Adult Social Care Glossary, v 0.6

2 Admission for assessment. (1) A patient may be admitted to a hospital and detained there for the period allowed by subsection (4) below in pursuance of an application (in this Act referred to as “an application for admission for assessment”) made in accordance with subsections (2) and (3) below. (2) An application for admission for assessment may be made in respect of a patient on the grounds that— (a) he is suffering from mental disorder of a nature or degree which warrants the detention of the patient in a hospital for assessment (or for assessment followed by medical treatment) for at least a limited period; and (b) he ought to be so detained in the interests of his own health or safety or with a view to the protection of other persons. (3) An application for admission for assessment shall be founded on the written recommendations in the prescribed form of two registered medical practitioners, including in each case a statement that in the opinion of the practitioner the conditions set out in subsection (2) above are complied with. (4) Subject to the provisions of section 29(4) below, a patient admitted to hospital in pursuance of an application for admission for assessment may be detained for a period not exceeding 28 days beginning with the day on which he is admitted, but shall not be detained after the expiration of that period unless before it has expired he has become liable to be detained by virtue of a subsequent application, order or direction under the following provisions of this Act.

3 Admission for treatment. (1) A patient may be admitted to a hospital and detained there for the period allowed by the following provisions of this Act in pursuance of an application (in this Act referred to as “an application for admission for treatment”) made in accordance with this section. (2) An application for admission for treatment may be made in respect of a patient on the grounds that— (a) he is suffering from mental disorder of a nature or degree which makes it appropriate for him to receive medical treatment in a hospital; and (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (c) it is necessary for the health or safety of the patient or for the protection of other persons that he should receive such treatment and it cannot be provided unless he is detained under this section[F3; and (d) appropriate medical treatment is available for him. (3) An application for admission for treatment shall be founded on the written recommendations in the prescribed form of two registered medical practitioners, including in each case a statement that in the opinion of the practitioner the conditions set out in subsection (2) above are complied with; and each such recommendation shall include— (a) such particulars as may be prescribed of the grounds for that opinion so far as it relates to the conditions set out in paragraphs (a) and [d) of that subsection; and (b) a statement of the reasons for that opinion so far as it relates to the conditions set out in paragraph (c) of that subsection, specifying whether other methods of dealing with the patient are available and, if so, why they are not appropriate. (4) In this Act, references to appropriate medical treatment, in relation to a person suffering from mental disorder, are references to medical treatment which is appropriate in his case, taking into account the nature and degree of the mental disorder and all other circumstances of his case.

Admitting someone to hospital for treatment, or keeping them there, if there are concerns about their mental health - even if they do not agree that they should be in hospital. It refers to various sections of the Mental Health Act that explain how and why a person can be kept in hospital. You have the right to appeal, and to get help from an independent mental health advocate.