The way I read #6 in the FAQs, we have to index to body size to properly compute kidney disease.
https://www.kidney.org/sites/default/files/441-8491_2202_faqs_aboutgfr_v5.pdf
this seems to be the right way to read #6. But compare that to the following that seems to indicate to use the index of the standardized body mass for determining CKD and use the actual height and weight for dosing purposes
“Choosing “No” will calculate an indexed eGFR value, standardized to a body surface area of 1.73m2 (units: mL/min/1.73m2)
Assessment for CKD staging and CKD progression should generally be assessed using the indexed eGFR value.
Choosing “Yes” will bring up fields to input height and weight. A non-indexed eGFR value (i.e. adjusted for the patient’s body surface area) will be calculated (units: mL/min).
Drug dosing decisions should generally be based on non-indexed eGFR value.
Exception: Using non-indexed eGFR in morbidly obese patients can result in a large overestimate of measured GFR and potential for overdosing.”