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Acetylsalicylate (Aspirin) Level in Plasma

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

This test measures the amount of acetylsalicylate (the active form of aspirin) in your blood plasma to check how much of the medication is currently in your system.

Quick summary

This helps doctors monitor your aspirin dose to ensure it’s at the right level for your condition.

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

Key facts at a glance

LOINC
73519-1
Short code
Acetylsalicylate ind plt IgM SerPl Ql FC
Synonyms
Acetylsalicylate ind plt IgM SerPl Ql FC
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Critical range
— – 50 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

Doctors may order this test if you’re taking aspirin for conditions like heart disease, pain, or inflammation. It helps prevent overdosing or underdosing, especially if you’re on long-term treatment or have kidney issues.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw a blood sample. It usually takes a few minutes, and you may feel a brief pinch.

What the Results Mean

Results are compared to a general reference range, but exact values can vary by lab. High levels may indicate overdose, while low levels could mean the medication isn’t working as intended.

Common Reasons for Testing

This test is often done if you’re on high-dose aspirin (e.g., 325 mg or more daily), have kidney problems, or experience side effects like stomach upset or bleeding.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Aspirin Level

Frequently asked questions

What does a high acetylsalicylate level mean?
High levels may suggest an overdose, which can cause nausea, ringing in the ears, or even serious complications like low blood pressure or stomach bleeding. Your doctor will adjust your dose or treatment if needed.
What does a low acetylsalicylate level mean?
Low levels might mean your body is breaking down aspirin too quickly, or you’re not taking it as prescribed. Your doctor may recommend checking your adherence or adjusting your medication.
Can diet or other medications affect this test?
Yes, certain foods (like grapefruit) or other drugs (e.g., blood thinners) can interact with aspirin. Always tell your doctor about all medications, supplements, or recent diet changes.
  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