HIV infection

Macrocytosis (increased MCV)

Carbon monoxide poisoning

Chronic lymphocytic leukaemia (CLL)

Cardiopulmonary resuscitation (CPR)

Ear wax

Drug poisoning

An unconscious patient

Myocarditis

Pulmonary hypertension

Thrombocytopenia

Cirrhosis of the liver

Secondary anaemia

Prehospital emergency care

Gout

Bradycardia

Coronary heart disease

Guillain-Barré syndrome (polyradiculitis)

Multiple sclerosis (MS)

Multiple myeloma (MM)