Serum/plasma concentration of citalopram (antidepressant medication)

Why This Test Is Done

Your doctor may order this test if you’re taking citalopram to manage depression, anxiety, or other conditions. It helps ensure the medication is at an effective level in your body without causing harmful side effects. This is especially important if you’ve recently started the medication, changed your dose, or are experiencing unusual symptoms.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into your arm or vein to draw blood. If you’re taking citalopram by mouth, you can continue your usual medications unless instructed otherwise. Avoid eating or drinking for a short time before the test if your lab requires fasting.

What Happens During the Test

A healthcare professional will collect a blood sample from a vein in your arm. The sample is then sent to a lab for analysis. The test typically takes a few minutes, and you may feel a brief pinch or discomfort during the needle insertion.

What the Results Mean

Results are compared to your individual baseline or clinical guidelines to determine if your dose is appropriate. Low levels may indicate the medication isn’t working as intended, while high levels could signal toxicity or improper metabolism. Your doctor will discuss these findings with you during your follow-up visit.