Laboratory Workup for New Acute Mania to Rule Out Organic Causes

Risk Stratification Determines Testing Intensity

The American College of Emergency Physicians recommends a targeted laboratory workup guided by history, physical examination, and risk factors for patients presenting with new acute mania, with essential tests including glucose, electrolytes, thyroid function, toxicology screen, and CBC when clinically indicated 1, 2, 3, 4
High-risk patients, including those with age >65 years, require more extensive evaluation 2, 4
Patients with no prior psychiatric history require a thorough workup 1, 4
Substance abuse history is a significant risk factor for organic causes of mania 2, 4

Serum glucose should be checked as hypoglycemia and hyperglycemia can present with manic symptoms 5, 6
Thyroid function tests (TSH, free T4) should be performed as primary hypothyroidism can cause acute mania 9
Comprehensive metabolic panel including electrolytes should be ordered to check for hyponatremia and other electrolyte imbalances 5, 6
Toxicology screen (urine and serum) should be performed as 30% of new psychiatric presentations have toxicologic etiologies 1, 2

Brain imaging is not routinely indicated for uncomplicated new-onset mania without neurological findings 8, 7
CT head (or MRI if stable) should be obtained when focal neurological deficits are present, or there is a history of head trauma 8, 7

History and physical examination can identify 94% of organic causes, making them more valuable than reflexive laboratory ordering 3, 4
Routine extensive laboratory panels have an extremely low yield, with only 0.8-1.4% of routine screening tests contributing meaningfully to diagnosis or treatment 2, 3

Electroencephalogram (EEG) should be considered if seizure activity is suspected 9
Lumbar puncture with CSF analysis should be performed if CNS infection is suspected (fever, immunocompromised) 9, 5