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Risperidone Concentration in Plasma

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

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

Quick summary

["Understanding your risperidone blood level helps your doctor monitor your treatment."]

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

Key facts at a glance

LOINC
73162-0
Short code
risperiDONE ind plt IgM SerPl Ql FC
Synonyms
risperiDONE 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 Is This Test Done?

Your doctor may order this test to check if your risperidone levels are within the recommended range. This helps ensure the medication is working effectively and safely for your condition, such as schizophrenia or bipolar disorder.

What Does This Test Involve?

A blood sample is taken from a vein in your arm. The blood is then processed to separate the plasma, which is sent to a lab for testing using a specialized immunoassay method.

What Should You Expect Before the Test?

You can eat and drink normally before the test, but avoid smoking right before your blood draw. Wear loose clothing and an extra shirt if needed for easy access to your arm.

What Are the Possible Results?

Results are typically reported as a concentration value in nanograms per milliliter (ng/mL). Your doctor will interpret these results in relation to your specific treatment plan and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Risperidone levels are critical because they help prevent side effects like excessive sedation, weight gain, or metabolic issues. Too low levels may indicate the medication isn’t working properly, while too high levels could pose risks.

Short name

Risperidone Level

Frequently asked questions

How often will I need this test?
The frequency depends on your treatment plan. Some patients need this test weekly or biweekly during initial titration, while others may only need it monthly or as needed for adjustments.
What if my results are outside the expected range?
If your risperidone level is too high or too low, your doctor may adjust your dosage. They’ll discuss this with you and may recommend further testing or changes to your treatment plan.
Does this test affect my medication?
No, this test does not change your medication. It simply provides data to help your doctor optimize your treatment. Always follow your doctor’s instructions for taking risperidone.
  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