Is this change real?
Test whether the difference between two results is more than test imprecision and day-to-day variation, with or without a method change in between.
Free tools
Free calculators for method change
Three calculators for laboratories and clinicians, each built on cited open-access sources. They run in your browser: nothing you type leaves the page.
eGFR after a creatinine method change
See how far a creatinine method change moves eGFR and the KDIGO category for one patient, with no change in the patient.
Analyser comparability lookup
The result you would expect on another analyser, from published open-access method comparisons.