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CD2-Positive Blasts as a Fraction of All Blasts in Specimen

Published: August 9, 2026Updated: August 17, 2026

Measures the fraction of blast cells carrying the CD2 marker, usually as part of flow cytometry used to characterize blood or bone marrow cells.

Quick summary

["This result helps determine whether blast cells show features associated with T-cell lineage."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
51111-3
Short code
CD2 Blasts/Blasts NFr Spec
Synonyms
CD2 Blasts/Blasts NFr Spec
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
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 this test?

This test measures the proportion of blast cells that express CD2, a protein found on many T cells. It is generally reported as part of a larger flow-cytometry panel.

Why might I need this test?

It may be ordered when blood or bone marrow cells appear abnormal and the cause of a possible leukemia, lymphoma, or other blood disorder is being investigated.

How is the test performed?

A blood or bone marrow sample is analyzed, usually by flow cytometry. The laboratory identifies blast cells and determines what fraction of them carry the CD2 marker.

How do I prepare for the test?

No special preparation is usually required for the laboratory measurement itself. If a bone marrow sample is needed, the collection process and any preparation instructions should be confirmed with your care team.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CD2-positive blast fraction

Frequently asked questions

What does a CD2-positive blast mean?
It is a blast cell that carries the CD2 protein on its surface. CD2 is commonly expressed by T cells, but it is not exclusive to them.
Does this result diagnose leukemia or lymphoma?
No. It is one part of a broader evaluation and must be interpreted together with other laboratory findings and your medical history.
Is fasting required for this test?
Fasting is generally not required for the CD2 measurement itself. Preparation may vary if the laboratory needs a special sample collection.
  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 17, 2026. · Read our editorial policy