Q: What does SQI means on bedside monitor while collecting hemodynamic monitoring data? 

Answer: Signal Quality Indicator 

Signal Quality Indicator as name indicates signifies the quality of electrical signal of transducers while calibrating Pulmonary Artery Catheter, particularly for SVO2 (Mixed Venous Oxygen saturation.  SQI runs from number one to number four (SQI1, SQI2, SQI3, SQI4), been SQI1 most reliable.

Calibration should not be relied on if SQI is equal to or greater than three. Some experts even take SQI2 as questionable.