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Cytogenetic Analysis of White Blood Cells (WBC) for Abnormal Findings

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

This test examines the genetic structure of your white blood cells to check for any unusual chromosomal changes that might suggest conditions like cancer or genetic disorders.

Quick summary

["A simple blood test to detect potential genetic abnormalities in your immune cells."]

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

Key facts at a glance

LOINC
93356-4
Short code
CYTOABN
Synonyms
Cells w cytogenetic abnl Bld/T
Category
chemistry
Sample
whole-blood
Container
EDTA (lavender-top) tube for whole blood; sterile container for tissue specimens; heparinized tube may be acceptable for some cytogenetic studies but not for molecular genetic testing
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
0–120 years
Method
molgen
CPT
88264, 88269, 88262, 88271, 88275, 88291, or 81229-81355 depending on specific molecular method and abnormality
SNOMED
167958002
Specimen volume
Whole blood: 3-10 mL (minimum 1 mL for peripheral blood); Tissue: adequate sample size as determined by specimen type; Bone marrow: 1-3 mL
Stability
Whole blood: Room temperature 24-48 hours; Refrigerated (2-8°C) up to 7 days; Do not freeze. Tissue: Variable depending on preservation; fresh tissue should be processed promptly or placed in appropriate transport medium.
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
72–672 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like unexplained fatigue, frequent infections, or a family history of blood disorders. It can also be part of a routine check for certain cancers or genetic conditions.

How the Test Works

A small blood sample is taken, and your white blood cells are analyzed under a microscope to identify any chromosomal abnormalities. This process may involve culturing cells for a few days to grow them in the lab for better examination.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for a few hours before the blood draw if your provider specifies it, but this is not always the case for cytogenetic testing.

What to Expect During the Test

You’ll have a small needle inserted into your arm to draw blood. It typically takes a few minutes, and you may feel a brief pinch. The blood sample is then sent to a lab for detailed genetic analysis.

Reference range

Reference range varies by specific cytogenetic abnormality and clinical context. Results are reported as the number (#) of cells examined that contain the cytogenetic abnormality identified. A normal result typically reports 0 cells with the specific abnormality out of the total cells analyzed (e.g., 0/20 cells). Clinical interpretation required.N/A

Specimen: whole-blood

No special patient preparation or fasting required. Patient should be informed about the genetic nature of the test and appropriate informed consent may be required per institutional policy. Genetic counseling may be recommended based on results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings in white blood cell chromosomes can indicate conditions such as leukemia, lymphoma, or other genetic disorders. Detecting these changes early can help guide treatment options and improve outcomes.

Short name

WBC Cytogenetics Screening

Frequently asked questions

What does a positive result mean?
A positive result means your white blood cells have chromosomal changes that may require further medical evaluation. Your doctor will discuss the findings with you and may recommend additional tests or treatments based on the results.
How long does it take to get results?
Results can take several days to a couple of weeks, depending on the complexity of the analysis. Your healthcare provider will contact you once the results are ready.
Can lifestyle changes affect this test?
Generally, lifestyle changes like diet or exercise do not directly impact cytogenetic testing results. However, if you are taking medications or have certain health conditions, always inform your provider before 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