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Serum or plasma concentration of a specific protein or substance (qualitative probe)

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

This test measures the presence or amount of a particular substance in your blood, often to check for infections, metabolic conditions, or other health concerns.

Quick summary

["It helps doctors diagnose or monitor certain health issues by detecting specific substances in your blood."]

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

Key facts at a glance

LOINC
101299-6
Short code
S dysgal eqsmls DNA Throat Ql NAA+non-probe
Synonyms
S dysgal eqsmls DNA Throat Ql NAA+non-probe
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
non-probe-amp-tar
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 conditions like infections (e.g., bacterial or viral), kidney disease, liver problems, or other metabolic disorders. It could also be part of routine screening or monitoring for known conditions.

What to Expect Before the Test

No special preparation is typically needed, but you may be asked to fast for a few hours if the test involves a specific type of blood draw. Avoid smoking or consuming certain foods/drinks for the recommended period before testing.

During the Test Process

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause significant discomfort. The blood sample will be sent to a lab for analysis.

What the Results Mean

Results are qualitative (positive or negative) rather than numerical, indicating whether the substance is present or not. Your provider will interpret these results in the context of your medical history and symptoms to guide further action.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

What does this test measure?
This test detects the presence of a specific substance in your bloodstream, which can help identify infections, inflammation, or other underlying health issues. The qualitative nature means it confirms presence or absence rather than precise levels.
How often should I get this test?
Frequency depends on your health condition and treatment plan. Your healthcare provider will determine how often this test is needed based on your diagnosis and symptoms.
Can I eat or drink before this test?
Check with your healthcare provider for specific instructions, but generally, you may eat normally unless they advise fasting for a particular test type.
  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