CD2-Positive Blasts, Absolute Count
A laboratory count of blast cells that carry the CD2 protein, usually used with other findings to evaluate blood or marrow disorders.
["This test measures CD2-expressing blast cells to help evaluate certain blood cancers and other immune-cell disorders."]
Key facts at a glance
- LOINC
- 51114-7
- Short code
- CD2 Blasts Spec-aCnc
- Synonyms
- CD2 Blasts Spec-aCnc
- 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?
Blasts are immature blood cells. CD2 is a protein found on many T cells, a type of immune cell. This test reports the absolute number of blast cells that express CD2 in the submitted specimen.
Why might I need this test?
This test may be ordered when a blood count, smear, or other findings suggest an unusual blood-cell disorder. It is often used as part of a broader evaluation for leukemia, lymphoma, or other conditions affecting blood cells.
How is the test performed?
A laboratory examines cells from the ordered specimen, which may be blood or bone marrow, and identifies CD2-expressing blasts. Flow cytometry is commonly used, although the exact laboratory method should be confirmed with the performing lab.
How do I prepare for the test?
No special preparation is usually required for a blood sample. If bone marrow is needed, the collection procedure and any preparation instructions will be provided by your healthcare professional.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An increased number of CD2-positive blasts may occur in certain blood cancers, particularly disorders involving T-lineage cells. It may also reflect other changes in blood-cell production, so this result is not diagnostic by itself. Your clinician will interpret it with the cell counts, blood smear, other immune markers, symptoms, and any necessary imaging or bone marrow findings.
Short name
CD2-positive blast count
Frequently asked questions
What does a CD2-positive blast mean?
Does this test diagnose leukemia or lymphoma?
Which specimen is used for 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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy