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Serum or plasma concentration of substance (unspecified analyte) measured by immunoassay

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

This test measures the amount of a specific protein or substance in your blood, typically using a blood draw. It helps doctors assess conditions related to hormone, enzyme, or immune function.

Quick summary

["This test detects small molecules or proteins in your blood that may signal health concerns."]

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

Key facts at a glance

LOINC
2579-1
Short code
LH SerPl-sCnc
Synonyms
LH SerPl-sCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
1.5
Ref high
9
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
83002
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 Might Be Ordered

Your healthcare provider may recommend this test if they suspect issues like hormone imbalances, infections, liver or kidney problems, or other conditions affecting protein levels in your blood. It could also be part of routine monitoring for certain diseases.

What to Expect Before the Test

You’ll likely have a simple blood draw, usually from a vein in your arm. No special preparation is needed unless your doctor specifies otherwise. If you’re on blood thinners, let your provider know before the test.

What the Test Results Mean

Results are compared to a general range for healthy adults, but exact values depend on the specific substance being measured. Abnormal results may prompt further testing or adjustments to treatment.

Common Conditions Monitored

This test can help diagnose or monitor conditions such as thyroid disorders, autoimmune diseases, or metabolic disorders. It may also be used to check for protein loss due to kidney disease or other systemic issues.

Reference range

Follicular: 1.5-9.0 mIU/mLN/A

Specimen: serum

For females: inform if menstrual cycle status. For certain tests, timing within menstrual cycle may matter.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What does an abnormal result mean?
An abnormal result doesn’t necessarily mean you have a problem, but it may signal the need for further evaluation. Your doctor will discuss the findings with you and determine the next steps, such as additional tests or treatments.
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 may require a phone call or in-person visit if needed.
Can I eat or drink before this test?
Most blood tests, including this one, don’t require fasting. However, always check with your doctor or lab technician for any specific instructions related to your test.
  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