Intrinsic risk factors include an assessment of the following

General health status – Does the patient present with multiple health issues? Conditions such as diabetes mellitus or respiratory conditions which are reported to predispose a patient to an increased risk.
Mobility status – Reduced mobility affects the ability to relieve pressure on vulnerable tissues.
Nutritional status – Poor nutrition can have multiple effects. Nutritional status can be assessed though simple weight monitoring and the assessment of specific indicators such as haemoglobin or serum albumin.
Skin moisture – This is a multi facetted section. Awareness of incontinence is critical however one should also consider increased body temperature and its effects.
Age – Effects of age have been shown to be associated with increased risk, however be aware that pressure ulcers can occur at any age if a mix of risk factors are present.
History of previous pressure ulcers – Healed ulcer sites represent a high risk site as scar tissue will be up to 80% original tensile strength.
Drug history – Such as use of steroids which can affect skin integrity.
Perfusion/oxygenation related issues – CVS instability, inotrope support, oxygen requirement, are reported to increase the risk of pressure ulcers.