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Serum/plasma concentration of ondansetron (antiemetic drug)

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of ondansetron, a medication used to prevent nausea and vomiting, in your blood.

Quick summary

["Ondansetron levels help doctors check if your medication dose is working properly."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
73230-5
Short code
Ondansetron ind plt IgM SerPl Ql FC
Synonyms
Ondansetron ind plt IgM SerPl Ql FC
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
17
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 healthcare provider may order this test if you’re taking ondansetron long-term, experiencing side effects, or if you’re being monitored for drug levels in certain situations, such as after surgery or chemotherapy.

What to Expect Before the Test

No special preparation is needed. You may have blood drawn from a vein in your arm, similar to other blood tests. If you’re on a blood thinner, let your provider know before the test.

What the Test Results Mean

Results help determine if your ondansetron dose is therapeutic (effective) or if adjustments are needed. Abnormal levels may indicate issues like poor absorption, drug interactions, or kidney problems.

Common Reasons for Testing

This test is often used in patients undergoing chemotherapy, radiation therapy, or post-operative recovery to manage nausea and vomiting effectively.

Reference range

NCBI: NSE 0-17 ng/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Ondansetron Levels Play a Role in Personalizing Treatment

Short name

Ondansetron Level

Frequently asked questions

What Are My Blood Test Results?
Compare your results with your healthcare provider’s guidance. They’ll interpret the value in the context of your medical history, current symptoms, and other medications you’re taking.
Will I Need to Avoid Certain Foods or Drinks Before the Test?
No dietary restrictions apply unless specified by your provider. However, inform them about any medications or supplements you’re taking to avoid potential interactions.
How Long Will It Take to Get My Results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Follow-up with your provider if they request additional testing or adjustments.
  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 17, 2026. · Read our editorial policy