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Unicellular organism count in blood (serum/plasma)

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

This test measures the number of unicellular organisms, such as certain parasites or bacteria, present in your blood. It helps identify infections caused by microscopic life forms.

Quick summary

["This test may help diagnose infections by unicellular organisms in your bloodstream."]

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

Key facts at a glance

LOINC
20801-7
Short code
E cuniculi Ab Ser Ql
Synonyms
E cuniculi Ab Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is Being Measured?

The test detects the presence and concentration of unicellular organisms (e.g., certain parasites like *Leishmania* or bacteria like *Mycoplasma*) in your blood sample. This is often done as part of a broader evaluation for infectious diseases.

Why Might This Test Be Ordered?

Your healthcare provider may recommend this test if you have symptoms like fever, fatigue, or unexplained infections, or if you live in an area with known risks for specific unicellular infections. It may also be used in research or specialized diagnostic scenarios.

How Is the Test Performed?

A blood sample is drawn, and the specimen is analyzed using a specialized method (e.g., microscopy, culture, or advanced imaging) to count and identify unicellular organisms. Results are reported as a count per unit volume (e.g., organisms per microliter).

What Does the Test Result Mean?

A high count may indicate an active infection by these organisms, while a normal count suggests no detectable presence. Interpretation depends on clinical context, symptoms, and other test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What are unicellular organisms in blood, and how do they differ from viruses or bacteria?
Unicellular organisms are single-celled life forms, such as certain parasites (e.g., *Leishmania*, *Trypanosoma*) or bacteria (e.g., *Mycoplasma*). Unlike viruses or typical bacteria, they can sometimes survive inside host cells and may require specialized tests to detect.
Can this test detect all types of infections?
No, this test focuses specifically on unicellular organisms. It may miss infections caused by viruses, fungi, or other bacteria. Your provider will choose tests based on your symptoms and medical history.
How long does it take to get results from this test?
Results can vary. Some tests may take days to weeks, depending on the method and laboratory procedures. Your provider will discuss timelines with you before ordering the 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