Weekly biological variation of serum biochemistry analytes and fibroblast growth factor 23 in healthy cats and cats with chronic kidney disease

Biological variation estimates for each analyte were similar between healthy cats and those with chronic kidney disease. All analytes had intermediate to high individuality in cats with chronic kidney disease; thus, determining a cat's baseline and applying the reference change values to subsequent measurements may enhance the detection of clinically relevant changes that could be missed when using population-based reference intervals.