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Fever of unknown origin (FUO) refers to a condition in which the patient has an elevated temperature for which no cause can be found despite investigations by one or more qualified physicians. [ 1 ] [ 2 ] [ 3 ] If the cause is found, it is usually a diagnosis of exclusion , eliminating all possibilities until only the correct explanation remains.
An example of such a diagnosis is "fever of unknown origin": to explain the cause of elevated temperature the most common causes of unexplained fever (infection, neoplasm, or collagen vascular disease) must be ruled out. Other examples include: Fibromyalgia [9] Adult-onset Still's disease [10] Behçet's disease [11] Bell's palsy [12]
This is a shortened version of the sixteenth chapter of the ICD-9: Symptoms, Signs and Ill-defined Conditions. It covers ICD codes 780 to 799 . The full chapter can be found on pages 455 to 471 of Volume 1, which contains all (sub)categories of the ICD-9.
An idiopathic disease is any disease with an unknown cause or mechanism of apparent spontaneous origin. [1]For some medical conditions, one or more causes are somewhat understood, but in a certain percentage of people with the condition, the cause may not be readily apparent or characterized.
fever of unknown origin G, g gram(s) GFR glomerular filtration rate GI gastrointestinal GVHD graft-versus-host disease: G6PD glucose-6-phosphate dehydrogenase GU genitourinary Gy gray H, h, hr hour(s) '/24' is generally used in some regions. Hb hemoglobin HCl hydrochloric acid; hydrochloride HCO3 bicarbonate Hct hematocrit Hg mercury HIPAA
Alkhurma hemorrhagic fever: AKI Acute kidney injury: AIDS: Acquired immune deficiency syndrome AIP Acute intermittent porphyria: ALA DD Doss porphyria/ALA dehydratase deficiency/Plumboporphyria (the disease is known by multiple names) ALD Alcoholic liver disease: ALI Acute lung injury: ALL Acute lymphoblastic lymphoma, acute lymphocytic ...
A rash and arthritis develop 2–4 days after the initial onset. Less commonly the infection can cause pneumonitis, endocarditis or meningitis. As these symptoms are common to many febrile diseases, this is often classified as a fever of unknown origin (FUO). If untreated, death will occur in approximately 10% of cases. [4]
In endemic areas, diagnosis is generally made on clinical grounds alone. However, overshadowing of the diagnosis is quite often as the clinical symptoms overlap with other infectious diseases such as dengue fever, paratyphoid, and pyrexia of unknown origin (PUO).