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Serum/plasma concentration of haloperidol (antipsychotic medication)

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

This test measures the amount of the antipsychotic drug haloperidol in your blood or plasma. It helps your healthcare provider check if your dose is working properly and if you’re experiencing side effects.

Quick summary

["This test helps ensure your haloperidol dose is safe and effective."]

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

Key facts at a glance

LOINC
73357-6
Short code
Haloperidol ind plt IgM SerPl Ql FC
Synonyms
Haloperidol 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 if you’re taking haloperidol to manage conditions like schizophrenia, bipolar disorder, or severe agitation. It helps monitor drug levels to prevent low or high concentrations that could affect your health.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw blood. If done via plasma, it may be collected from an IV line. The process is quick and usually painless.

What the Results Mean

Results show your current haloperidol levels. Low levels may mean your dose isn’t strong enough, while very high levels could indicate side effects like dizziness, rapid heartbeat, or confusion. Your doctor will interpret these results in the context of your medical history and symptoms.

Common Side Effects to Watch For

High or low haloperidol levels can cause side effects like dizziness, muscle stiffness, or unusual movements. If you notice these symptoms, contact your doctor right away.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Haloperidol Level

Frequently asked questions

Why was this test ordered?
Your doctor may have ordered this test to check if your haloperidol dose is appropriate, to monitor for side effects, or to ensure the drug is working as intended in your treatment plan.
What does a normal range mean for this test?
There’s no single ‘normal’ range for haloperidol levels because they depend on your dose, metabolism, and medical condition. Your doctor will use your specific results along with your symptoms to guide care.
Can I eat or drink before this test?
You can eat and drink normally unless your doctor specifies otherwise. No fasting is required for this blood test.
  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