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A retrospective analysis of 235 consecutive patients over 70\u00a0years old, who underwent HF surgery, was conducted. The FI-Lab, based on 21 routine blood parameters, was evaluated using Receiver Operating Characteristics, Area Under the Curve (AUC), Kaplan\u2013Meier curves, and Cox proportional Hazard ratios. The FI-Lab showed an AUC of 0.7177 for 6-month and 0.7423 for 1-year survival. High FI-Lab values correlated with higher preoperative ASA scores, longer time-to-surgery times, more perioperative transfusions, and higher postoperative complication rates. The Cox hazard ratio revealed a significant increase in the risk of death for 1\u00a0year and 6\u00a0months from a score of 0.4 and higher. 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