Virginia HESI Level 4 Practice Test

Tracking tissue perfusion during sepsis therapy is best done by monitoring serum lactate levels. When tissues aren’t getting enough oxygen, cells switch to anaerobic metabolism and produce more lactate. In septic patients, high lactate indicates ongoing hypoperfusion at the microcirculatory level. As resuscitation improves blood flow and oxygen delivery, lactate tends to decrease—a sign that perfusion is improving. So serial lactate measurements give you dynamic, real-time feedback on how well perfusion is responding to therapy and help guide treatment decisions. In contrast, a single blood glucose value can rise with stress and treatment but doesn’t directly reflect perfusion status. Platelet count shows coagulation and inflammatory processes rather than blood flow to tissues. Serum creatinine indicates kidney function, which can worsen with poor perfusion but changes more slowly and doesn’t provide immediate feedback on perfusion during acute resuscitation.