Missed and Delayed Diagnosis: What Patients Can Do

What counts as missed and delayed diagnosis?

A missed diagnosis is a health problem that goes unrecognized when care is given. A delayed diagnosis is found later, after evidence existed earlier to act on it.

The World Health Organization groups these under diagnostic errors, which also include wrong and poorly explained diagnoses. Diagnosis is not one event. It is a step by step process: history, exam, testing, interpretation, communication and review. (World Health Organization, 2024)

Problems can arise at any stage. A delay alone does not prove a mistake. Some uncertainty is normal and takes time to sort out. An avoidable delay is different: the chance to act sooner was there, based on what was known then.

Where can the diagnostic process break down?

Breakdowns can occur before, during and after testing. A clinician may weigh the wrong causes. A sample may be mishandled. A result may arrive without anyone closing the loop with you. Follow up is a real stage, not an afterthought. (Bradford et al., 2024)

More testing is not always safer. A test used when disease is very unlikely can produce a false alarm, causing worry and needless treatment. The opposite also happens: a needed test is never ordered. Good care sits between the two.

Communication can break down. Suppose you and your care team agree that someone will discuss your scan result at your next visit. The visit happens. The result is never raised. You assume silence means all is well. The missing piece is the agreed discussion or the follow up that was indicated.

What do studies tell us about the scale of harm?

One selected study reviewed 2,428 adult medical inpatient records from 29 US academic hospitals. The patients were hospitalized in 2019 and later died or were moved to intensive care. Two trained clinicians reviewed each record. Diagnostic errors appeared in 23.0 percent of cases. In 17.8 percent, errors were judged to add to harm. (Auerbach et al., 2024)

This was a selected inpatient sample. It is not all hospital care, all visits or current national rates. The study does not show that errors caused every death. It does not show that any single fix prevents harm. It points to assessment and test handling as areas to improve.

This review identifies errors within its selected records. Those findings do not determine whether an error occurred in a different patient's care.

Does access to test results solve the problem?

No. Access and interpretation are different. A result shown in a portal is not the same as a clinician explaining what it means and what comes next. (Bradford et al., 2024)

A review of 71 studies on sharing blood test results in primary care found patients wanted timely results and clear next steps. Many found electronic release acceptable, but not everyone and not for every result. Ten studies were experiments, none randomized, and quality was mostly low. (Nankervis et al., 2025)

That review cannot show that portals prevent diagnostic errors. It also cannot show a flagged result means disease. Ask the care team what the result means and what comes next.

What can patients and families ask at each step?

You do not need to prove an error before asking for a fresh look. Safe care stays with clinicians and health systems. Your role is to share what you notice and ask questions.

Patient guidance reviewed in 2024 suggests bringing a symptom timeline, a list of medicines and supplements, and notes on what has changed. Ask what each test is for, its likely benefits and limits, and the risks of doing it or waiting. Ask when and how you will hear results, and who to contact if symptoms continue. (A.D.A.M., 2024)

Communication support matters. If you need an interpreter or other qualified language help, request it. A trusted support person is a separate, optional choice. Agree with the team on a route that works, such as a phone call or portal message. Check that it is truly available.

An official tool index covers clinician reflection, patient question lists, and lab test tracking from ordering through communication and follow up. These tools guide better talks. They are not trial proof that using them prevents errors. (Agency for Healthcare Research and Quality, 2025)

What should happen when symptoms persist or worsen?

Contact your clinician when symptoms are new, worse or not going away. Do the same if you have questions about results you have not heard. Follow the plan you agreed, and say plainly what has changed. (A.D.A.M., 2024)

If you cannot get a clear answer, ask for a review and for the next step to be written down. Ask what else could explain your symptoms and whether the working diagnosis still fits. You may ask whether another opinion would help. These are ordinary requests.

For severe or sudden symptoms, use urgent or emergency care. Do not wait for a routine visit. Practical guidance cannot cover every case or promise an outcome. It can help you get a clear, agreed next step.

A research review found 250 sources covering 260 patient and family engagement interventions in diagnosis. Most were grey literature. Only 37 were peer reviewed, with three small trials and high dropout. The evidence is too weak to establish effectiveness. Patients should be supported, not blamed or asked to make up for unsafe systems. (Hill et al., 2026)

For the wider picture, see our notes on why health is the wealth you cannot buy back and the real cost of ignoring your health.

This article is for informational and educational purposes only and does not constitute financial, legal, tax, medical, or professional advice. Individual results vary.