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Pediatric Blood Volume

Kidney damage with normal or increased GFR

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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended

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Why: This calculation helps assess important health parameters for clinical and personal wellness tracking.

How: Enter your values above and the calculator will apply validated formulas to compute your results.

Evidence-based calculationsUsed in clinical settings worldwide
Sources:Medical LiteratureWHO Guidelines

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Understanding Pediatric Blood VolumeUse the calculator below to check your health metrics

Sample Clinical Scenarios

Healthy 8-Year-OldRoutine screening in healthy child
CKD Stage 3 Patient12-year-old with known chronic kidney disease
Infant Assessment6-month-old for kidney function evaluation
Adolescent with AKI15-year-old with acute kidney injury
Kidney Transplant Recipient10-year-old post-kidney transplant

Patient Information

Laboratory Values

Calculation Options

Clinical Context

What is Glomerular Filtration Rate (GFR)?

GFR BasicsGlomerular filtration rate (GFR) is the best overall measure of kidney function. It represents the volume of fluid filtered from the renal glomerular capillaries into Bowman's capsule per unit time, typically expressed in mL/min/1.73m².In children, GFR varies with age, increasing from birth to reach adult values by approximately 2 years of age. Estimating equations like the Schwartz formula are used because directly measuring GFR is impractical in clinical settings.
Why Height-Based Formulas?Pediatric GFR estimation relies heavily on height because creatinine production is proportional to muscle mass, which correlates with height in children. The Schwartz formula was developed specifically for pediatric use.The original Schwartz formula used different k constants based on age and sex, but the updated bedside formula (k = 0.413) is now preferred for modern IDMS-traceable creatinine assays.

CKD Staging in Children

StageGFR (mL/min/1.73m²)DescriptionAction
Stage 1 - Normal or High GFR≥ 90Kidney damage with normal or increased GFRDiagnosis and treatment of cause, CVD risk reduction
Stage 2 - Mildly Decreased GFR60-89Kidney damage with mild decrease in GFREstimation of progression risk
Stage 3a - Mild to Moderate Decrease45-59Mild to moderately decreased GFRMonitor for complications
Stage 3b - Moderate to Severe Decrease30-44Moderately to severely decreased GFRPreparation for kidney replacement therapy
Stage 4 - Severely Decreased GFR15-29Severely decreased GFRReferral to nephrologist, prepare for RRT
Stage 5 - Kidney Failure< 15Kidney failure (ESKD)Dialysis or transplantation needed

Formula Comparison

Schwartz Bedside (2009)Formula: eGFR = 0.413 × Height (cm) / Scr (mg/dL)Best for: Routine screening, modern creatinine assays (IDMS-traceable)Recommended as first-line equation
CKiD Combined EquationUses: Creatinine + Cystatin C + BUN + HeightBest for: Children with known CKD, more accurate in CKD G2-G4Requires cystatin C measurement

Limitations and Considerations

Important Limitations
Creatinine-based formulas may overestimate GFR in:
  • Muscle wasting / malnutrition
  • Limb amputation
  • Vegetarian diet
  • Liver disease
  • Edema / fluid overload
    • Creatinine-based formulas may underestimate GFR in:
  • High muscle mass / athletes
  • High protein diet
  • Creatine supplements
  • After eating cooked meat
    • In these situations, consider cystatin C-based or combined equations, or formal GFR measurement using iohexol or nuclear medicine techniques.

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    Clinical Disclaimer: This calculator provides estimates for educational purposes. Estimated GFR using equations may not be accurate in all clinical situations. GFR estimates should be confirmed with repeat measurements and interpreted in the context of the overall clinical picture. Formal GFR measurement may be needed for critical clinical decisions. Always consult with a pediatric nephrologist for management of kidney disease in children.

    For educational and informational purposes only. Verify with a qualified professional.

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