Cardiac Index Calculator
Don't know your Body Surface Area?
Cardiac Index Normal Range Chart
| Cardiac Index (L/min/m²) | Interpretation |
|---|---|
| Below 2.2 | Low cardiac output |
| 2.2 – 4.0 | Normal cardiac index |
| Above 4.0 | High cardiac output |
How to Measure Cardiac Output & Body Surface Area
Cardiac Output (CO) is the amount of blood the heart pumps per minute.
Body Surface Area (BSA) represents the total surface area of the human body. We use the Mosteller formula: $\text{BSA} = \sqrt{\frac{\text{Height(cm)} \times \text{Weight(kg)}}{3600}}$
How Cardiac Index Is Calculated
Cardiac Index is calculated using the formula: Cardiac Output ÷ Body Surface Area (BSA).
Because body size affects cardiac output, indexing it to BSA provides a more accurate assessment of heart function.
Normal Cardiac Index Range
A normal cardiac index typically ranges between 2.5 and 4.0 L/min/m². Values below or above this range may indicate cardiovascular concerns.
Why Cardiac Index Matters
Cardiac Index is commonly used in clinical settings to evaluate heart performance, fluid status, and response to treatment. It is especially important for patients with heart conditions.
Use Cardiac Index as a Screening Tool
Cardiac Index is a screening tool and should not be used alone to diagnose medical conditions. Always consult a healthcare provider for medical advice.