Agreed with Miriam and Ira.
In order to obtain multiple GMB listings (since the clinic you want to sell the STD tests to will already have its own) for the same location/practice/clinic, you would need to have separate business brands operating within the same office.
Google's My Business guidelines state: “If your business location combines two or more brands, do not combine the brand names into a single page. Instead, pick one brand’s name for the page. If the brands operate independently, you may use a separate page for each brand at this location****.”
In other words, the only way you can obtain multiple GMB pages is if you have two totally different brands working under one roof (and even then you risk Google conflating the listings). Or, of course, if you have multiple practitioners at one location.
Best practice for multiple brands in the same practice location: assure each brand has its own verified suite number from the post office (if possible); each of the two brands within the practice should have their own website; each brand should have its own business category (preferably); and each brand would need to have its own business name and phone number of course.
Andrew: I actually wrote a behemoth or an article that was inspired by the Search Engine Land article you referenced in your original comment: http://www.incrediblemarketing.com/google-my-business-for-doctors
Hope this helped.
