Glasgow Coma Scale

The Glasgow Coma Scale, often shortened to GCS, is a way of scoring how responsive a person is after a serious illness or injury. In first aid, it is most often mentioned when a person has a Head Injury, is becoming less alert, or may be Unresponsive.

What does the Glasgow Coma Scale measure?

The Glasgow Coma Scale looks at three things:

• eye opening
• verbal response
• motor response

Together, these checks help show how well the brain is responding at that moment.

The score can range from 3 to 15.

• 15 means the person is responding well
• a lower score means the person is less responsive
• a very low score suggests a serious problem and urgent medical care

Is the Glasgow Coma Scale the same as AVPU?

No. AVPU is a quicker and simpler check. It asks whether the person is alert, responds to voice, responds to pain, or is unresponsive.

The Glasgow Coma Scale is more detailed because it gives a score based on eyes, speech, and movement. In plain English, AVPU is the faster first look, while the Glasgow Coma Scale is the more detailed scale.

When might you hear it used?

You may hear the term Glasgow Coma Scale when someone:

• has had a head injury
• may have a serious illness affecting the brain
• is becoming harder to wake
• is getting more confused
• is not responding normally

It is often used by paramedics, nurses, and doctors, but it can still help first aiders understand what professionals are checking.

What do the three parts mean?

Eye opening

This checks whether the person opens their eyes on their own, when you speak to them, when pain is applied by a professional, or not at all.

Verbal response

This checks whether the person speaks clearly, sounds confused, makes unclear sounds, or does not speak at all.

Motor response

This checks whether the person moves normally, follows commands, reacts abnormally, or does not move in a meaningful way.

Why does the Glasgow Coma Scale matter in first aid?

It matters because a drop in responsiveness can be a sign that the person is becoming more seriously unwell. Even if you are not scoring the scale yourself, the same idea is important in first aid: notice whether the person is alert, whether they are getting worse, and whether emergency help is needed.

If a person is less responsive after a fall, crash, blow to the head, seizure, stroke, or unexplained collapse, call 000 for urgent help.

What should you do if someone seems less responsive?

In first aid, keep the response practical:

1. Check whether the scene is safe.
2. Try to get a response.
3. Check whether the person is breathing normally.
4. Call 000 if the person is not responding normally or you suspect a serious injury.
5. Use the Recovery Position if they are unresponsive but breathing normally.
6. Start CPR if they are unresponsive and not breathing normally.

How does this fit into a broader assessment?

The Glasgow Coma Scale is one part of a broader Neurological Assessment. It may sit alongside checks such as AVPU, pupil changes, limb weakness, speech problems, and repeated Reassessment.

Quick answer

The Glasgow Coma Scale is a scoring system used to describe how responsive a person is after a serious illness or injury. It looks at eye opening, speech, and movement, and a lower score means the person is less responsive and may need urgent medical care.

Sources reviewed

• ANZCOR Guideline 3: unconscious person

Reviewed against current Australian first aid, emergency and public-health guidance by the First Aid Glossary Editorial Team. This article is general information and does not replace emergency-operator directions, professional medical advice or hands-on first aid training.