Compares a child's sonographic renal length against height-based normative values (Obrycki 2021).
Written for clinicians. If you're a parent or patient, don't act on these numbers — talk to your child's doctor.
| Field | Unit | Notes |
|---|---|---|
| Height / length | cm | 45–200 |
| Measured renal length | mm | Millimetres (a 9 cm kidney = 90 mm) |
| Solitary functioning kidney? | — | Agenesis, MCDK, post-nephrectomy, single moiety |
Compares a child's sonographic renal length against height-based normative values (Obrycki 2021).
Height / length (cm), Measured renal length (mm), Solitary functioning kidney?.
Reference derived in a Central-European cohort; interpret alongside the clinical picture and your local norms.
Paediatric estimated GFR using the bedside Schwartz (2009) equation.
Urine anion gap to assess renal NH4+ excretion in normal-anion-gap metabolic acidosis.
Fraction of filtered sodium excreted in urine — helps distinguish prerenal from intrinsic (ATN) acute kidney injury.
Fraction of filtered urea excreted in urine — distinguishes prerenal from intrinsic AKI and stays valid in patients on diuretics.
Estimates the driving force for potassium secretion in the cortical collecting duct — used to work up hyper- and hypokalaemia.
Estimates serum osmolality from sodium, glucose and urea — compare with a measured value to derive the osmolar gap.
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