Calculator Input Form
Example Data Table
| Example case | Age | Sex | Height | Scr | Cystatin C | BUN | Bedside Schwartz | Cystatin C | Combined CKiD |
|---|---|---|---|---|---|---|---|---|---|
| Sample child | 10 years | Male | 130 cm | 0.60 mg/dL | 0.95 mg/L | 14 mg/dL | 89.48 | 74.15 | 83.41 |
Values are example inputs to show workflow and report layout. Clinical use should always consider laboratory method, patient age, and local practice standards.
Formula Used
1) Bedside Schwartz (2009)
This is the fastest estimate and is commonly used when only height and standardized serum creatinine are available.
2) Cystatin C Equation (2012)
This estimate can be helpful when creatinine-based estimates may be less representative or a second marker is needed.
3) Combined CKiD Equation (2012)
Sex factor is 1.076 for males and 1.00 for females. This estimate combines multiple laboratory markers and body size to provide a broader pediatric estimate.
Displayed GFR category
These categories help organize the output, but interpretation still depends on the full clinical picture.
How to Use This Calculator
- Enter age, sex, height, and serum creatinine.
- Choose the correct height and creatinine units.
- Add cystatin C if you want cystatin-based estimates.
- Add BUN to unlock the combined CKiD equation.
- Tick the IFCC box when cystatin C is reported as IFCC calibrated.
- Press the calculate button to show results above the form.
- Review the preferred estimate, all method outputs, stage label, and graph.
- Use the CSV or PDF buttons to save the report.
Frequently Asked Questions
1. Which result should I focus on first?
This file highlights the combined estimate when enough data exist. If combined inputs are missing, it shows the bedside result as the main displayed estimate.
2. Why do different equations give different values?
Each equation uses different markers and assumptions. Creatinine, cystatin C, and BUN can reflect kidney function differently across patients and lab settings.
3. Is cystatin C required?
No. The bedside equation only needs height and serum creatinine. Cystatin C is optional and expands the calculator to extra pediatric estimates.
4. Why is there an IFCC checkbox?
Some cystatin C results are IFCC calibrated. This file adjusts those values before using the pediatric cystatin formulas.
5. Why does the calculator ask for sex?
Sex is used by the combined CKiD equation. The bedside equation does not need sex, but the advanced report does when combined output is requested.
6. Can I use creatinine in µmol/L?
Yes. The file converts µmol/L to mg/dL automatically before calculation, so the formulas still run in their expected units.
7. Does a single eGFR value diagnose chronic disease?
No. A single estimate supports assessment, but diagnosis usually requires broader clinical context, repeated evaluation, and clinician judgment.
8. What do the CSV and PDF buttons export?
They export patient labels, normalized inputs, the preferred estimate, stage label, and every calculated method shown in the report.
Clinical Caution
- This calculator is for educational and workflow support use.
- It does not replace pediatric nephrology review, lab method checks, or direct measured GFR when needed.
- Always interpret kidney estimates alongside symptoms, urinalysis, trend data, imaging, and the clinical setting.