Why would dr request lft, u&e and creat before mri instead of just egfr?

It might be in preparation for a specific procedure/ treatment/surgery providing the MRI confirms findings on physical exam and the need for an intervention, feel free to ask your treating doc to clarify.

Too many abbreviations. Please use proper names to facilitate understanding and then proper advice.

If dye is to be used in the study most protocols call for determination of the BUN or creatinine levels to assess.kidney function. The estimated glomerular filtration rate may or may not be added in by the lab although.it's a very good assessment of kidney function & may be superior to the creatinine level which has more variables.