 Burns can be classified by depth , mechanism of injury , extent , and associated injuries . The most commonly used classification is based on the depth of injury . The depth of a burn is usually determined via examination , although a biopsy may also be used . It may be difficult to accurately determine the depth of a burn on a single examination and repeated examinations over a few days may be necessary . In those who have a headache or are dizzy and have a fire @-@ related burn , carbon monoxide poisoning should be considered . Cyanide poisoning should also be considered . 
 Burns can be classified by depth , mechanism of injury , extent , and associated injuries . The most commonly used classification is based on the depth of injury . The depth of a burn <a href='drop_aux' title='1'><mark>is</mark></a>usually determined via examination , although a biopsy may also be used . It may be difficult to accurately determine the depth of a burn on a single examination and repeated examinations over a few days may be necessary . In those <a href='null_relcl' title='2'><mark>who</mark></a><a href='got' title='3'><mark>have</mark></a> a headache or <a href='drop_aux' title='4'><mark>are</mark></a>dizzy and <a href='got' title='5'><mark>have</mark></a> a fire @-@ related burn , carbon monoxide poisoning should be considered . Cyanide poisoning should also be considered . 
Burns can be classified by depth , mechanism of injury , extent , and associated injuries . da most commonly used classification is based on tdadepth of injury . The depth of a burn usually determined via examination , although a biopsy may also be used . It may be difficult to accurately determine the depth of a burn on a single examination and repeated examinations over a few days may be necessary . In those got a headache or dizzy and got a fire @-@ related burn , carbon monoxide poisoning should b considered . Cyanide poisoning should also bbconsidered .