A CRNI (Certified Registered Nurse Infusion) is a specialized nurse trained in administering intravenous (IV) therapy and infusion treatments. They work in hospitals, clinics, and home care settings, ensuring patients receive safe and effective IV medications, fluids, and nutrition. CRNIs are certified through the Infusion Nurses Certification Corporation (INCC) and must demonstrate expertise in infusion therapy. Their responsibilities include monitoring patients, preventing complications, and educating both patients and healthcare teams on best infusion practices.