Renal Split Function Calculator
Differential (split) renal function from background-subtracted kidney counts
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Split function is the percentage each kidney contributes to total renal function, taken from the uptake phase of a dynamic renogram (background-subtracted, geometric-mean corrected where posterior counts alone are insufficient). Enter each kidney's counts to compute the split.
Split (differential) renal function — geometric mean
Background-subtracted counts in the 1–2.5 min uptake window. With anterior counts, each kidney uses the geometric mean √(ant×post) (depth-independent); otherwise posterior only. Normal ≈ 50/50; <45% suggests reduced contribution.
Evidence & sources
BSNMMI/EANM renal scintigraphy guideline — differential function from background-subtracted, geometric-mean-corrected counts.