Oxygen Saturation Index

Tiny Taught · NICU calculator

Oxygen Saturation Index

Estimate oxygenation using pulse oximetry in ventilated neonates.

Enter 21–100%. For FiO₂ 0.60, enter 60.

Your result

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Oxygen Saturation Index / OSI

Enter all three values, then calculate.

The formula

OSI = (FiO₂% × MAP) / SpO₂%

Equivalent to (FiO₂ fraction × MAP × 100) / SpO₂%.

OSI can help assess hypoxic respiratory failure when arterial PaO₂ is unavailable. It is less informative when SpO₂ is above 97%. Interpret it with the clinical picture and trends.

For education and clinical support. Clinical judgment and local protocols prevail. Values stay in your browser. Formula reference.

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