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Chromosomal and Cytogenetic Analysis for Basic Blood Cell Counts (with Specific Focus on Leukocyte Morphology)

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

This test examines the chromosomes and structure of blood cells, including white blood cells, to detect any abnormalities that might suggest genetic or cellular disorders.

Quick summary

["It helps identify conditions affecting blood cell formation or structure."]

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

Key facts at a glance

LOINC
77314-3
Short code
Chromos cyto basic assoc obs Pnl Bld/T
Synonyms
Chromos cyto basic assoc obs Pnl Bld/T
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cytogenetics
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 This Test Measures

The test involves analyzing chromosomal integrity and the physical characteristics of blood cells, such as white blood cells, to look for irregularities. This may include checking for abnormal cell shapes, sizes, or genetic markers that could indicate conditions like leukemia, chromosomal abnormalities, or other hematologic disorders.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like unexplained fatigue, frequent infections, bleeding disorders, or if there’s a family history of genetic blood disorders. It’s also used in diagnosing conditions like myelodysplastic syndromes, acute leukemia, or other hematologic malignancies.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The sample is processed to isolate blood cells and chromosomes for microscopic examination. This test may require additional specialized staining or techniques to highlight cellular structures.

Common Conditions Detected

This test can help identify chromosomal abnormalities (e.g., translocations, deletions) or cytogenetic changes in blood cells. It may also reveal issues with cell differentiation or proliferation, which are key in diagnosing blood cancers or genetic syndromes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Basic Blood Cell Chromosomal/Cytogenetic Evaluation

Frequently asked questions

What does this test tell me about my health?
This test provides detailed information about the genetic makeup and physical characteristics of your blood cells. It can confirm or rule out conditions like leukemia, chromosomal disorders, or other hematologic diseases. Results may guide treatment decisions, such as targeted therapies or further genetic testing.
How long will I need to wait for results?
Results can take several days to a couple of weeks, depending on the complexity of the analysis. Your healthcare provider will discuss the findings with you once they are ready.
Can I eat or drink before this test?
You may eat and drink normally before this test, as it does not require fasting. However, follow any specific instructions your provider gives you, as they may vary.
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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