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I now have comprehensive information from the textbooks. Here is a thorough definition of consent in medicine:

Consent in Medicine

Definition

Consent is a patient's voluntary agreement to receive a proposed medical examination, investigation, or treatment, made with adequate understanding of the nature, purpose, risks, benefits, and available alternatives of that intervention.
At its core, consent rests on the common law principle that every person has the right to have their bodily integrity respected. Any touching of another person - including medical or surgical procedures - constitutes a potential battery unless the patient has voluntarily agreed to it.
"There is a presumption that a person should not be exposed to risk unless he has voluntarily accepted that risk, based on adequate information and adequate comprehension."
  • Scott-Brown's Otorhinolaryngology, Head & Neck Surgery

Key Elements of Valid Consent

For consent to be legally and ethically valid, three conditions must be met:
  1. Voluntariness - The decision must be free from coercion, pressure, or undue influence.
  2. Capacity - The patient must have the mental and cognitive ability to understand and weigh the information given.
  3. Information - Adequate information must be provided, including:
    • The nature and purpose of the procedure
    • Material risks and potential complications
    • Benefits of the proposed treatment
    • Available alternatives, including the option of doing nothing

Informed Consent

Informed consent goes beyond a signature on a form - it is an active communication process between clinician and patient. As described in Pye's Surgical Handicraft:
"Each patient having an operation has to sign a consent form after the nature of the operation has been explained to him - informed consent. It is most important that the patient understands what is involved."
The patient must also "agree that the operative and anaesthetic techniques can be varied as considered necessary."

What Risks Must Be Disclosed?

Courts and guidelines specify that when deciding which risks to disclose, clinicians must consider:
  • The probability of the risk occurring
  • The severity of harm if the risk materializes
  • Whether the risk is specific to this operation (vs. a common surgical risk)
  • The individual patient's circumstances (e.g., a 1-in-2000 risk of deafness matters far more to a patient who only has one functioning ear)
The landmark UK case Montgomery v. Lanarkshire Health Board (2016) shifted the legal standard away from medical paternalism to "what a reasonable person in the patient's position would want to know" - effectively ending the era of the Bolam test applying to consent. This enshrined the 2008 GMC guidance: Consent: Patients and Doctors Making Decisions Together.

Types/Forms of Consent

TypeDescription
Expressed (explicit)Clearly stated verbally or in writing (e.g., signing a consent form)
ImpliedInferred from the patient's actions (e.g., rolling up a sleeve for an injection)
InformedGiven after full disclosure of risks, benefits, and alternatives
EmergencyDoctrine of necessity allows treatment in the patient's best interest when consent cannot be obtained

Who Can Give Consent?

There are three main categories (Department of Health Reference Guide to Consent):

1. Adults With Capacity

Any competent adult (typically 18+) can give or withhold consent. A patient may refuse even life-saving treatment if competent to do so.

2. Children and Young People

  • Over 16: Can consent as if an adult (Family Law Reform Act 1969, Section 8[1])
  • Under 16: Governed by the Gillick principle - a child under 16 can give valid consent if they have sufficient "understanding and intelligence to understand fully what is proposed" (Gillick v. West Norfolk AHA)
  • If the child lacks Gillick competence, parents or those in loco parentis provide consent

3. Adults Without Capacity

Under the Mental Capacity Act 2005, incapacitated adults cannot have consent provided by another person on their behalf - instead, the doctrine of necessity permits a doctor to treat when it is in the patient's best interest.
The five principles of the Mental Capacity Act 2005 are:
  1. A person must be assumed to have capacity unless proven otherwise
  2. All practicable steps to assist decision-making must be taken before declaring incapacity
  3. An unwise decision does not equal incapacity
  4. Any act on behalf of an incapacitated person must be in their best interests
  5. The least restrictive option must be chosen

Legal Consequences of Failure to Obtain Consent

Proceeding without consent exposes the clinician to three forms of legal jeopardy (Scott-Brown's Otorhinolaryngology):
  1. Criminal battery (rare but possible)
  2. Civil battery - damages can be sought even if the procedure was competently performed
  3. Negligence - most common; the claimant argues they were not warned of a risk that materialized, and would have refused had they been warned ("but for" causation)

Key Legal Milestones

CaseSignificance
Bolam testDoctors set the standard of disclosure (medical paternalism)
Sidaway (1984)"Substantial risk of grave adverse consequences" must be disclosed regardless of practice
Chester v. Afshar (2004)Failure to warn can cause liability even without negligent technique
Montgomery (2016)Shifted standard to what a reasonable patient would want to know
Sources:
  • Scott-Brown's Otorhinolaryngology, Head & Neck Surgery, Vol. 1 (pp. 462-464)
  • Pye's Surgical Handicraft, 22nd Edition (p. 316)
  • Bailey and Love's Short Practice of Surgery, 28th Edition
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