Membership information 800 908 433
Medicolegal advice 800 908 433

Consent – the basics

14 May 2021


Consent is at the heart of the provision of patient care and touches every aspect of the doctor-patient relationship. In each stage of your care of a patient, consent should be at the forefront of your mind. It is a dynamic process - or conversation - that can occur over a period of time, and extends beyond the signing of any consent form. 

Why is consent important?

Respect for patients’ autonomy is expressed in common law; to impose care or treatment on competent people without respecting their wishes and right to self-determination is not only unethical, but may be illegal. Failure to obtain informed consent can result in civil action being brought, regulatory proceedings, disciplinary action, and criminal charges.

How to obtain consent

Consent may be implied or express. The Medical Council of Hong Kong (MCHK) states that in respect of minor and non-invasive treatments, consent can usually be implied from a patient’s conduct in consulting the doctor for his or her illness, though not in a situation where the consultation was only for the purpose of seeking an opinion.Oral consent is acceptable for minor invasive procedures. Documenting oral consent in the patient’s medical records offers protection to doctors, in case of subsequent dispute as to whether consent has been given.

Express and specific consent is required for major treatments, invasive procedures, and any treatment which may have significant risks. S. 2.5 of the Code of Professional Conduct specifically says:

“(a) Consent for surgical procedures involving general/regional anaesthesia and parenteral sedation must be given in writing.

(b) For written consent, a reasonably clear and succinct record of the explanation given should be made in the consent form. The patient, the doctor and the witness (if any) should sign the consent form at the same time. Each signatory must specify his name and the date of signing next to his signature.”

Patients have the right to withhold their consent, provided they are competent to do so. 

All discussions around consent should be clearly documented, including the options available (including the option of taking no action), associated risks and benefits, any concerns or queries raised by the patient, and decisions reached.

Key principles

According to the MCHK, consent is valid if:

• It is given voluntarily

• The doctor has provided proper explanation of the nature, effect and risks of the proposed treatment and other treatment options (including the option of no treatment)

• The patient properly understands the nature and implications of the proposed treatment.

Explaining the treatment

MCHK’s Code of Professional Conduct says that it is the doctor’s duty to ensure that the patient truly understands the doctor’s explanation about the proposed treatment and the related risks and benefits. Therefore, an explanation should be given in clear, simple and consistent language, and in terms that the patient can understand.

According to the Code, the explanation should cover not only significant risks, but also risks of serious consequence even though the probability is low (i.e. low probability serious consequence risks).

The Code also provides that a doctor should not withhold information necessary for making a proper decision for any reason, even if the patient’s family members ask for the information to be withheld from the patient, unless in the doctor’s judgment the information will cause serious harm to the patient (such as where the information may have a serious effect on the patient’s mental health). However the threshold for withholding information is high, and upsetting the patient or causing him to refuse treatment will not be proper justification for withholding information. Any decision to withhold information must be recorded in the patient’s records.


The MCHK says: “Consent given by a child under the age of 18 years is not valid, unless the child is capable of understanding the nature and implications of the proposed treatment.” Where the child cannot understand, consent should be obtained from the child’s parent or guardian. However, even where a child is competent to give valid consent, the MCHK says a doctor should encourage the child to involve the parents in decision-making, with regards to important or controversial procedures.

According to the Code, it is usually sufficient to obtain consent from one parent, but in major or controversial medical procedures, “there may be the duty to consult the other parent.” In cases where the parents cannot agree on a decision, or where they refuse treatment that is clearly in the best interests of the child, legal advice should be sought.

More information