Intrinsic Risk Factors include an assessment of the following

General health status – Does the patient present multiple health issues? Conditions such as diabetes mellitus and respiratory conditions may increase a patient's risk for the development of pressure ulcers.
Mobility status – Reduced mobility affects the ability to relieve pressure on vulnerable tissues.
Nutritional status – Poor nutrition may 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 – The effects of incontinence and body temperature should be considered when assessing skin's condition.
Age – The effects of age may increase risk. However, if a mix of risk factors are present, pressure ulcers can occur at any age.
History of previous pressure ulcers – Healed ulcer sites represent a high risk as scar tissue may only be 80% as strong as original tissue.
Drug history – Steroids are an example of a drug that may affect skin integrity.
Perfusion / oxygenation related issues – CVS instability, inotrope support, and oxygen requirements are all reported to increase the risk of pressure ulcers.