Misdiagnosis vs Delayed Diagnosis: What’s the difference?

3 minute read

We often speak with patients who believe that something has gone wrong with their diagnosis but are unsure whether it amounts to negligence.

Two of the most common issues we see are misdiagnosis and delayed diagnosis. While they are closely related, they are not the same, and the distinction can be important when assessing whether a claim may arise.

What is a misdiagnosis?

A misdiagnosis occurs where a healthcare provider identifies the wrong condition.

This can lead to incorrect treatment, unnecessary procedures or a failure to treat the underlying illness altogether.

Examples could include:

• Diagnosing a benign condition when a patient is in fact suffering from cancer.
• Treating symptoms as a minor illness when they relate to a more serious condition.
• Incorrectly attributing symptoms to psychological causes rather than a physical illness.

In these situations, the issue is not just that the diagnosis was wrong, but that it fell below the standard of care expected of a reasonably competent practitioner.

What is a delayed diagnosis?

A delayed diagnosis arises where the correct diagnosis is eventually made, but not within a reasonable timeframe.

This delay can allow a condition to progress, sometimes leading to avoidable harm.

Common examples include:

• A failure to refer a patient for further investigation.
• Delays in ordering or interpreting test results.
• Repeatedly dismissing symptoms without appropriate follow-up.

In many cases, the key question is whether the delay made a material difference to the outcome.

Why does the distinction matter?

Not every misdiagnosis or delay will amount to medical negligence

Medical professionals are not expected to be perfect, and some conditions can be difficult to diagnose, particularly in their early stages.

To establish negligence, three elements must usually be present:

1. A duty of care owed to the patient.
2. A breach of that duty, meaning care fell below the accepted standard.
3. Causation, showing the breach caused harm that would otherwise have been avoided.

If all three are proven, the patient may be entitled to compensation.

When could a misdiagnosis and delayed diagnosis claim arise?

Misdiagnosis and delayed diagnosis are both recognised potential causes of medical negligence claims in Ireland, particularly where they result in delayed treatment or worsening of a condition.

A claim may arise where:

• A condition should reasonably have been identified earlier.
• Symptoms were not properly investigated.
• Test results were misread or overlooked.
• A patient was not referred to a specialist when appropriate.

What should you do if you are concerned about misdiagnosis or delayed diagnosis?

If you are worried that your condition was misdiagnosed or diagnosed too late, there are some practical steps you can take:

• Request a copy of your medical records.
• Make a note of your symptoms and timeline.
• Seek a second medical opinion.
• Consider speaking with a solicitor experienced in medical negligence.

Taking early advice can help you understand whether the circumstances meet the legal threshold for a claim and what options may be available to you.

Speak with our medical negligence team

If you believe you have suffered harm as a result of a misdiagnosis or delayed diagnosis, we can help.

Contact Us to discuss your situation with a member of our medical negligence team, or visit Medical Negligence Claims to learn more about our services.

In contentious business, a solicitor may not calculate fees or other charges as a percentage or proportion of any award or settlement.

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