Table 1. The 5 byte, version 2, read codes used for recording eGFR in the primary care records of 951,764 people. The CKD-EPI read code was not available at the time these data were recorded
Read codeCode rubricNumber recorded (%)
451FGlomerular filtration rate.16,317 (1.2)
451EGlomerular filtration rate calculated by abbreviated MDRD studygroup calculation.1,292,572 (98.7)
451GGlomerular filtration rate calculated by abbreviated MDRD studygroup calculation adjusted for African American origin.448 (0.04)
451KEstimated glomerular filtration rate using CKD-EPI formula.0 (0.0)