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Serum Olanzapine Concentration (Quantitative)

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

This test measures the amount of olanzapine, a medication used to treat certain mental health conditions, in your blood serum.

Quick summary

["Helps monitor drug levels for safety and effectiveness."]

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

Key facts at a glance

LOINC
72983-0
Short code
OLANZapine (neut) IgM SerPl Ql FC
Synonyms
OLANZapine (neut) IgM 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 healthcare provider may order this test if you’re taking olanzapine to check if your dose is working properly or if you’re experiencing side effects. It’s especially important for long-term use to ensure safe blood levels.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test is quick and typically done in a lab setting.

What the Results Mean

Results show your current olanzapine concentration. While reference ranges vary by lab, they help guide whether your dose is therapeutic or if adjustments are needed.

Common Reasons for Testing

This test may be done during treatment to avoid high levels (which can cause dizziness, weight gain, or other side effects) or low levels (which may reduce effectiveness).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Olanzapine Levels Matter

Short name

Olanzapine Level

Frequently asked questions

Olanzapine is a potent medication, and blood levels can fluctuate. Unusually high or low levels may affect how well it works or increase risks like dizziness, weight changes, or metabolic issues.
Is this test covered by insurance? Your insurance plan may cover it if prescribed for your condition, but confirm with your provider.
Will I need to fast before this test? No fasting is required for this blood draw.
What are typical side effects of olanzapine? Common ones include drowsiness, weight gain, or dry mouth. High levels may worsen these effects.
How often should I get this test? Your doctor will determine timing based on your treatment plan and symptoms.
What if my results are outside the expected range? Your provider will discuss findings with you and may adjust your dose or monitor more closely.
  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