A sepsis patient admitted in ICU. Which laboratory value is abnormal?

NORCET 8 Prelims-2025

Medical Surgical Nursing

Medium

Appeared in: NORCET 8 Prelims-2025

Explanation

Lactate is a product of anaerobic metabolism, and its elevation is a key marker of tissue hypoperfusion (inadequate oxygen delivery to cells).
According to the Sepsis-3 guidelines, a serum lactate level greater than 2 mmol/L is a critical indicator and part of the definition for septic shock.
A value of 5.5 mmol/L is significantly elevated, indicating severe metabolic stress, organ dysfunction, and a high risk of mortality.
This finding necessitates immediate intervention to restore perfusion and oxygenation.

Option A: A White Blood Cell (WBC) count of 9,000 cells/mm³ is within the normal physiological range of 5,000-10,000 cells/mm³.
Option B: A Random Blood Sugar (RBS) of 110 mg/dL is a normal finding. The typical normal range for a non-fasting blood glucose is under 140 mg/dL.
Option C: A urine output of 1.5 mL/minute calculates to 90 mL/hour, which indicates adequate renal perfusion. The threshold for oliguria (a sign of acute kidney injury) is less than 0.5 mL/kg/hr.

Visual 1: Infographic: A flowchart illustrating the progression from Systemic Inflammatory Response Syndrome (SIRS) to sepsis, severe sepsis, and septic shock, highlighting the key diagnostic criteria at each stage, including lactate levels.
Visual 2: Table: A summary of the SOFA (Sequential Organ Failure Assessment) score, showing how different organ systems (respiratory, coagulation, liver, cardiovascular, CNS, renal) are scored to determine the severity of organ dysfunction in sepsis.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Interpretation of laboratory values in sepsis in acute care settings.
For a nurse in the ICU, recognizing an elevated lactate level is a critical responsibility. It is a 'red flag' that signals the patient is deteriorating and requires immediate escalation to the medical team and rapid implementation of the sepsis management bundle (e.g., Sepsis Six).
Monitoring trends in lactate is crucial. A rising lactate indicates worsening perfusion and failing interventions, while a falling lactate (lactate clearance) is a key indicator of successful resuscitation.
What if? If the patient's lactate was 2.5 mmol/L, it is still an abnormal and concerning finding that requires action. While not as critically high as 5.5 mmol/L, it meets the criteria for hyperlactatemia in sepsis and warrants aggressive fluid resuscitation and investigation to prevent progression to more severe shock.

How to Approach the Question

First, identify the question's core task: to find the one ABNORMAL value among the options for a patient with a specific condition (sepsis).
Second, systematically evaluate each option by comparing the given value to its standard normal range in an adult.
For Option A (WBC), recall the normal range is 5,000-10,000/mm³. 9,000 is normal.
For Option B (RBS), recall that a random glucose under 140 mg/dL is normal. 110 mg/dL is normal.
For Option C (Urine Output), convert the units from mL/min to mL/hr (1.5 x 60 = 90 mL/hr). Compare this to the critical threshold for oliguria (<0.5 mL/kg/hr, or ~30-40 mL/hr). 90 mL/hr is normal.
For Option D (Lactate), recall that normal lactate is <2 mmol/L. A value of 5.5 mmol/L is clearly and significantly abnormal, making it the correct answer.

Concept Tested & Keywords

Concept Tested: Interpretation of laboratory values in sepsis
Stem keywords: sepsis, ICU, laboratory value, abnormal
Lead-in keywords: Which
Clinical cues: Patient with sepsis in the ICU, which implies a critically ill state requiring close monitoring of organ function.

QCP6jtTx59Pod_8sjD8Kl4