How Is Anorexia Nervosa Diagnosed? Tests, Criteria & Process
Anorexia Nervosa diagnosis relies on Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis. Learn the full diagnostic pathway, clinical criteria, differential workup, and what to expect at your evaluation.
Updated March 27, 2026
Anorexia Nervosa is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Anorexia nervosa is an eating disorder with severe food restriction, intense fear of weight gain, and distorted body image. It has the highest mortality rate of any psychiatric disorder; multidisciplinary treatment including nutritional rehabilitation and psychotherapy is essential.
Clinical Context
The diagnostic process for Anorexia Nervosa begins with Thorough history and physical examination followed by basic blood and urine tests; targeted specialist investigation as needed. Key investigations include Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis, Chest X-ray. The gold standard is: Directed investigation based on clinical history and physical examination findings. Clinical guidelines from NICE / BMJ Best Practice / WHO define the diagnostic criteria and recommended investigation pathway.
Clinical Pathway
Anorexia Nervosa — Full Condition GuideCondition HubAnorexia Nervosa — Differential DiagnosisDifferentialAnorexia Nervosa — Treatment PathwaysTreatmentAnorexia Nervosa — Prognosis & OutlookPrognosisFrequently Asked Questions
How Is Anorexia Nervosa Diagnosed? Tests, Criteria & Process?+
Anorexia Nervosa is diagnosed using Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis and targeted clinical evaluation. Anorexia nervosa is an eating disorder with severe food restriction, intense fear of weight gain, and distorted body image. It has the highest mortality rate of any psychiatric disorder; multidisciplinary treatment including nutritional rehabilitation and psychotherapy is essential.
How do doctors test for anorexia nervosa?+
The main tests used to diagnose Anorexia Nervosa include Full blood count (FBC), Comprehensive metabolic panel (electrolytes, creatinine, LFTs), Urinalysis. Your doctor will select investigations based on your symptoms, clinical findings, and risk factors.
How long does it take to diagnose Anorexia Nervosa?+
The time to diagnosis varies. Some cases are identified within hours using clinical presentation and blood tests; others require weeks, repeated investigations, or specialist referral.
Can Anorexia Nervosa be missed on initial testing?+
Yes — Anorexia Nervosa can be missed if initial tests are negative or if the presentation is atypical. If clinical suspicion remains high, repeat testing or specialist referral is appropriate.
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