The Division of Rheumatology at CHOP is looking to engage healthy participants for several research studies with the goal of learning more about ways to improve the health and well-being of children and young adults.

The purpose of this study is to see if two biomarkers, called CP and PCT, can help physicians identify when patients have an infection versus a flare of their sJIA.

This study hopes to revise the currently used criteria for diagnoses of Juvenile Idiopathic Arthritis (JIA).

The purpose of this research study is to collect information over time in juvenile SpA and back pain patients.

The purpose of this study is to see if a new investigational drug (Upadacitinib) is safe and well tolerated and also to determine the appropriate dose for subjects with polyarticular course juvenile arthritis (pcJIA).

The purpose of this registry is to study the long-term effects and safety of Abatacept(Orencia) as used for the treatment of Juvenile Idiopathic Arthritis(JIA). JIA patients that are currently taking Abatacept may be eligible to participate in this study.