Tiselius Risk Index Supersaturation

Calculate Tiselius activity product ratio (APR) for calcium oxalate stone formation from 24h urine parameters. APR >1 indicates supersaturation and active lithogenic risk.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
Advertisement

How It Works

Calculate Tiselius activity product ratio (APR) for calcium oxalate stone formation from 24h urine parameters. APR >1 indicates supersaturation and active lithogenic risk

Each component has a specific meaning:

  • 24h urine parameters — The 24h urine parameters recorded for the scenario being assessed.

Note: Interpret the tiselius risk index result against the thresholds and context described above.

How to Use

Enter the 24h urine parameters for the scenario you are assessing. Calculate Tiselius activity product ratio (APR) for calcium oxalate stone formation from 24h urine parameters. APR >1 indicates supersaturation and active lithogenic risk. Use the tiselius risk index result to inform your calculation.

Related Calculators

24h Urine Stone Risk

Hyper-niche Medical

Frequently Asked Questions