Calculator Form
Example Data Table
| Case | Diameter | Height | Weight | BSA Method | Approx ASI | Educational Flag |
|---|---|---|---|---|---|---|
| Example A | 3.8 cm | 170 cm | 70 kg | Mosteller | 2.12 cm/m² | Lower indexed flag |
| Example B | 4.8 cm | 160 cm | 60 kg | Mosteller | 2.94 cm/m² | Moderate indexed flag |
| Example C | 6.2 cm | 180 cm | 82 kg | Mosteller | 3.11 cm/m² | Moderate indexed flag |
Formula Used
Aortic Size Index: ASI = aortic diameter in cm ÷ body surface area in m².
Mosteller BSA: BSA = square root of ((height in cm × weight in kg) ÷ 3600).
Du Bois BSA: BSA = 0.007184 × height0.725 × weight0.425.
Haycock BSA: BSA = 0.024265 × height0.3964 × weight0.5378.
Height Index: aortic diameter in cm ÷ height in meters.
Area Height Ratio: cross-sectional area in cm² ÷ height in meters.
How to Use This Calculator
- Enter the measured aortic diameter from the imaging report.
- Select the correct diameter unit.
- Choose the measured aortic site.
- Enter height and weight with matching units.
- Select a BSA formula. Mosteller is simple and common.
- Add age, sex, context, and notes if useful.
- Press calculate to show results above the form.
- Use CSV or PDF buttons to save the summary.
Article: Aortic Size Index Calculator Guide
Purpose
The aortic size index calculator helps compare a measured aortic diameter with body size. A larger person may naturally have a larger vessel. A smaller person may reach concern at a smaller absolute diameter. Indexing tries to make the number more personal. It supports careful review, not diagnosis.
Why Body Size Matters
The aorta is the main artery leaving the heart. Its size is often measured by echocardiography, CT, or MRI. Reports may show the aortic root, ascending aorta, arch, descending aorta, or abdominal aorta. A single diameter can be useful. Yet body surface area adds context. This is why ASI is often reviewed with the original scan result.
Main Output
The main output is ASI in cm per square meter. The calculator first converts all units. It then estimates body surface area. Next, it divides diameter by BSA. The result can be compared with simple educational bands. These bands are screening labels only. They cannot replace clinical judgment, image quality review, or specialist guidance.
Advanced Values
The tool also calculates a height indexed value. This divides aortic diameter by height in meters. It also calculates cross-sectional area. That value is divided by height. These extra numbers can help users discuss reports more clearly. They are not universal treatment rules.
Inputs
Accurate inputs are important. Use the maximum diameter from the official report. Choose centimeters, millimeters, or inches correctly. Enter height and weight carefully. Select the same site described by the report. Add the imaging context when known. Different methods can measure different edges of the vessel.
Safe Interpretation
A result marked higher should not cause panic. It means the measurement deserves proper review. Symptoms, family history, valve disease, genetic conditions, growth rate, and scan method all matter. A clinician may compare earlier scans. They may also repeat imaging. Use this calculator as a structured note before a professional conversation.
FAQs
1. What is aortic size index?
It is the measured aortic diameter divided by body surface area. It helps compare aortic size across people with different body sizes.
2. Is this calculator a diagnosis tool?
No. It is an educational calculator. A clinician must interpret imaging, symptoms, history, and follow-up needs.
3. Which diameter should I enter?
Use the maximum aortic diameter from the imaging report. Match the site, unit, and measurement method when possible.
4. Which BSA formula should I choose?
Mosteller is widely used because it is simple. Du Bois and Haycock are included for comparison and advanced review.
5. Why does height indexing appear?
Height indexing gives another body-size adjustment. Some clinicians compare diameter with height, especially when weight may distort BSA.
6. Can I use inches and pounds?
Yes. The calculator converts inches to centimeters and pounds to kilograms before applying the formulas.
7. What does a review flag mean?
A review flag means the result deserves medical discussion. It does not confirm aneurysm, dissection risk, or treatment need.
8. Can I save the results?
Yes. Use the CSV button for spreadsheet records. Use the PDF button for a readable summary.