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Written by: Demi-Leigh Mason
Reviewed by a Medico-Legal Expert
Last Reviewed:
September 2026
Written by: Demi-Leigh Mason
Reviewed by a Medico-Legal Expert
Last Reviewed:
September 2026
Obtaining valid consent is a cornerstone of medical practice, serving as both an ethical imperative and a legal requirement for doctors. It is essential for safeguarding against professional and legal liabilities. Both the General Medical Council (GMC) and the Nursing and Midwifery Council (NMC) mandate that consent must possess three core elements: it must be informed, voluntary, and given by a patient with the requisite capacity.
Crucially, consent is not a one-time event; it is a dynamic process, and a patient retains the right to withdraw it at any time. Ultimately, the patient is the final decision-maker, overriding the doctor’s preference, except in specific, legally defined situations, such as emergencies or when a patient is determined to lack capacity.
Doctors should obtain consent before any examination, procedure, treatment or intervention, as well as before sharing confidential information. Consent must be revisited when circumstances change, such as the emergence of new risks, delays in treatment or complications during care. Even routine interventions, such as blood tests or taking vital signs, require explicit consent when there is uncertainty about understanding or risk. Implied consent may suffice for very low-risk actions, but explicit consent is always preferable to ensure clarity and legal protection.
Legally, consent is not simply a signature on a form; it is a discussion ensuring that the patient understands the nature and purpose of the proposed intervention, the likely benefits, the potential risks and any alternatives, including the option of doing nothing. Doctors should check understanding by asking the patient to summarise in their own words, encourage questions and explore any concerns. Consent must always be voluntary, free from coercion or undue influence, including from family members or colleagues. The process should be tailored to the individual patient, addressing what matters to them and ensuring they feel able to make their own decision.
Comprehensive documentation of the consent process is vital. Your records must detail the explanation provided to the patient, including the risks and benefits discussed, and any alternatives considered. It is also essential to capture the patient’s questions, their responses, evidence that they understood the information, and their final decision.
Furthermore, documentation should include who was present, any communication aids used, and whether written consent was obtained. Crucially, the content of the consent conversation must be documented, even when a consent form has been signed. Failure to document a discussion legally presumes it never occurred, which carries significant medico-legal risks.
Certain situations require heightened attention. When a patient lacks capacity, the Mental Capacity Act 2005 guides action in the patient’s best interests, often involving consultation with family or legal representatives, and considering advance decisions or lasting powers of attorney. In emergencies, treatment without consent may be justified if immediate action is required to save life or previous serious harm. For children and young people, assessing competence ensures their views are taken into account, while parental consent may be sought when appropriate. Language barriers must be addressed using professional interpreters to ensure understanding; relying on family members can create legal risk.
The UK legal standard for consent was clarified in Montgomery v Lanarkshire Health Board 2015. Doctors are required to disclose material risks – those that a reasonable person in the patient’s position would find significant. This emphasises the importance of individualised discussions rather than standardised risks. Failure to adequately inform patients about material risks or to properly document discussions can constitute negligence, with potential legal and professional consequences.
Doctors frequently encounter scenarios where obtaining consent is challenging. One common situation is when a patient defers entirely to the doctor with statements such as “do whatever you think is best”. Legally, this is not valid consent; the doctor must explore the patient’s values, clarify understanding of risks and alternatives, and document the discussion.
Another scenario occurs when a patient refuses life-saving treatment. Doctors must first confirm that the patient has capacity, ensure they fully understand the consequences and document the discussion in detail. Conflicts between family members and the patient also present difficulties; the patient’s decision takes precedence if they are capacitous.
Patients may sometimes appear hesitant or uncertain despite giving verbal agreement or signing a form. In these cases, doctors should pause, provide further explanation and allow additional time if possible. Cultural or religious beliefs can influence consent and may require sensitive discussion to respect the patient’s values while ensuring legal compliance.
Time pressures in busy clinics or wards can complicate consent. Even brief discussions focusing on the most material risks, combined with careful documentation, are legally preferable to bypassing consent altogether. Finally, situations involving partial or fluctuating capacity, such as patients affected by acute illness, delirium or fatigue, require repeated explanations and confirmation of understanding, with detailed records of each discussion.
For doctors, valid consent is informed, voluntary, given by a patient with capacity and properly documented. It is an ongoing conversation that requires clarity, attention to individual circumstances and respect for patient autonomy. Awkward and difficult situations are common in practice, but careful explanation, confirmation of understanding and thorough documentation ensures that consent remains legally and ethically valid. Following GMC and NMC guidance alongside established legal principles protects both patients and doctors; supporting safe, professional and legally compliant practice.
If you’re not yet covered or are unsure about the level of protection you have, consider joining our medical defence membership that offers expert advice and support in medico-legal matters. Good Samaritan cover is just one of the many benefits of having robust medical defence protection.
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