Skip to content

Serum or plasma concentration of a substance measured by immunoassay (e.g., a protein or hormone)

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

This test measures the amount of a specific substance in your blood, often used to check for infections, immune responses, or other health conditions.

Quick summary

["Helps diagnose and monitor conditions by detecting abnormal levels of certain proteins or chemicals in your blood."]

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

Key facts at a glance

LOINC
50071-0
Short code
11DC Amn-sCnc
Synonyms
11DC Amn-sCnc
Category
hormone
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test to evaluate your body’s response to illness, detect hidden infections, or assess how well your organs or systems are functioning. It can also help monitor treatments for conditions like autoimmune diseases, infections, or metabolic disorders.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for a few hours if your test involves a specific analyte (e.g., hormones). Bring any medications or supplements you’re taking to your appointment.

During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but the procedure usually takes just a few minutes. If you’re nervous, let your provider know—they can take steps to make it more comfortable.

What the Results Mean

Results will show whether your substance levels are within expected ranges or outside them. High or low levels may signal underlying health issues, but your provider will interpret them in the context of your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Substance concentration (serum/plasma)

Frequently asked questions

How long does it take to get my test results?
Results are typically available within 1–3 business days, depending on the lab and test complexity. Some providers may request follow-up testing for confirmation.
Can I eat or drink before this test?
Check with your provider—some tests require fasting, while others do not. If unsure, ask about any restrictions for your specific test.
What if my test results are abnormal?
If results are outside normal ranges, your provider will explain what it means and may recommend further testing or adjustments to your treatment plan. Never interpret results independently—always discuss them with a healthcare professional.
  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