What is Medical Consent?

Medical consent is the permission a patient gives a healthcare professional before any examination, investigation, treatment, or procedure is performed.

Consent is fundamental in medicine because it:

Respects patient autonomy
Protects patient rights
Builds trust
Is a legal and ethical requirement

Without valid consent, treatment may legally amount to battery or assault.

Medical Consent: Quick Summary

Consent must usually be obtained before treatment.
Valid consent must be:
- Voluntary
- Informed
- Given by someone with capacity
Consent can be verbal, written, or non-verbal.
Patients can withdraw consent at any time.
Different rules apply for:
- Adults
- Children
- Emergencies
- Patients lacking capacity
Consent links closely with:
- Capacity
- Confidentiality
- Medical ethics

Why Consent Is Important

Consent is important because it:

Protects patient autonomy
Allows shared decision-making
Ensures patients understand risks and benefits
Maintains trust in healthcare
Prevents coercion or unwanted treatment

Good consent is not simply “getting a signature.” It is a communication process.

Types of Consent

1. Verbal Consent

Spoken agreement.

Example:
“Is it okay if I examine your abdomen?”
“Yes.”

Used for:

Simple examinations
Routine procedures

2. Written Consent

Signed consent form.

Used for:

Surgery
Anaesthesia
Major procedures
Procedures with significant risks

3. Non-Verbal Consent

Consent communicated through actions.

Example:
A patient rolls up their sleeve for a blood pressure reading.

Still requires:

Explanation
Understanding
Capacity

The 3 Requirements of Valid Consent

1. Voluntary

The patient must decide freely without:

Pressure
Manipulation
Coercion

Example:
A patient should not be forced by relatives into agreeing to surgery.

2. Informed

The patient must understand:

What the treatment involves
Risks
Benefits
Alternatives
Consequences of refusing treatment

This is called informed consent.

3. Capacity

The patient must have mental capacity to decide.

Under the Mental Capacity Act 2005, capacity means the patient can:

Understand information
Retain information
Weigh information
Communicate a decision

Informed Consent

Informed consent is one of the most important concepts in modern medicine.

Doctors must explain:

Procedure details
Material risks
Alternative options
Potential complications
Recovery expectations

The explanation should be:

Clear
Honest
Tailored to the patient

The Montgomery Case

A key legal case in UK consent law is Montgomery v Lanarkshire Health Board.

Why it matters:

The case changed the standard for informed consent.

Doctors must now disclose:

Any material risk a reasonable patient would want to know.

This strengthened:

Patient autonomy
Shared decision-making

Capacity and Consent

Capacity and consent are heavily linked.

A patient with capacity:

Can consent
Can refuse treatment
Can withdraw consent

Even if refusal may lead to harm or death.

Example:
A patient with capacity can refuse chemotherapy or blood transfusions.

Can Consent Be Withdrawn?

Yes.

A patient with capacity may withdraw consent:

Before treatment
During treatment

Example:
A patient may initially agree to surgery but later change their mind.

Healthcare professionals must respect this.

Situations Where Consent Is Not Needed

Emergencies

If a patient:

Is unconscious
Needs urgent life-saving treatment

Doctors may act under implied consent.

The assumption is:

The patient would likely want life-saving treatment.

Mental Health Act

Under certain circumstances, patients with severe mental illness may be treated without consent under the Mental Health Act 1983.

Consent in Children

Under 16

Children may consent if they are:

Gillick competent

This means they have enough maturity and understanding.

Example:
A 15-year-old requesting contraception.

Age 16–17

Patients aged 16–17 can usually consent independently if they have capacity.

However:

Courts or parents may override refusal of life-saving treatment.

Gillick Competence

Gillick competence assesses whether a child under 16 understands:

The treatment
Risks
Consequences

If competent:

They may consent without parental permission.

Patients Who Lack Capacity

If a patient lacks capacity:

Nobody can simply “consent for them” (except specific legal arrangements like LPA).

Instead:

Doctors act in the patient’s best interests.

Factors considered:

Clinical benefit
Patient wishes
Beliefs and values
Family input
Previous statements

Best Interests

Best interests means choosing the option that:

Most benefits the patient
Minimises harm
Respects patient values

It does NOT simply mean:

“Do everything possible.”

Sometimes best interests may involve:

Palliative care
Limiting burdensome treatment
Comfort-focused care

Consent and Ethics

Autonomy

Patients control decisions about their own bodies.

Beneficence

Doctors act in patients’ best interests.

Non-maleficence

Avoid causing harm.

Justice

Treat patients fairly and equally.

Common Challenges in Consent

Language Barriers

Use:

Professional interpreters
Clear language

Avoid:

Using relatives as translators

Hearing or Communication Difficulties

May require:

Written communication
Sign-language interpreters
Visual aids

Complex Procedures

Doctors must explain complicated concepts in understandable terms.

Good communication is essential.

Consent in Medical School MMIs

Consent commonly appears in:

Ethics stations
Roleplay stations
Communication stations

Examples:

Asking to examine a patient
Dressing a wound
Explaining a procedure

Example MMI Consent Structure

Step-by-step approach:

Introduce yourself
Confirm patient identity
Explain procedure clearly
Explain risks/benefits
Check understanding
Ask if they have questions
Gain consent
Document consent

Emergency Consent Example

Question

“An unconscious patient arrives in A&E needing urgent surgery. What happens with consent?”

Model Points

Patient cannot provide consent
Emergency treatment proceeds under implied consent
Doctors act in best interests
Treatment should not be delayed
Once conscious, patient should be informed afterwards

High-Yield Interview Tips

DO:

Mention capacity frequently
Use ethical pillars
Prioritise patient autonomy
Mention communication
Show empathy

DON’T:

Assume family automatically decides
Ignore patient wishes
Forget emergencies are exceptions
Confuse consent with simply signing a form

One-Line Definitions for Interviews

Medical Consent

“Permission given by a patient for medical examination or treatment.”

Informed Consent

“Consent given after understanding risks, benefits, and alternatives.”

Capacity

“The ability to understand, retain, weigh, and communicate decisions.”

Best Interests

“The option that most benefits the patient while respecting their values and minimising harm.”

Questions & Answers

1. What is consent in medicine?

Consent is the voluntary, informed agreement by a patient to undergo examination, treatment, or investigation, after they have been given adequate information to make an informed decision.

It is a legal and ethical requirement before any intervention.

2. What are the types of consent?

Implied consent: inferred from actions (e.g. holding out arm for blood pressure)
Verbal consent: spoken agreement (e.g. most examinations)
Written consent: documented agreement (e.g. surgery, anaesthesia)

3. What are the key elements of valid consent?

For consent to be valid, it must be:

Voluntary (no coercion)
Informed (adequate information provided)
Given by a competent patient

4. What information must be provided for informed consent?

You must explain:

Diagnosis/condition
Purpose of treatment
Benefits
Risks (common and serious)
Alternatives, including no treatment
Likely consequences of refusal

5. How do you assess capacity?

A patient has capacity if they can:

Understand information
Retain it
Weigh it up
Communicate a decision

This is decision-specific and time-specific.

6. What is Gillick competence?

It refers to children under 16 being able to consent if they have sufficient understanding and intelligence to fully understand the treatment.

It comes from Gillick v West Norfolk and Wisbech Area Health Authority.

7. What is the difference between capacity and competence?

Capacity: applies to adults (Mental Capacity Act framework)
Competence (Gillick): applies to children under 16

Both assess ability to make a specific decision.

8. What is Fraser guidelines?

They are specific criteria allowing clinicians to give contraception advice/treatment to under-16s without parental involvement, if certain safeguarding criteria are met.

9. Can consent be withdrawn?

Yes. A patient can withdraw consent at any time, even immediately before or during treatment.

10. What happens if a patient lacks capacity?

If a patient lacks capacity:

Act in their best interests
Involve family/representatives where appropriate
Follow legal frameworks (e.g. Mental Capacity Act)
Consider advance directives or lasting power of attorney

11. When can treatment be given without consent?

Only in limited situations:

Emergency life-saving treatment when patient lacks capacity
Mental Health Act provisions (specific circumstances)
Court-authorised treatment

12. Can family consent for adults lacking capacity?

No. Decisions are made in the patient’s best interests.

13. What does “best interests” mean?

Choosing the option that most benefits the patient while respecting their wishes and wellbeing.

14. What is the Montgomery case?

Montgomery v Lanarkshire Health Board ruled doctors must explain all material risks a reasonable patient would want to know.

15. Can parents refuse treatment for an under 16 year old in the UK?

Parents can refuse consent for an under 16, however courts can authorise medically necessary treatment against parental wishes.

16.“A patient refuses a life-saving blood transfusion. What would you do?”

Answer

“I would first assess whether the patient has capacity by checking they can understand, retain, weigh, and communicate information about the decision.

If they have capacity, I would respect their autonomy even if refusing treatment may result in death. I would ensure they fully understand the risks and alternatives and explore their concerns sensitively and without judgement.

I would involve senior clinicians and consider alternative treatments where possible. Ethically, this situation involves balancing autonomy with beneficence and non-maleficence.”

Useful Links

https://www.nhs.uk/conditions/consent-to-treatment/

https://www.nhs.uk/conditions/consent-to-treatment/children/

https://www.gmc-uk.org/ethical-guidance/ethical-guidance-for-doctors/decision-making-and-consent

https://www.gmc-uk.org/ethical-guidance/ethical-guidance-for-doctors/0-18-years

https://www.medicalprotection.org/uk/guidance/consent

https://www.bma.org.uk/advice-and-support/ethics

https://www.nice.org.uk/about/what-we-do

https://www.mdu.com/guidance-and-advice/guides/consent-and-mental-capacity

https://www.rcpch.ac.uk/resources/consent

https://www.gov.uk/government/publications/mental-capacity-act-code-of-practice

https://www.bailii.org/ew/cases/