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Serum/plasma free salicylic acid concentration (mass concentration)

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

This test measures the amount of salicylic acid (a pain reliever and fever reducer) that is not bound to proteins in your blood.

Quick summary

["Salicylate levels help assess drug safety and detect potential toxicity from overuse of salicylates."]

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

Key facts at a glance

LOINC
12725-8
Short code
SIgA SerPl-aCnc
Synonyms
SIgA SerPl-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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’ve taken salicylate medications (like aspirin or some over-the-counter pain relievers) and have symptoms like nausea, ringing in the ears, or confusion. It’s also used in monitoring patients who’ve ingested large amounts of salicylates, such as in poisoning cases.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. If you’re on salicylate medications, tell your healthcare provider before the test.

What the Results Mean

High levels may indicate overdose or improper metabolism, while very low levels could suggest poor absorption or liver/kidney issues. Your doctor will interpret results in the context of your symptoms and medication use.

Common Causes of Abnormal Results

Elevated salicylate levels can result from excessive ingestion, liver disease, or kidney problems. Low levels may occur with liver dysfunction or rapid metabolism.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Free Salicylate Level

Frequently asked questions

What symptoms might I experience if my salicylate level is too high?
High salicylate levels can cause symptoms like vomiting, dizziness, hearing loss, or even seizures in severe cases. Your doctor will monitor you closely if levels are elevated.
Can I stop taking salicylates if my test shows normal levels?
Not necessarily. Your doctor will consider your overall health, other medications, and symptoms before deciding whether to adjust your dose. Always follow their guidance.
How often should I get this test?
Your doctor will determine the timing based on your treatment plan, symptoms, and medical history. Regular monitoring may be needed if you’re taking salicylates long-term.
  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