Serum or Plasma Substance Concentration by Immunoassay (General Protein or Antibody)
This test measures the amount of a specific protein or antibody in your blood, either in serum or plasma. It helps diagnose or monitor conditions related to immune function, inflammation, or other metabolic processes.
["Assists doctors in identifying or tracking conditions affecting protein levels in your blood."]
Key facts at a glance
- LOINC
- 23437-7
- Short code
- SIV Ab Ser Ql
- Synonyms
- SIV Ab Ser Ql
- Category
- chemistry
- 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
This test detects a particular protein or antibody in your blood using an immunoassay method. Immunoassays are highly sensitive and can identify very small amounts of substances. The test may be used to measure proteins like immunoglobulins (antibodies), enzymes, hormones, or other biomarkers relevant to your health condition.
Common Uses for This Test
Doctors may order this test to diagnose or manage conditions such as infections, autoimmune diseases, kidney or liver disorders, or to check for certain types of cancers. It can also help monitor treatment responses or track disease progression.
How the Test Is Performed
A blood sample is drawn from a vein, typically in your arm. The blood is then processed to separate serum or plasma from cells. The sample is sent to a lab where it is analyzed using an immunoassay technique to measure the concentration of the specific protein or antibody.
What to Expect Before the Test
No special preparation is usually needed, but you may be asked to fast for a few hours if your doctor specifies a fasting test. Avoid smoking or consuming certain medications for the recommended time before the test. Inform your doctor about any medications you’re taking, as they may affect results.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal levels of proteins or antibodies can indicate underlying health issues. For example, elevated antibody levels might suggest an immune response to infection or an autoimmune condition. Low levels could point to deficiencies, organ dysfunction, or other metabolic disorders. Your doctor will interpret the results in the context of your symptoms and medical history.
Short name
Serum/Plasma Protein or Antibody Level
Frequently asked questions
Why might my doctor order this test?
What do my test results mean?
Can lifestyle or diet affect this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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