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Serum/plasma concentration of citalopram (selective serotonin reuptake inhibitor)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of citalopram, a medication used to treat depression, anxiety, and other mood-related conditions, in your blood.

Quick summary

["Understanding your medication levels helps ensure your dose is effective and safe."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
73442-6
Short code
Citalopram ind plt IgM SerPl Ql FC
Synonyms
Citalopram ind plt IgM SerPl Ql FC
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you’re taking citalopram long-term, experiencing side effects, or if you’re adjusting your dose. It helps monitor whether your medication is working properly and if your body is handling it well.

What to Expect Before the Test

No special preparation is needed. You’ll typically have a small needle inserted into your arm or vein to draw blood. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results are compared to a general reference range for citalopram in blood, but individual ranges can vary. Low levels may indicate insufficient medication, while very high levels could signal potential toxicity or improper metabolism.

Common Side Effects to Watch For

While rare, high citalopram levels might be linked to side effects like nausea, dizziness, or unusual fatigue. Always report any concerning symptoms to your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Monitoring Medication Levels

Short name

Citalopram Level

Frequently asked questions

How often is this test typically done?
This test is usually done when you first start taking citalopram, after dose adjustments, or if you experience unusual symptoms. Your provider will determine the frequency based on your treatment plan.
Can diet or other medications affect this test?
Yes, certain foods, supplements, or other medications (like grapefruit juice or some antidepressants) can interact with citalopram. Always inform your provider about all medications and supplements you take.
What if my results are outside the expected range?
If your results are unusually high or low, your provider will review them with you and may adjust your medication, dosage, or treatment plan accordingly.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy