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Salicylate Level (Serum or Plasma)

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

This test measures the amount of salicylate, a compound found in aspirin, in your blood. It helps assess exposure to aspirin or other salicylate-containing medications.

Quick summary

["Knowing your salicylate level helps doctors monitor potential toxicity from aspirin use."]

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

Key facts at a glance

LOINC
29352-2
Short code
Salicylates Gast-mCnc
Synonyms
Salicylates Gast-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 50 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
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’ve taken high doses of aspirin or other salicylates (like some pain relievers or medications for arthritis). It’s also used in cases of suspected poisoning, unexplained symptoms like nausea, ringing in the ears, or confusion, or if you’re taking salicylates for a long time.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. If you’re concerned about discomfort, let your provider know.

What the Test Results Mean

Results are compared to a general reference range, but exact values can vary by lab. High levels may indicate overdose or improper metabolism, while low levels suggest insufficient exposure.

Common Symptoms of Salicylate Toxicity

High salicylate levels can cause symptoms like tinnitus (ringing in ears), headache, vomiting, dizziness, or difficulty breathing. Seek immediate medical attention if these occur.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Salicylate Test

Frequently asked questions

What does a salicylate level tell your doctor?
It helps determine if you’ve had too much aspirin or salicylate-containing medication, whether you need dose adjustments, or if you’re at risk for complications like kidney damage or bleeding disorders.
How is this test different from other blood tests?
Unlike general blood tests (like glucose or electrolytes), this test specifically measures salicylate, a medication-related compound, often using advanced methods like chromatography or immunoassay.
Can I drink water before this test?
Yes, you can drink water unless your provider specifies otherwise. Avoid caffeine or alcohol before the test, as they may affect test results.
  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