Serum creatinine output is proportional to muscle mass, meaning that people with more muscle will have higher SCr readings. Similarly, strenuous physical activity can affect both SCr and CrCl readings, given than exercise results in more creatine being converted into energy.2 Indications for Testing ...
The authors did develop cystatin C-based equations, which resulted in better eGFR estimates; however, cystatin C is not a commonly available lab in many areas of clinical practice. GFR(mL/min/1.73m2)=FemaleswithSCr≤0.7mg/dL:142∗(SCr/0.7)−0.241∗0.9938Age∗1.012FemaleswithSCr>0.7...
It is a useful screening test but differences in eGFR of up to 20 mL/min/1.73 m2 may be seen between the Beckman and iSTAT eGFR values at higher levels, meaning numeric eGFR results are not interchangeable.Hawkins RClinical Chemistry
Although weak, an association between UPCR and creatinine values (r= 0.379) was observed, meaning that increased proteinuria is linked to more severe CKD. This is in line with previous studies supporting the relevance of UPCR in the progression of CKD [6,11,18]. ...