In early sepsis management, which biomarker is commonly measured to assess tissue perfusion?

• A. Lactate level
• B. Hemoglobin
• C. Vitamin D level
• D. Troponin I

Answer: (A)

Measuring tissue perfusion in the early stages of sepsis relies on a marker that directly reflects how well oxygen is being delivered and used by tissues. Lactate fits this role because it accumulates when cells switch to anaerobic metabolism due to inadequate oxygen delivery or utilization. Elevated lactate signals that perfusion is insufficient, and tracking lactate levels over time (lactate clearance) helps gauge how well resuscitation is restoring adequate perfusion.

In contrast, hemoglobin indicates the blood’s capacity to carry oxygen, not how well tissues are currently perfusing; vitamin D level isn’t related to acute perfusion status; troponin I reflects heart muscle injury rather than global tissue perfusion.