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What Is a Medical Error? | When Healthcare Decisions or Processes Deviate From the Intended Safe Plan

A medical error is a failure in a planned healthcare action or the use of an incorrect plan that creates or could create avoidable patient harm.

Errors can occur in diagnosis, medication, communication, procedures, documentation, handover or system processes.

Error Is Not the Same as Harm

An error can occur without causing injury, while harm can occur even when no error was made because some treatments carry unavoidable risk.

See What Is a Near Miss in Healthcare?.

Errors Can Be Individual or Systemic

Fatigue, cognitive bias and technical mistakes matter, but poorly designed systems can also make error more likely by creating ambiguous responsibility, confusing interfaces or weak handover.

Patient Safety Focuses on Prevention

Safety systems use verification, standardisation, escalation, communication and learning to reduce the chance that errors reach patients.

See What Is Patient Safety?.

Diagnostic Error Is One Form

Premature closure, missed results and failure to revisit a diagnosis when the patient deteriorates can all contribute to diagnostic error.

See What Is Clinical Reasoning?.

Learning Matters More Than Blame Alone

A useful safety response asks not only who made the mistake, but what conditions made the error possible and what changes can reduce recurrence.

The Medical Error Loop

event → detect → contain harm → investigate contributing factors → correct system or process → monitor for recurrence.

Educational boundary: This article explains medical error conceptually. Individual incidents require appropriate professional, institutional and regulatory review.

Explore the connected learning guides

Choose the question that brought you here. Open one useful guide, try a small task, and stop when you have what you need.

Take one question further

The same learning habit can travel across subjects, while each subject keeps its own methods. These routes help you notice a difficulty, understand one part of it, and return to something you can do.

A word is familiar, but using it is difficult.

Move from recognising a word to retrieving it in a new context. Understand vocabulary plateaus.

Try it without the guide: Choose one word you already know. Close the guide and use it in a new sentence. Explain why it fits; try another context tomorrow.

A piece of writing has ideas, but the reader loses the thread.

Make the order of events and the links between sentences clear. Explore composition writing.

Try it without the guide: Choose one short paragraph. Read the relevant explanation, close it, and revise the paragraph. Ask someone to tell you what happened and why.

The Mathematics seems familiar, but marks still disappear.

Find the first point where the working stops being reliable. Find Secondary 4 A-Math mark leakage.

Try it without the guide: For a Secondary 4 A-Math question you have attempted, locate the first uncertain line. Repair that step, then try a comparable question without the worked answer.

A Science fact is remembered, but the explanation is incomplete.

Connect the evidence to a scientific idea and the resulting change. Follow the Primary Science learning route.

Try it without the guide: Choose a familiar Primary Science example. Explain the evidence, the idea and the result without notes. Then change one condition and explain your prediction.

Two accounts of the world seem to disagree.

Check the question, source, date and evidence before combining claims. Explore the World Knowledge research library.

Try it without the guide: Take one claim. Find the source best placed to support it, note its date, and state what remains uncertain. Return to your original question.

There is plenty of help, but independence is hard to see.

Check what the learner can understand and do after support is removed. Understand how education works.

Try it without the guide: Choose one small task the child has practised. Agree on a calm, brief attempt without prompts. Use what happens to choose one next step, then stop.

For the structure behind these connections, read the eduKateSingapore runtime manifest and the eduKate ecosystem boot contract. The reader map describes public navigation; those manifests preserve the wider ownership and return rules.

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