A diagnosis of exclusion or by exclusion (per exclusionem) is a diagnosis of a medical condition reached by a process of elimination, which may be necessary if presence cannot be established with complete confidence from history, examination or testing. Such elimination of other reasonable possibilities is a major component in performing a differential diagnosis.
Diagnosis by exclusion tends to occur where scientific knowledge is scarce, specifically where the means to verify a diagnosis by an objective method is absent. It can also commonly occur where objective diagnostic tests do exist, but extensive diagnostic testing or sufficient exploration of differential diagnosis by a multidisciplinary team is not undertaken due to financial constraints or assessment bias (health inequity).
The largest category of diagnosis by exclusion is seen among psychiatric disorders where the presence of physical or organic disease must be excluded as a prerequisite for making a functional diagnosis.
Examples
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
- Adult-onset Still's disease
- Behçet's disease
- Bell's palsy
- Burning mouth syndrome
- Chronic recurrent multifocal osteomyelitis
- Long COVID
- Inappropriate sinus tachycardia
- Psychogenic polydipsia
- Schizophrenia
- Somatic symptom disorder
- Sudden infant death syndrome
- Tolosa–Hunt syndrome
- Systemic-onset juvenile idiopathic arthritis
See also
References
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…a diagnostic dilemma unique to mental disorders. Unlike somatic disorders, mental disorders cannot be detected by genetic, neuronal, or physiological correlates.
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