PSA Doubling Time (PSADT)

Calculate PSA doubling time using PSADT = ln(2) / slope of ln(PSA) vs time regression. PSADT < 3 months indicates aggressive biology; 3-12 months intermediate risk; > 12 months favourable prognosis after primary treatment.

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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.
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How It Works

Calculate PSA doubling time using PSADT = ln(2) / slope of ln(PSA) vs time regression. PSADT < 3 months indicates aggressive biology; 3-12 months intermediate risk; > 12 months favourable prognosis after primary treatment

Each component has a specific meaning:

  • PSADT = ln / slope of ln vs time regression — The psadt = ln / slope of ln vs time regression recorded for the scenario being assessed.

Note: Interpret the psa doubling time result against the thresholds and context described above.

How to Use

Enter the PSADT = ln / slope of ln vs time regression for the scenario you are assessing. Calculate PSA doubling time using PSADT = ln(2) / slope of ln(PSA) vs time regression. PSADT < 3 months indicates aggressive biology; 3-12 months intermediate risk; > 12 months favourable prognosis after primary treatment. Use the psa doubling time result to inform your calculation.

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Frequently Asked Questions