The Silver Brief

Sepsis is a life-threatening medical emergency in which every hour matters. When recognised early, treatment is often highly effective. However, when diagnosis is delayed, the consequences can be devastating. Across England and Wales, concerns about a delayed sepsis diagnosis are increasing—particularly where early warning signs were missed or not acted on quickly enough.

This guide explains what a delayed sepsis diagnosis means, including cases where sepsis is missed or misdiagnosed, when it may amount to medical negligence, and what patients and families can do.

Delayed sepsis diagnosis: Quick answer and key facts

A delayed sepsis diagnosis may be medical negligence if healthcare professionals failed to recognise symptoms that a reasonably competent clinician would have identified, and that delay led to a worse outcome—such as organ failure, long-term complications, or death.

Not every delay is negligent. The key issue is whether earlier diagnosis would likely have improved the outcome.

What is sepsis?

Sepsis is the body’s extreme and life-threatening response to an infection. Instead of fighting the infection normally, the immune system overreacts and begins to damage the body’s own tissues and organs. It can develop from common infections, including:

• Chest infections
• Urinary tract infections
• Abdominal infections
• Skin injuries or wounds

Sepsis can progress rapidly—sometimes within hours—from mild symptoms to septic shock and organ failure.

Because of this, early recognition and treatment are critical.

Why is early diagnosis of sepsis so important

Sepsis is often described as a time-critical condition.

There is a well-recognised treatment window—sometimes referred to as the “golden hour”—where prompt care can significantly improve survival rates. Delays in diagnosis can lead to:

• Rapid deterioration
• Organ failure
• Longer hospital stays
• More invasive treatment
• Increased risk of death

Even relatively short delays can have serious consequences.

Find out more: Duty of candour explained: Your rights as a patient in England and Wales

When does a delayed or missed sepsis diagnosis become medical negligence?

Not every missed or delayed diagnosis is negligent. To establish a legal claim in England and Wales, three elements must be proven:

1. Duty of care

A healthcare professional owed you a duty of care.

2. Breach of duty

The care fell below the standard expected of a reasonably competent clinician. In sepsis cases, this may include:

• Failing to recognise “red flag” symptoms
• Not carrying out appropriate observations
• Ignoring a high NEWS2 score
• Failing to act on signs of deterioration

3. Causation

The delay must have caused harm. This usually means showing that earlier diagnosis and treatment would likely have led to a better outcome.

You may also find this helpful: Medical negligence explained: Breach of duty and causation

The sepsis six and the standard of care

In the UK, suspected sepsis should trigger the “Sepsis Six”—a set of urgent interventions ideally started within one hour. These include:

Give:

• Oxygen
• Intravenous antibiotics
• Intravenous fluids

Take:

• Blood cultures
• Blood tests (including lactate levels)
• Urine output monitoring

These steps are widely used across the NHS as part of standard sepsis management protocols, and Trusts use specific screening tools. Failure to initiate these steps promptly, where clinically indicated, may suggest a breach of duty.

Common causes of delayed or missed sepsis diagnosis

Delays can happen at different points in the patient journey.

Missed symptoms in primary care

Symptoms may be mistaken for a minor illness, with no advice given on when to seek urgent care.

Triage delays in A&E

Patients may not be prioritised correctly, leading to dangerous waiting times.

Failure to monitor deterioration

Changes in vital signs may not be recognised or acted on.

Communication failures

Test results or concerns may not be communicated effectively between staff.

Failure to escalate care

Deteriorating patients may not be reviewed by senior clinicians in time.

See also: Delayed medical diagnosis and misdiagnosis claims: Understanding your rights

Symptoms of sepsis that should not be missed or misdiagnosed

Sepsis can be difficult to identify, but there are key warning signs. In adults, these may include:

• Confusion or altered mental state
• Extreme shivering or muscle pain
• No urine passed in a day
• Severe breathlessness
• Mottled or discoloured skin

In children, symptoms can differ and may include:

• Fast breathing
• Unusual sleepiness
• Weak or high-pitched cry
• Poor feeding

Failure to act on these symptoms quickly can lead to serious harm.

The impact of a delayed diagnosis

A delayed sepsis diagnosis can have life-changing consequences. These may include:

• Organ damage (kidneys, heart, lungs)
• Amputation due to poor circulation
• Post-sepsis syndrome, including fatigue and PTSD
• Long-term disability
• Death

Many patients and families describe a rapid deterioration after initially being reassured—making the experience particularly distressing.

Do you have a claim for delayed or misdiagnosed sepsis?

You may have a potential claim if:

• Sepsis symptoms were not recognised in time
• There was a delay in diagnosis or treatment
• Your condition worsened as a result
• Earlier intervention would likely have improved the outcome

A poor outcome alone is not enough. The focus is on whether the care fell below acceptable standards.

What to do if you are concerned about a delayed diagnosis

If something does not feel right, taking action early can help:

• Ask directly whether sepsis has been considered
• Seek urgent medical attention if symptoms worsen
• Request a second opinion if concerns persist
• Keep a timeline of symptoms and medical visits
• Request copies of medical records

Being proactive can make a critical difference—both medically and in understanding what happened.

What evidence is important?

Key evidence in delayed sepsis diagnosis cases includes:

• GP and hospital medical records
• A&E triage notes
• NEWS2 charts
• Blood test results
• Witness accounts from family members
• Independent expert opinions

These help establish whether warning signs were missed and whether earlier action would have changed the outcome.

Time limits for making a claim

In most cases, you have three years to start a claim. This runs from:

• The date of the incident, or
• The date you became aware something may have gone wrong

Exceptions apply for children and those without mental capacity.

Support and information organisations

If you have been affected by sepsis, these organisations can help:

• UK Sepsis Trust – Information, support, and awareness resources
• AvMA (Action against Medical Accidents) – Independent advice on medical accidents
• PALS (Patient Advice and Liaison Service) – Help with NHS concerns and complaints
• Healthwatch England – Guidance on patient rights and local services
• Citizens Advice – Free, independent advice on your options

These services do not provide compensation but can help you understand what happened and what steps to take.

See also: No Win No Fee medical negligence claims: Costs, risks & funding

Frequently asked questions

Delayed sepsis diagnosis: Concluding thoughts

A delayed sepsis diagnosis is often a traumatic experience that leaves patients and families searching for answers.

While not every delay is avoidable, failures to recognise or act on warning signs can have devastating consequences. Understanding how sepsis should be identified—and what standards apply—can help patients ask the right questions and seek clarity when something goes wrong.

This guide is based on general principles of English and Welsh law, is intended for informational purposes only, and does not constitute legal advice or establish a professional relationship.