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Cytology Examination for Malignant Cells (Cell Block from Blood)

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

This test examines a sample of your blood to check for abnormal cells that may indicate cancer. It helps determine if cancerous cells are present in your bloodstream.

Quick summary

["This test can help identify early signs of blood-related cancers or other conditions affecting cell health in your blood."]

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

Key facts at a glance

LOINC
34915-9
Short code
Malignant cells NFr Bld
Synonyms
Malignant cells NFr Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 like unexplained weight loss, fatigue, frequent infections, or unusual bleeding. It could also be part of a routine check-up for individuals at higher risk of blood cancers, such as those with a family history or certain genetic conditions.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your vein (venipuncture) to draw a blood sample. If you’re nervous, let your healthcare provider know so they can help make the process more comfortable.

What Happens During the Test

The blood sample is sent to a lab where it’s processed into a cell block. Microscopic examination looks for abnormal cells, including those that may be malignant (cancerous). This process can take several days as results are reviewed by a pathologist.

What the Results Mean

If malignant cells are found, it may indicate a blood cancer (e.g., leukemia) or other conditions like lymphoma. If no malignant cells are detected, it means your blood cells appear normal in this sample, but further tests may still be needed to rule out other issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Malignant Cells in Blood Screen

Frequently asked questions

How long will I need to wait for results?
Results can take several days to a few weeks, depending on lab processing and review times. Your healthcare provider will contact you once they have the final report.
What if my test shows malignant cells?
If malignant cells are found, you’ll likely need further testing to understand the cause and develop a treatment plan. Your doctor may recommend additional blood tests, imaging scans, or a bone marrow biopsy to get more details about the cancer.
Can I prevent this test from being needed?
While you can’t prevent all conditions that may lead to this test, maintaining good health through regular check-ups, a balanced diet, and avoiding smoking or excessive alcohol can help reduce risks of certain cancers and related conditions.
  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