Same Lab - Same Creatinine levels - Different egfr's
Due to other health problems in addition to "ckd" my blood is tested every 3 weeks. I go to the same lab each time for testing. I keep track of my results over time. I noticed something of interest that I point out to others who track their Creatinine and Egfr. As we know Egfr is a calculation based up
Creatinine level, age, sex, race. Well here are some interesting results recently for me, all at the same constant age, sex, race. Notice that the same Creatinine level, is reported as a DIFFERENT EGFR level. Let's say that again for clarity. All the inputs to the Egfr formula are the same (creatinine, age, sex, race) yet the resulting eGFR is Different.
Creatinine 1.7, Egfr 40
Creatinine 1.6 Egfr 43
Creatinine 1.8 Egfr 38
Creatinine 1.8, Egfr 40!!!
Creatinine 1.7 Egfr 40 !!!!
Creatinine 1.75 Egfr 38
Creatinine 1.8 Egfr 40. !!!!
So I looked online. Several online calculators from reliable websites such as National Kidney Organization, Quest Diagnostics. They report;
1.7 Creatinine , EGFR 40
1.75 Creatinine, Egfr 73
1.8 Creatinine, Egfr 37
Same Creatinine levels produce different eGFR results, even at the same lab (i.e. 1.8 is 38gfr sometimes, 1.8 is 40 egfr sometimes, other labs 1.8 egfr is 37.