The World Health Organization’s Essential Medicines List has been around for decades and provides the rest of the world’s health organizations a basis for creating their own cost-effective formularies. Well what use is a list of essential medicines if we don’t know who to treat with them? To that end, the WHO has released the Essential Diagnostics List. It’s designed to diagnose the world’s most common diseases, as well as “priority diseases,” like HIV and malaria. The list currently includes 113 tests, but expect that to grow in the next few years as the WHO gets more feedback. Speaking of essential lists, here’s 33 Essential Life Hacks. Disclaimer: Buzzfeed and the WHO probably have a wildly diverging understanding of what “essential” means.