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1. • Clinically documented temperature of 101°F or higher

     • Fever of unknown origin is defined as a clinically documented temperature of 101°F or higher on several occasions, coupled with an unrevealing diagnostic workup. The differential diagnosis is broad but is typically categorized as infection, malignancy, noninfectious inflammatory disease, or miscellaneous.
     www.aafp.org/pubs/afp/issues/2022/0200/p137.html

     Fever of Unknown Origin in Adults | AAFP

2. www.healthline.com › health › fever-of-unknown-originAbout Fever of Unknown Origin - Healthline

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   A fever of unknown origin (FUO) is a fever of at least 101°F (38.3°C) that lasts for more than three weeks or occurs frequently without explanation.

3. www.aafp.org › pubs › afpFever of Unknown Origin in Adults | AAFP

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   Fever of unknown origin is defined as a clinically documented temperature of 101°F or higher on several occasions, coupled with an unrevealing diagnostic workup. The differential diagnosis is...

4. www.ncbi.nlm.nih.gov › books › NBK532265Fever of Unknown Origin - StatPearls - NCBI Bookshelf

   www.ncbi.nlm.nih.gov › books › NBK532265

   Aug 14, 2023 · There is no clear-cut diagnostic approach to fever of unknown origin (FUO). Thorough history with a focus on the most probable etiology based on the patient’s symptoms is the key to pinpoint the origin of FUO.

   • Author: Ilona Brown, Nancy A. Finnigan
   • Published: 2023/08/14

   • Publish Year: 2021

5. www.mayoclinic.org › diseases-conditions › feverFever - Diagnosis & treatment - Mayo Clinic

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   May 7, 2022 · Fever of unknown origin. When a fever lasts for more than three weeks — constantly or on several occasions — and there is no clear cause, it's usually called a fever of unknown origin. In these cases, you may need to see specialists in one or more medical fields for further evaluations and tests.

6. www.merckmanuals.com › fever-of-unknown-origin-fuoFever of Unknown Origin (FUO) - Fever of Unknown Origin (FUO ...

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   Jul 9, 2024 · Fever of unknown origin (FUO) is body temperature ≥ 38.3° C (≥ 101° F) rectally that does not result from transient and self-limited illness, rapidly fatal illness, or disorders with clear-cut localizing symptoms or signs or with abnormalities on common tests such as chest radiograph, urinalysis, or blood cultures.

   • Author: Larry M. Bush

7. bestpractice.bmj.com › topics › en-gbAssessment of fever of unknown origin in adults

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   Jun 25, 2024 · Fever of unknown origin (FUO) occurs across all age groups. However, age, together with epidemiological considerations, are important factors in forming a differential diagnosis. In 1961, the first formal criteria for FUO were published, based on a prospective trial.

8. People also ask

   What is a fever of unknown origin?

   • A fever of unknown origin (FUO) is a fever of at least 101°F (38.3°C) that lasts for more than three weeks or occurs frequently without explanation. Even when a doctor can’t determine the cause of the fever at first, a diagnosis is a step toward treating it. There are four classifications of FUO. Classic FUO affects previously healthy people.

   About Fever of Unknown Origin - Healthline

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   How do you know if you have a factitious fever?

   • Signs such as high temperatures without tachycardia or skin warmth or unusual fever patterns (e.g., brief spikes, loss of evening peak, absence of fever when an observer is present) should also bring the diagnosis of factitious fever to mind. 1, 2, 8, 10 It is important to confirm the presence of fever and any temporal pattern it may exhibit.

   Fever of Unknown Origin in Adults - AAFP

   www.aafp.org/pubs/afp/issues/2022/0200/p137.html

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   How many cases of fever of unknown origin are there?

   • Mansueto P, Di Lorenzo G, Rizzo M, Di Rosa S, Vitale G, Rini G, Mansueto S, Affronti M. Fever of unknown origin in a Mediterranean survey from a division of internal medicine: report of 91 cases during a 12-year-period (1991-2002). Intern Emerg Med. 2008 Sep;3(3):219-25. [PubMed]

   Fever of Unknown Origin - StatPearls - NCBI Bookshelf

   www.ncbi.nlm.nih.gov/books/NBK532265/

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   When was fever of unknown origin first diagnosed?

   • Fever of unknown origin (FUO) occurs across all age groups. However, age, together with epidemiological considerations, are important factors in forming a differential diagnosis. In 1961, the first formal criteria for FUO were published, based on a prospective trial. Petersdorf RG, Beeson PB. Fever of unexplained origin: report on 100 cases.

   Assessment of fever of unknown origin in adults

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   What causes fever of unknown origin (FUO)?

   • The causes of fever of unknown origin (FUO) are often common conditions presenting atypically. The list of causes is extensive, and it is broken down into broader categories, such as infection, noninfectious inflammatory conditions, malignancies, and miscellaneous. Noninfectious Inflammatory Causes of FUO Infectious Causes of FUO

   Fever of Unknown Origin - StatPearls - NCBI Bookshelf

   www.ncbi.nlm.nih.gov/books/NBK532265/

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9. www.nejm.org › doi › fullFever of Unknown Origin | New England Journal of Medicine

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   Feb 2, 2022 · In 1961, Petersdorf and Beeson defined fever of unknown origin (FUO) as a temperature of 38.3°C or higher for at least 3 weeks without a diagnosis, despite 1 week of inpatient investigations. 2...