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Serum/Plasma Concentration of Citalopram (Serotonin Reuptake Inhibitor)

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

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

Quick summary

["Knowing your medication levels helps your doctor adjust your dose for better effectiveness and safety."]

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

Key facts at a glance

LOINC
73036-6
Short code
Citalopram (neut) IgG SerPl Ql FC
Synonyms
Citalopram (neut) IgG SerPl Ql FC
Category
chemistry
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 doctor may order this test if you’re taking citalopram to check if your dose is working properly or if you’re experiencing side effects. It can also help monitor long-term use or if you’re switching medications.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. If you’re on a low sodium diet or have certain medications, your doctor may instruct you to adjust your routine beforehand.

What the Test Results Mean

Results show how much citalopram is in your blood at the time of testing. Low levels may mean your dose isn’t strong enough, while very high levels could indicate side effects or improper metabolism.

Common Reasons for Testing

Doctors may test citalopram levels if you’re struggling with symptoms, have side effects like nausea or fatigue, or if you’re taking other medications that could affect how citalopram works in your body.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal levels can affect how well the medication works. Low levels might require a higher dose, while high levels could signal toxicity or the need for dose adjustments. This test helps balance safety and effectiveness.

Short name

Citalopram Level

Frequently asked questions

Why do doctors check citalopram levels?
Doctors check citalopram levels to ensure your medication is at an optimal dose for treating depression or anxiety without causing harmful side effects.
What happens if my citalopram level is too high?
High levels may cause symptoms like dizziness, nausea, or confusion. Your doctor will adjust your dose or monitor you closely until levels return to a safe range.
Can food or other medications affect this test?
Yes, certain foods, supplements, or other medications (like grapefruit juice or certain antibiotics) can change how citalopram is processed in your body, potentially affecting test results.
  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