Sepsis and acute infection assessment (Assessment of suspected sepsis and acute infection)

What is a sepsis and acute infection assessment?

Sepsis is a medical emergency. If you or another adult with an infection has any red flag — slurred speech or confusion, extreme shivering or muscle pain, passing no urine in a day, severe breathlessness, mottled or discoloured skin, or a feeling that you are going to die — call 999 or go to A&E now and ask: 'Could it be sepsis?' For a child who is breathing very fast, has a fit, looks mottled, bluish or pale, has a rash that does not fade when pressed, is very lethargic or hard to wake, or feels abnormally cold, call 999. Do not wait to book a private appointment.

A sepsis and acute infection assessment is for people who are unwell with an infection but stable enough to be assessed — without the red flags above. It finds where the infection is, how severe it is, and whether it is tipping towards sepsis (when the body's response to infection starts to harm its own organs).

The assessment is usually done by an acute physician or a general physician. They take your story, examine you, measure your observations (temperature, pulse, breathing rate, blood pressure and oxygen), and take blood tests, often including blood cultures, plus urine and other samples to find the source. Doctors follow a national NICE assessment pathway matched to your age, with a separate pathway used in pregnancy or recent pregnancy. The treatment you need depends on how high your risk is judged to be — it is not a single fixed set of steps that is identical for everyone.

Be clear about the limits. The assessment is good at spotting people who are seriously unwell and at starting treatment quickly, but the exact bug is not always known straight away — some tests, such as blood cultures, take a day or more. Treatment is often started before the results are back.

Types, options & approaches

There may be different ways to do this. The right approach depends on the clinical question and your circumstances.

999 / A&E vs NHS 111 / GP vs private assessment for infection

Sepsis can develop quickly. If you are unsure, ask 'Could it be sepsis?' and escalate if red flags appear. For urgent non-emergency advice, use NHS 111 in England, Scotland or Wales, or GP out-of-hours / your HSC Trust's Phone First service in Northern Ireland.

Preparing for your test

• First, check for red flags: confusion, extreme shivering, passing no urine, severe breathlessness or mottled skin in an adult, or the child signs above, mean call 999 now — not book an appointment.
• If you are stable, note when you became unwell, your symptoms, and your highest recorded temperature if you have measured it.
• Try to identify the likely source: cough and phlegm, burning or frequent urine, a red or painful wound or skin area, tummy pain or diarrhoea.
• Bring a full list of your medicines, especially any that weaken the immune system (such as steroids or chemotherapy) and any recent antibiotics.
• Mention recent travel, animal or insect bites, recent surgery, catheters or lines, and any long-term conditions such as diabetes.
• Tell the clinician if you have a weakened immune system, no spleen, or are pregnant, as these raise the risk from infection.
• Bring someone with you if you can, and arrange transport, as you may need to stay for tests or be admitted.

What happens

The clinician first measures your observations — temperature, pulse, breathing rate, blood pressure and oxygen — and combines them into an early warning score to judge how unwell you are. If you have red flags or a high score, you move straight to urgent treatment rather than a routine work-up.

If you are stable, they take a detailed history and examine you to find the source of infection. You will usually have blood tests, often including blood cultures, plus a urine test and any samples relevant to the likely source, such as a wound swab.

Depending on the picture, you may have a chest X-ray or a scan to look for a hidden source such as an abscess. Doctors assess you using the NICE pathway for your age, with a separate pathway in pregnancy or recent pregnancy. If you are judged to be at high risk, you need urgent senior review and antibiotics into a vein within one hour, started before the exact bug is known, because acting early saves lives. Oxygen, intravenous fluid, blood tests, cultures and closer monitoring are used when they are clinically needed — the exact combination is not identical for every patient, and not everyone with a suspected infection needs fluids.

Before you leave, you should be told the likely source, how unwell you are, what treatment you need, when culture results will be back, and exactly what to do if you get worse.

Is this test right for me?

A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.

Before you decide

Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.

Sepsis can develop quickly, and the biggest danger is not recognising it or delaying emergency care. The exact bug is often unknown at first, so antibiotics are usually started on best judgement and then adjusted when cultures come back. Antibiotics carry their own risks, including side effects and resistance, so they should be targeted once the cause is clearer. Ask where the infection is thought to be, how unwell you are, and exactly which warning signs mean you should call 999.

Published figures to discuss

There is no single reliable figure for how often an infection becomes sepsis, because it depends on the bug, the source, age and underlying health. The exact cause is often unknown at first, since blood cultures take time and can be negative even in real infection. The value of the assessment is in spotting serious illness early and starting treatment quickly, not in a fixed success rate. Antibiotics are started on best judgement and refined as results return.

These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.

What happens afterwards

After the assessment, recovery depends on the infection and how unwell you are. What matters is taking the right treatment, being monitored if needed, and knowing the red flags that mean you should seek emergency help again.

• Feeling tired and washed out for a while, even after a mild infection
• A temperature that settles over a day or two once treatment starts
• Mild bruising where blood was taken
• Waiting a day or more for culture results, with antibiotics started in the meantime

Aftercare

• Take antibiotics or other treatment exactly as prescribed, and complete the full course unless told to stop.
• Rest, drink plenty of fluids unless told otherwise, and monitor your temperature if advised.
• Follow up on any culture results that were still pending, as treatment may need adjusting.
• Watch closely for the red flags of sepsis and do not hesitate to call 999 if they appear.
• Look after the source of infection — for example wound care, or finishing treatment for a urine or chest infection.
• Make sure you know who to contact, and how, if you get worse before your next review.
• Tell your GP if you do not improve as expected, or if symptoms return after finishing treatment.

• A note of when you became unwell and your symptoms
• Your highest recorded temperature if you have measured it
• A full list of your medicines, including any that weaken the immune system
• Details of recent travel, bites, surgery, catheters or lines
• Whether you have a weakened immune system, no spleen, or are pregnant
• Someone to come with you and arrange transport
• Questions written down and a way to record your result and plan

⚠ Get urgent help if…

• Slurred speech or new confusion — call 999 and ask 'Could it be sepsis?'
• Extreme shivering or severe muscle pain — call 999
• Passing no urine in a day — call 999
• Severe breathlessness — call 999
• Skin that is mottled, discoloured, very pale or bluish — call 999
• A feeling that you are going to die, or a rapid decline — call 999
• In a child: very fast breathing, a fit, a rash that does not fade when pressed, very drowsy or hard to wake, or abnormally cold — call 999
• A high temperature or feeling increasingly unwell despite treatment — seek urgent advice

Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.

General guidance — it doesn't replace the specific advice your specialist gives you.

Results & realistic expectations

A good result is a clear idea of where the infection is, how severe it is, and a treatment plan that fits — together with safe monitoring or admission if you need it. For many people the infection is mild and can be treated at home with simple measures or a short course of treatment.

The limits matter. The exact bug is often not known at first, because blood cultures take a day or more to grow, and some sources are hard to find. Treatment is therefore based on best judgement and adjusted later. Early blood tests can be normal even when an infection is developing, so observations are repeated and you are given clear advice about the red flags of sepsis.

The result reflects this episode of infection. It does not protect you from future infections, and a new illness needs assessing on its own merits. If you have a long-term condition or weakened immune system, you remain at higher risk and should seek help early when unwell.

Related tests, treatments or support

An infection work-up often combines observations and an early warning score with blood tests, blood cultures, a urine test, swabs of any likely source, and sometimes a chest X-ray or a scan to find a hidden source. If sepsis is suspected, treatment is bundled with these tests rather than waiting for every result. Your clinician should explain why each is chosen.

Follow-up & long-term care

How you get your results depends on the setting. You should leave knowing which results are still pending (especially blood cultures), when and how you will get them, who will act on them, and exactly which warning signs mean you should call 999. If you were referred on or admitted, make sure you understand the plan.

• Complete any antibiotic course and attend reviews to check the infection has cleared.
• Look after the source of infection, such as a wound, until it has healed.
• If you have a long-term condition, keep it well managed to reduce infection risk.
• Keep up recommended vaccinations, especially if you have a weakened immune system or no spleen.

Repeat, follow-on and what comes next

• Antibiotics are commonly changed once culture results show the specific bug, or stopped if infection is not confirmed.
• An unclear source may need further tests or scans over the following days.
• If you deteriorate, you should be re-assessed urgently rather than relying on an earlier reassuring result.

Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.

What good aftercare looks like

• Clear written advice on the sepsis red flags that mean you should call 999.
• A named way to get pending culture results, with someone responsible for acting on them.
• A treatment plan, including completing or adjusting antibiotics, shared with your GP.
• A safety net for re-assessment if you do not improve as expected.

What affects the cost

Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:

• How urgently you are seen and whether the assessment is in a same-day unit or an outpatient clinic
• Which clinician assesses you (acute physician or general physician)
• How many blood tests are needed, including blood cultures and inflammation markers
• Urine tests, swabs and other samples to find the source
• Whether you need a chest X-ray or a scan, and whether contrast dye is used
• Any antibiotics or other treatment, monitoring, follow-up or admission

• The clinician's assessment fee and which specialty they are from
• The cost of blood tests, including blood cultures and inflammation markers
• The cost of urine tests, swabs, X-ray or scans, and reporting
• Whether any antibiotics or other treatment are included
• What happens, and what it costs, if you need admission or further tests
• How and when pending results (such as cultures) are communicated, and who acts on them
• The cancellation policy and what happens if you deteriorate

On the NHS? Suspected sepsis and acute infection are assessed and treated on the NHS through 999, A&E and acute medical units when clinically indicated; private same-day assessment is mainly used for speed, choice or a second opinion in stable patients, and is never a substitute for emergency care when red flags are present.

You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.

Consent traps and marketing red flags

These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.

Choosing a specialist safely

• Check the specialist is on the GMC Specialist Register for this area.
• Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
• You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
• Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
• You're entitled to your total cost in writing — including any follow-up — before you decide.

How Vuemedics verifies every consultant →

Take this to your consultation. A good specialist will welcome every one of these.

• Where do you think the infection is, and how severe is it?
• Am I showing any signs of sepsis, and how closely do I need monitoring?
• Have you started antibiotics, and when will the culture results adjust them?
• Exactly which warning signs mean I should call 999?
• Which results are still pending, and how and when will I get them?
• Do any of my conditions or medicines put me at higher risk?
• Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
• Will you be the specialist who carries out my test, and who looks after me afterwards?
• What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
• What does a realistic result look like — and what can this test not achieve?
• What are my options, including waiting, doing nothing for now, or choosing a different approach?
• Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
• What is the total cost in writing, including any follow-ups, and how much time do I have to decide?

Find a verified specialist for sepsis and acute infection assessment

Every consultant is GMC-checked and independently reviewed. Search by postcode and distance, or switch to a map. Ordered by rating, relevance and recency — never by who pays.

How we made this page

Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →

Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.

Sources & standards: NHS — Sepsis UK Sepsis Trust — Spotting the signs of sepsis NICE NG253 — Suspected sepsis in people aged 16 and over NHS — When to call 999 Society for Acute Medicine — Same Day Emergency Care NICE NG254 — Suspected sepsis in people under 16 NICE NG255 — Suspected sepsis in pregnancy or recent pregnancy nidirect — Urgent and emergency care services nidirect — GP out-of-hours service

Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.

Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.