Table 3. Tests That May Be Indicated as Part of a Psychiatric Evaluation| Test | Notes |
|---|
| Basic lab tests (e.g., complete blood count; blood
chemistries, including lipid profile, B12,
folate; urinalysis) | Used to screen for general medical conditions or provide baseline
measures prior to treatment. Recommended frequency of screening
may vary with health status and with specific ongoing treatments
(e.g., second-generation antipsychotics, lithium). |
| Medication levels | Used to monitor therapeutic levels of medications. |
| Pregnancy test | Some psychiatric conditions and treatments may entail
risks to a pregnant woman or her fetus. |
| Fasting blood glucose or hemoglobin A1c | Used to diagnose diabetes or help determine risk. Patients prescribed
second-generation antipsychotics may be at increased risk of developing
diabetes. |
| Lyme serology, syphilis serology, HIV test | May assist in evaluation of cognitive and behavioral changes.
Individuals with behavioral problems such as impulsivity or drug
use may be at increased risk for HIV infection. |
| Thyroid function tests | May be important for patients with suspected mood disorder, anxiety
disorder, or dementia. Used to monitor lithium effects. |
| Toxicology screen, blood alcohol level | Used to screen for substance use or abuse. Individuals
with a mental disorder are at increased risk for substance abuse. |
| Lumbar puncture | Used to diagnose central nervous system infection (e.g., meningitis,
herpes, toxoplasmosis, syphilis, Lyme disease). May be important
for differential diagnosis of delirium. |
| Electrocardiogram | Used to assess effects of medications that may influence cardiac
conduction (e.g., tricyclic antidepressants, some antipsychotics).
May also be indicated depending on age and health status. |
| Chest X ray | Used to diagnose cardiopulmonary disorders (e.g., pneumonia,
tuberculosis) that may contribute to delirium. May also be part
of a pre-ECT evaluation depending on age and health status. |
| Imaging studies | Structural (e.g., CT, MRI) and functional
(e.g., PET, SPECT, EEG, fMRI) studies
may indicate regional brain abnormalities related to a psychiatric
illness and its management. |
| Polysomnography | Used to diagnose sleep disorders, including sleep apnea. May
be important for differential diagnosis of depression, psychosis,
or other cognitive or behavioral changes. |
| Psychological testing | May be requested when cognitive deficits are suspected
or there is need to grade for severity or progression of symptoms
over time. May also be helpful in establishing a diagnosis (e.g.,
dementia, mental retardation) or in delineating specific deficits
that affect thought processes, treatment, or vocational planning. |