How to save a photoshop image for indesign and preserve the pantones?

I'm having a terrible time trying to get a photoshop image to export to an indesign file. The colors need to be in pantone as it will be printed, but whether I export to pdf or import the raw psd file into the indesign document, the colors always come up as cmyk.

I used this tutorial on getting the colors as the precise pantones I need: http://ift.tt/1zL8ono

And, as I understand it a photoshop image needs to be saved as a pdf in order for the pantones to be used in indesign, but for some reason they keep getting imported as cmyk.

Any help would be appreciated. I'm truly baffled. :\

Thanks.