Study guide · concept · Medical law & ethics
Informed, implied and expressed consent on the CCMA
Implied consent is shown by conduct, expressed consent is given in words, spoken or written, and informed consent is the decision a patient makes after a full discussion of a procedure, its risks and its options. Sorting a stem into one of the three comes down to how the patient agreed and what they agreed to.
§01
Three names, two questions
How did the patient agree, and to what?
The three names overlap in everyday speech, but on the exam they don't. Start with how the agreement showed up: an action, a spoken yes, or a signature. Then ask what was agreed to: a routine step such as a pulse check, or something with real risk such as a biopsy. An action alone is implied consent; words alone are expressed; words that follow a full discussion of risk and options are informed.
Consent sits in Medical Law and Ethics, 7 of the 150 scored items in the 2022 test plan, and it shares ground with MA scope of practice, where the question is whose job each part of the process is.
- Implied consent
Agreement shown by action: holding out an arm for a pulse, opening the mouth for a thermometer, stepping onto the scale when called.
- Expressed consent
Agreement stated in words, spoken ("Sure, go ahead") or written. A signed form is expressed consent on paper.
- Informed consent
Agreement given after the patient has heard what the procedure is, what could go wrong, what it should achieve, and what else could be done, including doing nothing.
- Proxy consent
Given by a legally authorized representative, such as a healthcare power of attorney, when the patient can't decide.
§02
Everyday intake, sorted
Routine rooming runs on conduct and a spoken yes.
| What happens | Type | Why |
|---|---|---|
| Patient holds out an arm as you lift the BP cuff | Implied | The action is the agreement. |
| Patient opens their mouth as you raise the thermometer | Implied | Same: conduct, no words needed. |
| "May I check your pulse?" "Sure." | Expressed (spoken) | A clear verbal yes. |
| Patient signs the general consent-to-treat form at check-in | Expressed (written) | Routine care, agreed on paper. |
| Patient signs a mole-removal form after the procedure was discussed | Informed, recorded in writing | Risk and options were explained before the yes. |
Implied consent covers the routine. Anything with real risk gets a conversation first.
§03
Expressed vs informed
Every informed consent is expressed. The reverse doesn't hold.
| Feature | Expressed | Informed |
|---|---|---|
| How it's given | Spoken or written | Spoken or written, after a discussion |
| What it requires | A clear yes | Understanding of the procedure, its risks and its options |
| Typical use | Routine, low-risk care | Surgery, invasive procedures, treatments with meaningful risk |
| Paper trail | Optional when spoken | Usually a signed form plus a chart note |
Highlighted rows are where the two differ.
§04
Minors: default and exceptions
The default is the parent. State law writes the exceptions.
| Rule | What it means |
|---|---|
| Default | For non-emergency care of a patient under 18, a parent or legal guardian consents. |
| Emancipation | A minor the state treats as independent consents as an adult. |
| Mature minor | Some states let a minor who shows adult-level understanding consent to certain care. |
| Service-specific laws | Many states let minors consent to particular sensitive services; the list differs from state to state. |
§05
Consent across one procedure
Consent is a state, not a signature.
Before
Discussion
What the procedure is, its risks, and the alternatives. The patient's questions get answered before anything is signed.
Signing
The form records it
The signature documents a decision that was already made in the conversation.
Throughout
Still the patient's call
Consent stays open to withdrawal until the procedure is finished.
After
Chart it
The discussion, the signed form, and anything the patient said about their decision.
§06
Sort the stem in five seconds
Run this before rereading the stem.
- Did the patient act without saying anything? Implied.
- Did they say or sign yes to something routine? Expressed.
- Was there risk worth discussing before the yes? Informed.
- Is someone else deciding? Check that they hold legal authority for this patient.
§07
Practice: consent
8 questions. Pick an answer to see why it is right or wrong.
Settle who is deciding, and whether they're able to decide, before you read the options.
Before a minor in-office surgical procedure, who is responsible for obtaining the patient's informed consent?
Answer & explanation
Answer: C. The provider performing it
Informed consent requires explaining the diagnosis, the procedure, risks, benefits and alternatives, so the provider performing the procedure must obtain it. An MA may witness the patient's signature, which is why that option is tempting, but witnessing is not obtaining consent. Prepping the patient or assisting does not transfer this legal duty to the MA or nurse.
- The nurse may assist, but explaining risks and alternatives is the performing provider's legal duty.
- Prepping the patient is clinical support; it does not include obtaining informed consent.
- Correct: the provider performing the procedure explains it and obtains the patient's informed consent.
- An MA may witness the signature, but witnessing is not the same as obtaining consent.
A 16-year-old who is married and lives independently comes in for treatment. Who may give consent for her care?
Answer & explanation
Answer: D. The patient herself
A minor who is married, in the military or living independently is generally an emancipated minor and can consent to her own care. Requiring a parent is the usual assumption for minors, which makes that option tempting. A spouse cannot consent for a competent patient, and a court guardian is needed only when no one else has legal authority.
- A court-appointed guardian is needed only when no one has legal authority; she already does.
- A parent is the usual rule for minors, but marriage and independence make her emancipated.
- A spouse cannot consent for a competent patient who can decide for herself.
- Correct: a married minor living independently is generally emancipated and consents to her own care.
May a surgeon operate on a 15-year-old without a parent's or guardian's consent for a routine procedure?
Answer & explanation
Answer: B. No, consent from a parent or legal guardian is required
For most non-emergency procedures a minor cannot consent, so a parent or legal guardian must consent. Committee approval, the minor's wish, or a witness does not replace guardian consent.
- A 15-year-old's agreement matters, but it cannot replace legal consent for routine surgery.
- Correct: for non-emergency care, a parent or legal guardian consents on the minor's behalf.
- A witness confirms signatures; it does not give anyone authority to consent.
- An ethics committee advises on hard cases; it does not substitute for guardian consent.
Under what condition can a patient give informed consent for a new medication?
Answer & explanation
Answer: A. The provider explains the drug's benefits, risks, and alternatives.
Informed consent requires the provider to disclose the diagnosis, treatment, risks, benefits, and alternatives so the patient can decide. The MA may reinforce information but cannot obtain consent, and reciting side effects or timing rules is not the standard.
- Correct: consent is informed when the provider discloses benefits, risks, and alternatives and the patient can decide.
- A handout beforehand may help, but it does not replace the provider's explanation and discussion.
- The MA can reinforce information, but answering questions does not make the consent informed.
- No patient can recite every side effect; informed consent asks for understanding, not memorization.
An unconscious patient is brought into the clinic in a medical emergency, and no family is present. Under which type of consent does the team provide emergency treatment?
Answer & explanation
Answer: A. Implied consent
In an emergency, the law presumes a reasonable person would agree to life-saving treatment, so consent is implied. Informed consent is tempting because it is the standard for procedures, but it requires a patient or representative able to discuss risks and alternatives. Expressed consent is stated orally or in writing, and proxy consent requires an available decision-maker.
- Correct: in an emergency, the law presumes a reasonable person would agree to life-saving care.
- Informed consent requires a patient or representative able to discuss risks and alternatives, impossible here.
- Expressed consent is spoken or written, and an unconscious patient can give neither.
- Proxy consent requires an available decision-maker, and no family is present.
An MA is asked to witness a patient's signature on a surgical consent form. What does the MA's signature as witness confirm?
Answer & explanation
Answer: B. That the patient signed the form
A witness confirms only that the person who signed is the patient and that the signature was made voluntarily. Confirming the patient understood the risks is the provider's job in obtaining informed consent, the usual confusion. The MA does not explain the procedure for consent purposes or judge medical necessity.
- The witness does not judge medical necessity; that decision belongs to the provider.
- Correct: the witness confirms that the patient is the one who signed, and did so voluntarily.
- The MA does not explain the procedure for consent purposes; the provider does.
- Confirming understanding of risks is part of obtaining consent, which is the provider's job.
A 15-year-old asks to be tested for a sexually transmitted infection without involving her parents. In most states, what is true?
Answer & explanation
Answer: C. She can consent to this care herself
Most states let minors consent to specific services such as STI testing and treatment, so parental consent is not needed. Assuming a parent must sign is the general rule for minors, which makes it the tempting error, but these services are an exception. Emancipation and court orders are not required for this type of care.
- Emancipation is not required; STI care is one of the services minors can consent to themselves.
- Parental consent is the general rule for minors, but STI testing is a common statutory exception.
- Correct: most states let minors consent to STI testing and treatment on their own.
- No court order is needed; state law already allows minors to consent to this care.
A patient verbally withdraws consent partway through a procedure. What should the medical assistant do?
Answer & explanation
Answer: B. Stop, document the withdrawal, and notify the provider
Consent can be withdrawn at any time, so the assistant must stop, document the withdrawal, and inform the provider. Continuing without current consent exposes the office to battery and liability.
- Consent is ongoing; agreeing at the start does not bind the patient to finish.
- Correct: stop, record what the patient said, and let the provider address it with them.
- Being nearly finished does not restore consent; continuing would be battery.
- A verbal withdrawal is enough; waiting for paperwork means continuing without consent.
That is the whole set. Open any card to re-read its explanation, or start over.