Estimating GFR when creatinine lies
Teaching case
[Insert slide gallery: case slide images. Placeholder pending assets.]
Clinical stem
[Age, CKD stage, diabetes status, medication list, volume status, key labs.]
The trap
[What clinicians might miss.]
Diagnostic reasoning
Low or high muscle mass and the case for cystatin C and the CKD-EPI 2021 combined equation.
Safety pearl
[What to monitor.]
What not to overclaim
[Limits of the evidence.]
Educational only
Illustrative teaching case, not individual medical advice.