Compliance is the most critical factor in this category. Products must hold ISO 13485 certification for medical device manufacturing. For the US market, FDA 510(k) clearance is mandatory, while the European market requires CE Marking (IVDR compliance). Technical specs should include a shelf life of 18-24 months, a rapid result read time of 5 minutes, and built-in procedural controls (the 'C' line) to verify the test's validity. For high-security environments, look for kits with adulteration strips that detect pH, creatinine, and oxidants to prevent sample tampering.