Link to a video of Dr. Larson explaining nomographs and puppy follow-up testing (after a nomograph has been done for the breeding dam). Video length is a bit over 30 minutes, but playback speed can be increased.
https://drive.google.com/file/d/1Yv8MiMFp_E2tzw1Vfk0FIiORs_DoU3d6/view?usp=sharing