Type 2 Kidney numbers

My last annual diabetes review led eventually to a kidney disease diagnosis as well. The "out of range" result was expressed in a (mg) to (mmol) ratio but all the online values express the ratio in (mcg/L) to (mg/L). Can anyone help me to translate the first into the second, please? For instance each comes up with a specific number. The online guidance is that anything below 30 is good. My reading however is 5.4 which is obviouslly a totally different measure to the online one and will equate to something above 30 .... but what? Is there a conversion formula?

Thanks. That helped me look further into it and the stumbling block is how to convert mmol to mg and I'm getting the sense that it isn't a simple conversion. There's maybe another parameter needed that's beyond me, eg from a Google search:

"How do you convert Millimolar to micrograms?
A 1 millimolar solution of a compound is equal to the kDa mass of the compound converted to µgs/µl. For example a 1 millimolar solution of a 50 kDa protein is 50 µg/µl."

It's time I think to ask a relevant medic. to do the calculation for me. Thanks for your help.