Fisher Grade (SAH Blood Volume)

Classify subarachnoid hemorrhage blood volume on CT using the Fisher grade to predict vasospasm risk.

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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

Classify subarachnoid hemorrhage blood volume on CT using the Fisher grade to predict vasospasm risk

Each component has a specific meaning:

  • Fisher grade — The fisher grade recorded for the scenario being assessed.

Note: Interpret the fisher grade result against the thresholds and context described above.

How to Use

Enter the Fisher grade for the scenario you are assessing. Classify subarachnoid hemorrhage blood volume on CT using the Fisher grade to predict vasospasm risk. Use the fisher grade result to inform your calculation.

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Frequently Asked Questions