Skip to content

Serum or Plasma Mass Concentration of Neopterin

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

This test measures the amount of neopterin, a chemical produced when your immune system responds to infections, inflammation, or certain conditions like cancer.

Quick summary

["Neopterin helps assess immune activation and underlying health risks."]

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

Key facts at a glance

LOINC
86136-9
Short code
S pneum Da 6A IgG Ser-mCnc
Synonyms
S pneum Da 6A IgG Ser-mCnc
Category
coagulation
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 Is This Test Done?

Your doctor may order this test to check for immune system activity, monitor conditions like infections, autoimmune diseases, or cancer, or evaluate responses to treatments.

What Does a High or Low Level Mean?

Elevated neopterin often signals immune activation, which can occur with infections, inflammation, or conditions like HIV, cancer, or autoimmune disorders. Lower levels may suggest suppressed immune activity or certain metabolic conditions.

How Is the Sample Collected?

A blood sample is drawn from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause significant discomfort. The sample is sent to a lab for testing.

What Should You Expect Before the Test?

No special preparation is needed, but avoid strenuous activity 24 hours before the test. If you’re on medications, tell your doctor before the procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Neopterin serves as a biomarker for immune activation. Elevated levels are commonly associated with chronic infections, malignancies, or inflammatory diseases, while lower levels may indicate immune suppression or specific metabolic conditions. It’s often used in conjunction with other tests for diagnostic support.

Short name

Neopterin Level

Frequently asked questions

What causes neopterin levels to rise?
Neopterin levels can rise due to infections (like viral or bacterial), autoimmune diseases (such as lupus or rheumatoid arthritis), certain cancers, or immune system overactivity. Chronic stress or inflammation may also contribute.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your doctor will discuss the findings with you.
Can lifestyle changes affect neopterin levels?
While diet and exercise may influence overall immune function, neopterin levels are primarily tied to immune system activity. Your doctor will interpret results in the context of your health status.
  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