samples from healthy adults under controlled conditions.

This trial is studying whether a blood test that measures small molecules called microRNAs can help doctors personalize the medicines used to prevent rejection after a heart transplant. If you qualify, you would help researchers learn how to better match immunosuppression to each patient's needs.

This trial measures how anti-infective medicines move through a child’s body while they are in the hospital or during follow-up. The goal is to better understand dosing and drug exposure in critically ill children.