Serum or plasma concentration of a substance measured by immunoassay (e.g., tetramethylbenzidine-based chemiluminescent immunoassay)
This test measures the concentration of a specific substance in your blood, often used to detect or monitor certain conditions. The method involves a sensitive chemical reaction that produces light for detection.
["This test helps identify or track levels of a particular protein or marker in your blood, aiding in diagnosis or management of health conditions."]
Key facts at a glance
- LOINC
- 9981-2
- Short code
- QRS T-Amp L-V3
- Synonyms
- QRS T-Amp L-V3
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ekg
- 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 the presence and amount of a specific substance in your serum or plasma. The test uses a highly sensitive chemical process (chemiluminescence) to quantify the analyte. The result reflects how much of this substance is circulating in your bloodstream.
Why It’s Ordered
Your healthcare provider may order this test to diagnose or monitor conditions related to abnormal levels of the measured substance. It can help assess conditions like infections, autoimmune disorders, or metabolic issues where this substance plays a role.
Common Uses
This test is often used in screening, confirmation, or monitoring for conditions where the substance is elevated or altered. It may be part of a broader panel or used independently based on clinical suspicion.
Sample Collection and Preparation
A blood sample is collected from a vein, typically in the arm. The blood is processed to separate serum or plasma for testing. This process ensures the test measures the correct fluid component of your blood.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal levels of this substance can indicate underlying health issues. For example, elevated levels might suggest inflammation, infection, or other systemic conditions. Your healthcare provider will interpret the results in the context of your medical history and symptoms to guide diagnosis or treatment decisions.
Short name
TMB-based Chemiluminescent Immunoassay (CMIA) Substance Level
Frequently asked questions
What does this test measure?
How long does it take to get results?
Can I eat or drink before 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