Delirium laboratory findings

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sara Zand, M.D.[2] Pratik Bahekar, MBBS [3]; Vishal Khurana, M.B.B.S., M.D. [4]

Laboratory findings may differ according to the etiology of delirium. Following investigations are done in delirium: pulse oximetry, electrolytes, blood glucose, liver function tests, blood urea nitrogen, creatinine, vitamin B12 , Folate levels, measurement therapeutic drug levels, urine drug screen for substance use, blood alcohol level, complete blood count, urinalysis, thyroid function testing, erythrocyte sedimentation rate, C-reactive protein, rapid plasma reagin screening for syphilis, acquired immune deficiency syndrome/human immunodeficiency virus (AIDS/HIV) screening.

There are no specific laboratory findings associated with delirium. Common laboratory tests for delirium include:^[1]

• Pulse oximetry
• Electrolytes, blood glucose, liver function tests, blood urea nitrogen, creatinine
• Vitamin B12 , Folate levels
• Measurement therapeutic drug levels
• Urine drug screen for substance use
• Blood alcohol level
• Complete blood count
• Urinalysis
• Thyroid function testing
• Erythrocyte sedimentation rate, C-reactive protein
• Rapid plasma reagin screening for syphilis
• Acquired immune deficiency syndrome/human immunodeficiency virus (AIDS/HIV) screening

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