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Nonspecific Substance in Serum (Qualitative) – Antibody Screening

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

This test checks for the presence of certain antibodies in your blood serum, which may indicate an immune response to infection, autoimmune conditions, or other health concerns.

Quick summary

["This screening helps identify potential immune system activity that may require further evaluation."]

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

Key facts at a glance

LOINC
8030-9
Short code
S pneum Ab Ser Ql
Synonyms
S pneum Ab Ser Ql
Category
coagulation
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

What This Test Measures

The test detects antibodies in your serum, which are proteins produced by your immune system in response to foreign substances (antigens). This can include antibodies from infections, autoimmune reactions, or other immune responses. The method used is typically an immunoassay, which detects the presence of these antibodies without specifying which ones.

Why It Might Be Ordered

Your healthcare provider may order this test if you have symptoms like fatigue, fever, joint pain, or unexplained infections. It could also be part of routine screening for conditions like lupus, rheumatoid arthritis, or infections like HIV or hepatitis.

When to Expect Results

Results are usually available within a few days to a week, depending on lab processing times. Follow-up with your doctor to discuss next steps if the test is positive or abnormal.

Common Reasons for Testing

This test is often used as a preliminary screening tool to identify possible immune-related issues. It does not provide detailed information about the specific cause of your symptoms but can guide further diagnostic testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Antibody Screen (Qualitative)

Frequently asked questions

What does a positive result mean?
A positive result means antibodies were detected in your blood, which could indicate an immune response to infection, an autoimmune condition, or another health issue. Your doctor will discuss next steps, such as further testing or monitoring.
Can I fast before this test?
No fasting is required for this test, as it involves a simple blood draw. However, always follow your healthcare provider’s instructions for any specific preparations.
How long does it take to get results?
Results are typically available within 1 to 7 business days, depending on lab workflows. Your doctor will contact you once they are ready.
  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