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Serum or plasma substance concentration (qualitative) for a specific protein or biomarker detected by immunoassay

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

This test measures the presence or absence of a particular substance in your blood, often used to screen for conditions affecting protein levels or immune function.

Quick summary

["This test helps identify potential health issues by detecting unusual protein or biomarker levels in your blood."]

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

Key facts at a glance

LOINC
56693-5
Short code
ENA Scl70 Ab Ser Ql IB
Synonyms
ENA Scl70 Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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

This test uses an immunoassay method to detect and measure a specific substance in your serum or plasma. The exact substance may relate to proteins, antibodies, or other biomarkers, depending on clinical context. The result is qualitative (yes/no presence) rather than a quantitative measurement of concentration.

Why It Might Be Ordered

Your healthcare provider may order this test to screen for conditions such as infections, autoimmune diseases, protein disorders, or other metabolic issues. It can also help monitor treatment responses or detect early signs of disease.

Common Uses in Healthcare

This test is often used as a screening tool to check for abnormal protein levels or immune system activity. It may be part of a broader diagnostic workup for conditions like kidney disease, liver disease, or certain cancers.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The blood is then processed to separate serum (if clotted) or plasma (if anticoagulated) for testing. The test does not require fasting unless specified by your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What Does a Positive or Negative Result Mean?
A positive result means the substance was detected in your blood, which may signal an abnormality requiring further evaluation. A negative result means the substance was not detected, but this does not always rule out a condition—additional testing may be needed.
How Long Does It Take to Get Results?
Results are typically available within 1 to 3 business days, depending on lab processing times and your healthcare provider’s workflow. Follow-up instructions will be provided by your provider.
Can I Fast Before This Test?
No fasting is usually required for this test, as it involves measuring substances in your blood that are not affected by recent food intake. However, always confirm with your provider before your appointment.
  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