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Genetic test for fusion gene detection in blood (e.g., BCR-ABL in chronic myeloid leukemia)

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

This test checks for genetic changes (fusions) in white blood cells that may indicate certain blood-related cancers or conditions, such as chronic myeloid leukemia (CML).

Quick summary

["Detects abnormal gene combinations linked to blood disorders that may require treatment."]

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

Key facts at a glance

LOINC
95123-6
Short code
Gene fusion details Bld/T
Synonyms
Gene fusion details Bld/T
Category
coagulation
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 This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms of a blood disorder, such as fatigue, unexplained weight loss, or swollen lymph nodes. It’s also used to monitor treatment progress in people diagnosed with blood cancers like leukemia.

What to Expect Before the Test

A healthcare provider will collect a small sample of blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The test is quick and typically takes a few minutes.

What the Results Mean

Positive results can confirm a diagnosis of conditions like chronic myeloid leukemia (CML) or other genetic blood disorders. Negative results mean no obvious fusion genes were detected in this sample.

Common Conditions Monitored

This test is primarily used for diagnosing or managing blood cancers (e.g., leukemia) or other genetic disorders affecting blood cells. It helps track disease progression or treatment effectiveness.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fusion Gene Blood Test

Frequently asked questions

How often will I need this test?
If you have a blood disorder confirmed by this test, your doctor may order follow-up tests at regular intervals (e.g., every few months) to monitor changes or treatment effectiveness.
What if my results show a fusion gene?
Your doctor will explain the specific type of fusion gene found and discuss potential next steps, such as starting treatment or further testing. They’ll also explain how this result fits into your overall care plan.
Can I eat or drink before this test?
Check with your doctor or lab technician about fasting requirements, as some tests may require an 8–12 hour fast before drawing blood. Generally, water is allowed unless specified otherwise.
  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