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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. It helps your healthcare provider check if your dose is working properly and if you’re experiencing any side effects.

Quick summary

["This test helps monitor your antipsychotic medication levels and adjust your treatment safely."]

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

Key facts at a glance

LOINC
73356-8
Short code
Haloperidol ind plt IgG SerPl Ql FC
Synonyms
Haloperidol ind plt IgG 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 if you’re taking haloperidol to manage conditions like schizophrenia, bipolar disorder, or severe agitation. It helps ensure you’re getting the right dose and avoids dangerous levels that could cause side effects like dizziness, rapid heart rate, or movement disorders.

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. It usually takes a few minutes. If you’re on a long-term medication like haloperidol, your doctor may check this level periodically.

What the Test Results Mean

Results are compared to your individual baseline or clinical guidelines. Too much or too little can affect how your body responds to the drug. Your doctor will discuss the results with you and adjust your treatment if needed.

Common Reasons for Testing

Your doctor might order this test if you’re experiencing symptoms like unusual movements, high blood pressure, or confusion—possible signs of abnormal drug levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Haloperidol Level

Frequently asked questions

Why might my doctor want to check my haloperidol level more often?
If you’re new to haloperidol, have kidney or liver issues, take other medications that interact with it, or are elderly, your doctor may check levels more frequently to avoid complications.
What should I do if I feel dizzy, have a fast heartbeat, or notice unusual movements after taking haloperidol?
Contact your doctor immediately. These could be signs of dangerous drug levels. Never adjust your dose yourself—always follow your healthcare provider’s instructions.
Can I drink alcohol before this test?
It’s best to avoid alcohol before testing, as it may affect your blood levels and could interfere with the test results. Always follow your doctor’s specific instructions.
  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