Inputs
Enter values
Anthropometrics (used for LBM, default kidney mass estimate)
Units:
Important: Non-Standard Renal Anatomy Considerations
For patients with single kidney (congenital or post-nephrectomy), horseshoe kidney, renal transplant, or marked asymmetry/atrophy, both:
For patients with single kidney (congenital or post-nephrectomy), horseshoe kidney, renal transplant, or marked asymmetry/atrophy, both:
- Renal mass (affects estimated O₂ demand / VO₂), and
- Renal blood flow distribution (affects effective O₂ delivery / DO₂)
In these scenarios, results are best treated as screening-level physiology, not precise organ quantification.
Kidney Measurements (CT / Ultrasound) (optional override)
Enter 3 dimensions per kidney
Right kidney L × W × D
Left kidney L × W × D
Tip:
Kidney dimensions are expected in centimeters (cm).
If values appear unusually large (e.g., entered in millimeters), they will be
automatically converted. Decimal commas (e.g.,
11,5) are also accepted.
Oxygen Content & Hemodynamics (current patient state)
NOTE:
k is a modeling constant that links kidney mass to estimated renal VO₂.
Leave blank to use the default (0.08).
"Effective Renal Fraction"
represents usable renal oxygen-delivery fraction (not directly measured RBF). Baseline is set within the normal range (default 0.25). Modifiers (starting with CHF) reduce the effective fraction used in downstream calculations; baseline remains normal physiology.
Effective Renal Delivery Modifiers (affect effective renal fraction)
pick what applies
Warning:
Vasopressors may raise blood pressure yet fail to improve, and may worsen renal medullary oxygenation while improving oxygenation of the renal cortex. Their net renal effects are highly context-dependent and therefore are not included in this calculation.
Renal Metabolic Efficiency Modifiers (affect VO₂/“efficiency coefficient”)
worst single modifier wins
Outputs
Body & Kidney Metrics (derived)
baseline physiology
BMI kg/m²
(pending)
BSA (Mosteller) m²
(pending)
Lean body mass kg
(pending)
Kidney volume (total) mL
(pending)
Kidney mass (total) g
(pending)
Kidney mass source
(pending)
Total blood volume (Nadler) L
(pending)
Hemoglobin mass g
(pending)
Global DO₂ Index (DO₂i) mL/min/m²
(pending)
Significant global oxygen delivery deficit detected.
Systemic DO₂ index of XX mL/min/m² is below published safety thresholds associated with a significantly increased risk of AKI, even before renal-specific modeling.
Critical global oxygen delivery deficit detected.
Systemic DO₂ index of XX mL/min/m². DO₂i values below YY mL/min/m² are associated with a critical risk of organ dysfunction in published research literature, independent of renal-specific modeling.
Oxygen Content & Delivery (systemic → renal)
CaO₂, DO₂
CaO₂
(Oxygen Content) mL O₂/dL
(pending)
Total O₂ carrying
capacity (systemic) mL O₂/min
(pending)
Renal Blood Flow L/min
(pending)
DO₂ (renal, effective) mL O₂/min
(pending)
Consumption, Stress, and Targets (VO₂, OER, Hb solver)
core logic
VO₂ (renal estimate) mL O₂/min
(pending)
VO₂ coefficient mL/min/g
(default 0.08)
Renal metabolic efficiency (applied) unitless
(pending)
OER
(Raw) %
(pending)
OER (Augmented) %
(pending)
Required OER (target) %
15% (default target)
Minimum Hemoglobin
to reach OER of 15% g/dL
(pending)
Hemoglobin deficit
(kidney-related) g/dL
(pending)
Inner Medulla Guidance (primary vulnerability target)
Derived from renal OER (slope model). IM baseline OER target 85% or less.
Inner Medulla OER
(derived, capped at 100%) %
(pending)
Inner Medulla OER
stress threshold %
85.0
Inner Medulla status
(current)
(pending)
Hb needed to reach
Renal OER of 15% g/dL
(pending)
Guidance
(pending)
Global DO₂i if Hb corrected to renal OER target of 15% mL/min/m²
(pending)
This IM section is derived from the renal augmented OER using a conservative slope model anchored at:
renal OER 15% → IM OER 85% (baseline target) and renal OER 35% → IM OER 100% (failure point). IM OER is shown uncapped for research purposes.