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Chromosomal rearrangement analysis (blood)

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

This test examines the structure of your blood cells’ chromosomes for any unusual rearrangements, which may indicate genetic conditions or risks for certain cancers.

Quick summary

["This test helps identify genetic changes that could affect your health."]

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

Key facts at a glance

LOINC
94591-5
Short code
Chromosome rearrangement Bld/T
Synonyms
Chromosome rearrangement Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
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

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms or risk factors for genetic disorders (e.g., developmental delays, birth defects), a family history of chromosomal abnormalities, or suspected cancer (e.g., leukemia, lymphoma). It may also be used during pregnancy to assess fetal chromosomal health or after exposure to potential genetic risks.

What Does the Test Involve?

A small blood sample is taken from a vein in your arm. The sample is then analyzed under a microscope to examine the chromosomes for any structural changes, such as deletions, duplications, or translocations.

Sample Collection and Preparation

The blood sample is processed to isolate white blood cells, which contain chromosomes. Special staining techniques highlight the chromosomes for detailed examination.

How Results Are Interpreted

Results are compared to a standard reference to identify any chromosomal rearrangements. Findings may include normal results, benign rearrangements, or significant abnormalities that require further medical evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Chromosomal rearrangements can cause genetic disorders, increase cancer risk, or influence how certain medications work. They may also be incidental findings in asymptomatic individuals. Your healthcare provider will discuss results and next steps based on your clinical context.

Short name

Chromosomal Study

Frequently asked questions

What Are Common Reasons for This Test?
Common reasons include evaluating symptoms like unexplained developmental delays, assessing risks for genetic disorders, diagnosing suspected cancers, or monitoring conditions like Down syndrome or other chromosomal syndromes.
How Long Does It Take to Get Results?
Results typically take 1 to 4 weeks, depending on the complexity of the analysis and laboratory processing times.
Are There Any Risks or Side Effects?
The most common side effect is a mild bruise or soreness at the injection site, which usually resolves quickly. There are no other known risks associated with this 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