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Serum/plasma Substance Concentration (General Protein or Peptide Marker) by Immunoassay

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

This test measures the amount of a specific protein or peptide in your blood, often used to assess protein levels, immune function, or metabolic processes.

Quick summary

["This test helps doctors evaluate protein-related health concerns."]

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

Key facts at a glance

LOINC
101745-8
Short code
DPPX Ab Ser Ql CBA IFA
Synonyms
DPPX Ab Ser Ql CBA IFA
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cba-ifa
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 healthcare provider may order this test to check for conditions affecting protein production, breakdown, or function. It could be used to monitor diseases like kidney problems, liver issues, or certain infections, or to evaluate how well treatments are working.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it involves a blood draw, but this depends on the specific test instructions from your provider. Bring any medications or supplements you’re taking to your appointment.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm. The blood sample is then sent to a lab for analysis using an immunoassay method to detect and measure the protein or peptide in question.

What the Results Mean

Results are compared to a reference range, which varies by protein/peptide type. High or low levels may signal underlying health issues, such as protein loss, immune disorders, or metabolic imbalances. Your provider will discuss the results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

What could abnormal results indicate?
Elevated levels might suggest conditions like inflammation, certain cancers, or kidney/liver disease. Low levels could indicate malnutrition, liver dysfunction, or genetic disorders affecting protein synthesis. Always consult your provider for interpretation.
How often should I get this test?
Frequency depends on your health status and treatment plan. Your provider will determine if regular monitoring is needed, such as for chronic conditions like kidney disease or diabetes.
Can I eat or drink before this test?
Follow your provider’s instructions—some tests require fasting, while others do not. If unsure, ask your lab or healthcare team 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