Lactate is a vital marker in critical care, but its meaning is complex, reflecting an interplay of perfusion, metabolism, organ function, and stress. Clinicians must adopt a nuanced, multimodal approach to interpretation, recognizing that tracking lactate dynamics provides valuable diagnostic and prognostic information, but over-treating based on a high lactate level alone must be avoided.

Beyond Hypoxia: Clinicians must be aware of non-hypoxic causes of elevated lactate (e.g., related to metabolism or drugs), as lactate elevation doesn’t always signal poor tissue oxygenation.

The Multimodal Approach: Lactate should be used alongside other clinical indicators.

Capillary Refill Time (CRT): Trials like ANDROMEDA-SHOCK suggest that targeting CRT may be as effective as, or even better than, a lactate-guided strategy for resuscitation in septic shock. CRT is less influenced by factors like liver function or adrenaline.

Advanced Hemodynamics: The combination of the venoarterial PCO2 gap and the C(av)O2 ratio can help distinguish between hyperlactatemia caused by actual tissue hypoxia and that caused by non-hypoxic mechanisms.

Integrated Value: Even though the primary outcome of ANDROMEDA-SHOCK was negative for a strict lactate-guided approach, subsequent analyses suggest lactate still offers prognostic information and potential benefit when it’s integrated into a comprehensive patient assessment.

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