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Procaïnamide (N-acetylprocainamide) concentration in serum/plasma

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

This test measures the amount of procainamide and its active metabolite, N-acetylprocainamide, in your blood. These substances are involved in treating certain types of heart rhythm disorders.

Quick summary

["This test helps monitor drug levels to ensure safe and effective treatment for arrhythmias."]

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

Key facts at a glance

LOINC
3983-4
Short code
Procainamide+NAPA SerPl-mCnc
Synonyms
Procainamide+NAPA SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 procainamide or its related medications to manage irregular heartbeats (arrhythmias). It helps assess whether your medication levels are within a safe range to prevent side effects or reduce the risk of recurrence.

What to Expect Before the Test

No special preparation is typically needed. You may have a small needle inserted into a vein (usually in your arm) to draw blood. If you’re on anticoagulants, inform your provider beforehand.

What the Test Results Mean

Results are used to adjust your medication dose if needed. Abnormal levels may indicate toxicity (too much drug) or insufficient effectiveness (too little drug). Your provider will interpret results in the context of your overall health and symptoms.

Possible Side Effects or Risks

While rare, blood tests can cause mild discomfort or bruising at the injection site. Overdoses of procainamide may lead to dizziness, nausea, or heart rhythm changes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Procainamide (N-acetylprocainamide) level

Frequently asked questions

What conditions or symptoms might trigger this test?
This test is primarily used to monitor patients on procainamide therapy for arrhythmias, such as ventricular arrhythmias or Wolff-Parkinson-White syndrome, to ensure therapeutic drug levels are maintained.
How often will I need this test?
Frequency depends on your medication regimen, health status, and provider instructions. Some patients may need testing weekly or monthly to adjust doses safely.
Can I eat or drink before this test?
You can typically eat and drink normally unless your provider specifies otherwise. Avoid alcohol or caffeine before the test if instructed.
  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