First, file a patent. Then get your study published by a medical journal.

How far has your research gone? Do you have results from infected patients or just from culture lines? Have you made comparative trials vs. all of the current methods?

Pharma companies will ask questions like these before they get interested in your idea, but at this early stage their support may consist simply in funding more studies. And you will absolutely need to get studies published, even before you call a pharma company, to make your idea visible.

But ultimately, adopting your method as the standard is not so much the pharma company's decision. Doctors won't routinely use it until it's endorsed by a guideline document from whatever association of infectologists publishes those guidelines, and those guidelines are only published every few years or so, at their big meetings. And they'll want to see LOTS of confirming studies before they say everyone should use it.

Whatever pharma company buys your method may also need to show the studies to the FDA before they can legally promote it.

So, congratulations for making history, and brace yourself for years of paperwork.

(Don't get too stressed. You'll laugh at it all after the Nobel committee hears of you.)