Adrenal Washout Calculator
The adrenal washout calculator is a tool that you can use to diagnose an adrenal adenoma.
What Adrenal Washout Calculator does
The Adrenal Washout Calculator is a medical tool designed to help assess the likelihood of an adrenal adenoma by calculating hormone washout rates from blood test results. It processes specific laboratory data points, requiring inputs such as plasma cortisol concentrations and related measurements to estimate how quickly excess hormones may be eliminated from the bloodstream. The calculation provides a quantifiable assessment used by clinicians when interpreting complex endocrine test results. The Omni Calculator version presents a clean, structured interface that guides users through three specific scan time points: pre-contrast, 60-75 seconds post-contrast, and a delayed 15-minute scan. It clearly defines two key metrics: absolute washout (where a result higher than 60% strongly suggests adenoma) and relative washout (where a result higher than 40% strongly suggests adenoma). The tool also includes educational context explaining that adenomas, both lipid-rich and lipid-poor, rapidly wash out contrast, while non-adenomas generally enhance quickly but take longer to wash out. A share function allows users to export results, though the site includes a standard medical disclaimer emphasizing that the tool cannot replace professional doctor assessment.
How to use the Omni Calculator Adrenal Washout Calculator
- 1
Select the pre-contrast Hounsfield Unit value from your imaging scan
- 2
Enter the 60-75 second post-contrast Hounsfield Unit value
- 3
Input the 15-minute delayed Hounsfield Unit value
- 4
View the calculated absolute and relative washout percentages
- 5
Review the results indicating whether the pattern suggests adrenal adenoma or non-adenoma
Best for
Healthcare professionals and students evaluating adrenal mass characterization who need a quick, formula-based assessment to help distinguish between adenomas and non-adenomas based on washout kinetics.
Limitations
- Results are estimates and cannot replace clinical judgment or final diagnosis
- Requires specific Hounsfield Unit measurements from CT imaging
- Not suitable for patients without prior adrenal imaging studies
Adrenal Washout Calculator FAQ
- What washout percentage indicates an adrenal adenoma?
- An absolute washout higher than 60% or a relative washout higher than 40% is strongly suggestive of an adrenal adenoma, according to the calculator's diagnostic criteria.
- Can this calculator diagnose adrenal tumors on its own?
- No, the tool provides a quantitative assessment to aid interpretation but cannot replace a professional doctor's assessment or final diagnosis.
- What three scan time points are needed for the calculation?
- The calculator requires a non-contrast scan, a contrast-enhanced scan at 60-75 seconds, and a delayed scan at 15 minutes post-contrast.
- How do adenomas differ from non-adenomas in washout patterns?
- Adenomas, both lipid-rich and lipid-poor, rapidly wash out contrast, whereas non-adenomas such as metastases generally enhance quickly but take longer to wash out, allowing differentiation based on washout kinetics.
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