Sepsis: Early Recognition and the First Hour

Medical-Surgical · Immune & Infectious Disease·Updated 2026-10-28

What it is

Sepsis is life-threatening organ dysfunction caused by a dysregulated host response to infection. Inflammatory mediators dilate blood vessels, make capillaries leak and form microthrombi, so circulating volume falls and tissues switch to anaerobic metabolism, raising lactate. Septic shock is sepsis in which vasopressors are needed to keep the mean arterial pressure (MAP) at 65 mm Hg or higher and lactate stays above 2 mmol/L despite adequate fluid resuscitation. Every early action (cultures, antibiotics, crystalloid, vasopressors) restores perfusion or removes the source.

What the NCLEX focuses on

Early cues: temperature above 100.4 F (38 C) or below 96.8 F (36 C), heart rate above 90/min, respiratory rate above 20/min, new confusion, mottled skin and falling urine output.
Older adults and immunosuppressed clients often show confusion, falls or hypothermia instead of fever; a normal temperature does not rule out sepsis.
Lactate above 2 mmol/L signals hypoperfusion; lactate of 4 mmol/L or higher, or hypotension, calls for a 30 mL/kg crystalloid bolus.
Two sets of blood cultures are drawn before antibiotics only when this causes no meaningful delay; antibiotics start within 1 hour.
Norepinephrine is the first-line vasopressor; check the infusion site often for extravasation.
New crackles, a rising respiratory rate or falling SpO2 during boluses signal fluid overload; reassess after each bolus.
Insulin is started when blood glucose is 180 mg/dL (10 mmol/L) or higher; the target is 144 to 180 mg/dL (8 to 10 mmol/L).

Priority nursing actions

Recognize the cues, report them and activate the sepsis protocol or rapid response team.
Draw a serum lactate and two sets of blood cultures from different sites.
Give the prescribed broad-spectrum antibiotics within 1 hour of recognition.
Infuse 30 mL/kg of isotonic crystalloid (balanced solution or 0.9% sodium chloride) within the first 3 hours for hypotension or lactate of 4 mmol/L or higher.
Start the prescribed norepinephrine if the MAP stays below 65 mm Hg after fluids.
Monitor MAP, heart rate, mental status and hourly urine output, and repeat the lactate if the first value was elevated.

Numbers to know

Value	Normal or target	Why it matters
Temperature	96.8 to 100.4 F (36 to 38 C)	Values outside this range are a sepsis cue
Lactate	Below 2 mmol/L (18 mg/dL)	4 mmol/L (36 mg/dL) or higher calls for a 30 mL/kg fluid bolus
MAP	65 mm Hg or higher	Minimum pressure for organ perfusion
Urine output	At least 0.5 mL/kg/hr	Lower output signals poor renal perfusion
WBC	4,000 to 11,000/mm3 (4 to 11 x 10^9/L)	Above 12,000 or below 4,000/mm3, or more than 10% bands, supports sepsis
Antibiotics	Within 1 hour of recognition	Each hour of delay raises mortality

Common exam traps

Choosing to wait for a fever before reporting a newly confused older adult with a urinary tract infection: wrong because older adults often present with confusion and low urine output without fever.
Choosing to hold antibiotics until culture results return: wrong because results take 24 to 48 hours; cultures are drawn first only when that causes no meaningful delay.
Choosing a normal blood pressure as reassurance: wrong because tachycardia, confusion and a rising lactate show hypoperfusion before hypotension.
Choosing 5% dextrose in water for the fluid bolus: wrong because it acts as free water once the dextrose is metabolized and leaves the vascular space.
Choosing fluid restriction or a loop diuretic for a hypotensive septic client: wrong because vasodilation and capillary leak cause relative hypovolemia that needs volume.

What to teach

Take the full antibiotic course even after feeling better.
Seek emergency care for signs of infection with confusion, fast breathing, shaking chills, mottled or very cold skin, or little urine.
Prevent infection with hand hygiene, wound and catheter care, and influenza and pneumococcal vaccines.

Try 2 NCLEX-style questions on this topic

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Question 1 · QID 71256900

An 82-year-old client with a urinary tract infection develops new confusion and decreased urine output but no fever. For each interpretation, indicate whether it is accurate or inaccurate.

For each interpretation of these findings, indicate whether it is accurate or inaccurate.

	Accurate	Inaccurate
The absence of fever means infection is not the underlying cause
These findings are simply expected signs of aging with no clinical significance
Sepsis can be ruled out because no fever is present
These findings may represent early sepsis, since older adults may not mount a significant fever

Question 2 · QID 7722666B

A nurse is preparing to start broad-spectrum antibiotics for a client with recognized sepsis. Blood cultures have not yet been drawn. Which action is most appropriate?

Select the best answer.

A. Start the broad-spectrum antibiotics immediately and obtain blood cultures after the first dose has finished infusing
B. Draw the blood cultures first, without meaningfully delaying the antibiotics
C. Start antibiotics first when sepsis is recognized, then obtain cultures during the next scheduled laboratory collection
D. Wait until blood cultures are collected, labeled, transported, and accepted by the laboratory before beginning the antibiotic infusion

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Sources

Harding MM, Kwong J, Hagler D, Reinisch C. Lewis's Medical-Surgical Nursing: Assessment and Management of Clinical Problems. 12th ed. Elsevier; 2023; Chapter: Shock, Sepsis, and Multiple Organ Dysfunction Syndrome.
Evans L, Rhodes A, Alhazzani W, et al. Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021. Crit Care Med. 2021;49(11):e1063-e1143.
Singer M, Deutschman CS, Seymour CW, et al. The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA. 2016;315(8):801-810.

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