Sepsis
A life-threatening emergency in which the body's response to an infection injures its own tissues and organs. It can develop from any infection and progresses fast, so recognising the warning signs and getting emergency treatment quickly saves lives.
What it is
Sepsis is the body's extreme, dysregulated response to an infection: instead of staying local, the immune reaction spills over and starts to damage the body's own tissues and organs. It can arise from any infection — a chest, urine, abdominal or skin infection are common starting points — and it is a medical emergency because it can progress within hours to organ dysfunction, a dangerous drop in blood pressure (septic shock) and death. Anyone can develop sepsis, but the very young, older people, those with weakened immunity, and people with serious illness or recent surgery are at higher risk. Because outcomes depend heavily on speed, the priority is recognition and rapid treatment: urgent antibiotics, fluids and support, often summarised as the 'Sepsis Six'. Blood tests help — a raised or very low white cell count, high CRP and procalcitonin, and especially a raised lactate (a marker of tissues not getting enough oxygen) indicate severity — but treatment is started on suspicion, not delayed for results. The key message is simple: sepsis is time-critical, so acting fast on the warning signs matters more than anything.
Key lab markers
- Lactate — a key severity marker; a high level signals tissues struggling and worse outcomes.
- White cell count (WBC) — often high, but can be very low in severe sepsis.
- CRP and procalcitonin — raised with bacterial infection; procalcitonin especially.
- Blood cultures — taken before antibiotics to identify the organism.
- Kidney and liver function, clotting, platelets — assess organ involvement. Tests guide and monitor, but treatment is not delayed waiting for them — sepsis is treated on clinical suspicion.
Symptoms
- Feeling extremely unwell, or a marked deterioration during an infection
- A very high or very low temperature; shivering
- A fast heartbeat and fast breathing
- Confusion, disorientation, or slurred speech
- Not passing urine as usual
- Cold, clammy, pale or mottled skin
- In children: a rash that doesn't fade under pressure, difficulty breathing, a weak or high-pitched cry, floppiness
- A feeling that something is seriously wrong
Related symptoms
Related lab panels
When to discuss with a doctor
Sepsis is a medical emergency — if you suspect it, seek emergency help immediately, because every hour of delay worsens the outcome. Warning signs that should prompt urgent care, especially during or after an infection, include: acting confused, slurred speech or disorientation; extreme shivering or muscle pain; passing no urine in a day; severe breathlessness; skin that is mottled, pale or blue; and a feeling of being more unwell than ever before. In children, additional red flags include a non-fading rash, difficulty breathing, a weak or high-pitched cry, and unusual floppiness. Do not wait to see if it improves. Mediora.AI can flag a raised lactate, procalcitonin and abnormal white-cell pattern that fit severe infection, but sepsis is a clinical emergency treated urgently — the warning signs, not a blood test, are what should drive immediate action.