Blast Cells, CD45, Nonfractionated Whole Blood — Flow Cytometry
A flow-cytometry blood test that identifies and counts blast cells (immature blood cells), using the CD45 cell marker.
["This test measures immature blood cells in a blood sample and can help evaluate suspected blood cancers."]
Key facts at a glance
- LOINC
- 107078-8
- Short code
- Blasts.CD45 NFr Bld FC
- Synonyms
- Blasts.CD45 NFr Bld FC
- Category
- liver
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- 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
- Method
- flow-cytometry
- CPT
- 84484
- SNOMED
- 302774002
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
What is this test?
This test measures blast cells, which are immature blood cells that have not yet fully matured. Flow cytometry uses fluorescent markers, including CD45, to help identify and count these cells in whole blood.
Why might I need this test?
It may be ordered when a blood count is abnormal or when a clinician is evaluating a possible leukemia, lymphoma, or another blood-cell disorder. It can also be used to monitor certain cancers or treatment-related changes.
How is the test performed?
A blood sample is analyzed with flow cytometry, which measures light emitted by labeled cells. The laboratory examines the cells' characteristics, including CD45 expression, to identify and estimate the number of blasts.
How do I prepare for the test?
No special preparation is usually required. Follow the laboratory's instructions, and tell your clinician if you have recently received chemotherapy, stem-cell transplantation, or other treatment that could affect blood-cell findings.
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 or abnormal pattern of blast cells may occur with leukemia, lymphoma, marrow disorders, or recovery after intensive treatment. Flow cytometry provides information about the cells' markers but usually must be interpreted with the blood count, symptoms, examination, and sometimes a bone marrow biopsy. A low or absent blast count does not by itself rule out a blood disorder.
Short name
Blast cell count
Frequently asked questions
What are blast cells?
Does this test diagnose cancer by itself?
Why is CD45 included in the test name?
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