"Precise Medical Gas Systems, Keeping Patients Safe." CYA (Carsten's Yearly Analysis, Inc.) is a full-service medical gas system company serving the Western United States. Our headquarters resides in the San Francisco Bay Area, with strategically-placed representatives throughout Northern California. We specialize in medical gas system safety for healthcare facilities. Testing, inspections, certifications, repairs, equipment sales, rentals, preventative maintenance, in-service training, design consultation, and ASSE medical professional credential courses...you'll find them all at CYA. We can respond to medical gas system emergencies 24/7. CYA, Inc. was a trendsetter in developing mobile testing labs. Using precision and scientific instruments we are capable of measuring piping purity & particulate samples in the field within the code required analytical accuracies. We know the clinical consequences when medical gas is not precisely tuned. What a difference it makes to your environment of care. That precision is our motivation for every test and every training. Your priority is your patients. Our priority is keeping them safe.