What happens to LAB color when exported to cmyk

I have a workflow at work that goes like this: We work color in Photoshop in Adobe RGB (1998) and convert to our cmyk space only upon output. I've found that, in many cases, I like to work in L*a*b. What happens when an LAB images is placed in InDesign and exported to a pdf to our cmyk space? Thanks!

InDesign can place PSD and TIFF files which are in the LAB color space.
What happens when you export to PDF depends on which PDF preset you use. If you choose PDF/X-1a, the Lab color will be converted to the working CMYK color space (by default US Web Coated SWOP v2, same as in Photoshop). You can test this by examining the resulting PDF in Output Preview in Acrobat 8 Professional or Acrobat 9 Pro.
If you chose PDF/X-3 or PDF/X-4, the color would be unchanged and the PDF would still have the image in LAB color space with the LAB profile that Photoshop created.

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