How to recognize sepsis early and what the nurse does first
NCLEX-RN topic: Medical emergencies
- Sepsis is a body-wide overreaction to an infection.
- Septic shock: blood pressure stays low despite IV fluids.
- Cues: temperature over 38°C or under 36°C, pulse over 90/min, breathing over 20/min.
- Draw blood cultures, then give the antibiotic right away.
- Fluids first; norepinephrine if MAP stays below 65 mm Hg.
Key facts
- Inflammatory-response cues: temperature over 38°C (100.4°F) or under 36°C (96.8°F), heart rate over 90/min, respiratory rate over 20/min, WBC over 12,000 or under 4,000/mm³.
- Septic shock is low blood pressure that does not respond to adequate IV fluids; the usual treatment target is a mean arterial pressure (MAP) of 65 mm Hg or higher.
- A lactate above 2 mmol/L (normal less than 2 mmol/L) signals anaerobic metabolism from poor perfusion; above 4 mmol/L carries high mortality.
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- Blood cultures are drawn before the first dose of a broad-spectrum antibiotic, and the antibiotic is then given without delay.
- IV fluids come first for hypotension; norepinephrine is the first-line vasopressor if blood pressure stays low after fluids.
- Urine output under 30 mL/hour means poor kidney perfusion and must be reported.
- In older adults, a new change in mental status is often one of the first signs of sepsis.
Quick check1 question · 2 more at the end
A client with a urinary tract infection has a temperature of 38.9°C (102°F), a heart rate of 116/min, and a blood pressure of 98/60 mm Hg. The provider prescribes blood cultures, a broad-spectrum IV antibiotic, a lactate level, and an IV crystalloid bolus. The bolus is already infusing. Which action should the nurse take next?
Correct answer: B.
In suspected sepsis, blood cultures are obtained before broad-spectrum antibiotics so the organism can be identified and the antibiotic adjusted to it later, and the first antibiotic dose is then given immediately because each hour of delay raises mortality. Culture results take 1 to 3 days, so waiting for them is unsafe. Fluids come before vasopressors.
A Cultures are drawn before the first dose so the organism can still be identified; giving the antibiotic first reverses the required order.
B Correct: cultures before the antibiotic, then the antibiotic right away, follows the time-sensitive sepsis bundle.
C Blood cultures take 1 to 3 days; delaying the antibiotic that long increases the risk of death.
D IV fluids are given first for hypotension in sepsis; a vasopressor such as norepinephrine is added if pressure stays low after fluids.
Full lesson
Each part starts with its main idea. Open a part when you want the details.
The short answer: Sepsis is an exaggerated, body-wide inflammatory response to an infection, and septic shock is sepsis with low blood pressure that persists despite IV fluids. Early cues are fever or low temperature, fast heart and breathing rates, abnormal WBC, new confusion and low urine output. The nurse alerts the provider, draws blood cultures before antibiotics, and starts fluids promptly.
1 What is sepsis, and how does it become septic shock?Sepsis is the body's extreme, body-wide reaction to an infection, and it is a medical emergency. 1 min
Sepsis is the body's extreme, body-wide reaction to an infection, and it is a medical emergency. The infection itself starts somewhere local, most often in the lungs, urinary tract, gastrointestinal tract or skin. The danger comes from the runaway inflammatory response that follows.
That response is called systemic inflammatory response syndrome (SIRS). When an infection causes it, the client has sepsis. If sepsis starts damaging organs such as the kidneys, it can progress to septic shock. In septic shock, blood pressure stays low even after adequate IV fluids, and cells stop getting enough oxygen.
Anyone with an infection can develop sepsis. Risk is higher in adults over 65, infants under 1 year and people who are immunocompromised. It is also higher in people with diabetes, lung, kidney or cancer diagnoses, and in people with indwelling lines or urinary catheters.
2 Which early cues should make you think of sepsis?Sepsis cues are vital-sign and lab changes in a client who has, or might have, an infection. 1 min
Sepsis cues are vital-sign and lab changes in a client who has, or might have, an infection. No single number makes the diagnosis, so look for the cluster.
| Cue | Threshold to act on | What it tells you |
|---|---|---|
| Temperature | Over 38°C (100.4°F) or under 36°C (96.8°F) | Inflammatory response |
| Heart rate | Over 90/min | Inflammation, then compensation for low pressure |
| Respiratory rate | Over 20/min | Inflammation and rising acid load |
| WBC (4,500–11,000/mm³) | Over 12,000 or under 4,000/mm³ | Immune response to infection |
| Lactate (less than 2 mmol/L) | Over 2 mmol/L | Cells switching to anaerobic metabolism |
| Urine output | Under 30 mL/hour | Poor kidney perfusion |
| Mental status | Any new confusion or agitation | Poor brain perfusion |
Clients may also report chills, shortness of breath, severe pain, or clammy, sweaty skin. In older adults, a new change in mental status is often one of the first signs.
3 How does septic shock change as it worsens?Septic shock moves from a "warm" phase to a "cold" phase as the body's compensation fails. 1 min
Septic shock moves from a "warm" phase to a "cold" phase as the body's compensation fails. Recognizing the warm phase buys time.
- Early (warm) shock: skin warm and flushed, bounding pulses, tachycardia, fast breathing. Cardiac output is high and blood vessels are dilated.
- Late (cold) shock: cardiac output falls and vessels clamp down. Skin turns cool, mottled or purplish; pulses weaken; urine output drops toward none.
- Throughout: lactate rises and metabolic acidosis develops. Respiratory rate climbs early, then falls as the client tires and decompensates.
Shock caught in the compensatory stage can still be reversed if the cause is treated. Once organ damage becomes irreversible, recovery is unlikely.
4 What the nurse doesThe nurse's job is to recognize sepsis fast, escalate, and start the time-sensitive treatments. 1 min
The nurse's job is to recognize sepsis fast, escalate, and start the time-sensitive treatments. Each hour of delayed treatment raises mortality.
- Assess and escalate. Check vital signs, mental status and urine output. Alert the provider right away and follow the facility's sepsis protocol.
- Draw labs. Obtain a lactate level and blood cultures. Cultures come before the first antibiotic dose so the organism can be identified and the antibiotic adjusted to it later.
- Give the antibiotic. Hang the broad-spectrum antibiotic immediately after the cultures are drawn. Do not wait 1–3 days for culture results.
- Restore volume. Infuse the prescribed IV crystalloid. If blood pressure stays low after fluids, expect norepinephrine first, with a goal MAP of 65 mm Hg or higher.
- Monitor and reassess. Measure urine output hourly (goal at least 30 mL/hour), repeat the lactate, and watch mental status and skin. Report worsening right away.
Teaching point for clients and families: sepsis can follow any infection, so a worsening infection with confusion, fast breathing or a racing heart needs emergency care.
Common mistakes
The traps students fall into most. Read these before you practice.
Watch out: Draw blood cultures first and then give the antibiotic right away, not wait for culture results before starting it.
Watch out: Fluids before vasopressors, not a vasopressor as the first fix for low blood pressure in sepsis.
Watch out: A low temperature can be a sepsis cue too, not only a fever.
Watch out: New confusion in an older adult is a possible early sepsis sign, not just expected aging.
Watch out: Early (warm) septic shock can look flushed with bounding pulses, not always cold and clammy.
How to remember it
Memory hook: "Hot or cold, fast and confused." Temperature can go either way, but heart rate and breathing go fast, and the brain goes foggy. Then remember the order of care as "Cultures, Antibiotic, Fluids, Pressor" (CAFP: "cultures always first, pressors last").
Self-check:
- Name four cues from the table and the threshold for each.
- Explain why blood cultures are drawn before the antibiotic, and why the antibiotic is still given right away.
- A client stays at a MAP of 58 mm Hg after IV fluids. Say what this means and what drug you expect next.