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Quetiapine Concentration in Plasma (Serum)

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

This test measures the amount of quetiapine, a medication used to treat mental health conditions like depression, anxiety, or bipolar disorder, in your blood plasma or serum.

Quick summary

["Understanding your quetiapine levels helps your healthcare provider adjust your dose for better treatment effectiveness and safety."]

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

Key facts at a glance

LOINC
73182-8
Short code
QUEtiapine ind plt IgM SerPl Ql FC
Synonyms
QUEtiapine 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 doctor may order this test to monitor your response to quetiapine, check for side effects, or ensure the medication is working properly in your body. It’s often done when you start a new dose, adjust your dose, or if you’re 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 a blood sample. If you’re taking quetiapine orally, you can eat and drink as usual before the test.

What the Test Results Mean

The results will show the concentration of quetiapine in your blood. While there’s no single ‘normal’ range for everyone, your doctor will compare your results to your treatment plan and any previous tests to guide your care.

Possible Side Effects and Monitoring

Quetiapine can cause side effects like drowsiness, dizziness, or weight changes. High or low levels might indicate issues with how your body processes the medication, so consistent monitoring helps prevent problems.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Quetiapine Level

Frequently asked questions

How often should I expect this test?
Your doctor will determine the frequency based on your treatment plan. Some patients may need testing weekly or monthly, especially during dose adjustments.
Can I stop taking quetiapine if my test results are high?
Never stop taking quetiapine without consulting your doctor. High levels can be dangerous, and your doctor will work with you to adjust your dose safely.
What if my results are lower than expected?
Lower-than-expected levels might mean your body is processing quetiapine too quickly. Your doctor may increase your dose or check for other factors affecting your medication, like liver function or interactions with other drugs.
  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