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Subtelomere Analysis (from Whole Blood)

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

This test examines the integrity of specific regions at the ends of chromosomes called subtelomeres, which may be affected in certain genetic conditions or chromosomal abnormalities.

Quick summary

["Subtelomere analysis helps detect potential genetic risks or chromosomal instability that may not be visible on standard blood tests."]

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

Key facts at a glance

LOINC
58454-0
Short code
Subtelomere analysis Bld/T
Synonyms
Subtelomere analysis 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
CPT
86038
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 healthcare provider may recommend this test if you have symptoms or risk factors linked to chromosomal abnormalities, such as developmental delays, learning difficulties, or unexplained health issues. It could also be part of a broader genetic evaluation for conditions like certain cancers or inherited disorders.

What to Expect Before the Test

No special preparation is needed. You’ll provide a small sample of whole blood, typically drawn from your arm. The test analyzes DNA from your blood cells to check subtelomere regions.

What the Results Mean

Results may show normal subtelomere structure or identify potential deletions or duplications in these regions. Abnormal findings could indicate a higher risk for genetic conditions requiring further evaluation.

Common Conditions Linked to Subtelomere Abnormalities

While subtelomere analysis isn’t specific to one disease, it may help identify chromosomal imbalances associated with conditions like Down syndrome, certain cancers, or developmental disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Subtelomere Testing

Frequently asked questions

What is subtelomere analysis used for?
Subtelomere analysis is primarily used to detect structural changes in chromosome ends that may contribute to genetic disorders, developmental issues, or increased cancer risk. It’s often part of a genetic evaluation when other tests don’t provide a clear explanation for symptoms.
How is this test different from a standard chromosome analysis?
Unlike traditional chromosome testing (e.g., karyotyping), subtelomere analysis focuses specifically on the subtelomeric regions—smaller areas at chromosome ends—that may not be visible in standard tests. It’s a more targeted approach for detecting specific genetic imbalances.
Is this test painful or invasive?
The test involves a small blood draw, similar to other blood tests. Most people experience minimal discomfort, and no special recovery is needed. The sample is processed in a lab to analyze DNA.
  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