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Tumor Volume, Viable — Maximum Diameter

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

Measures the greatest diameter of viable tumor tissue identified in a pathology specimen, providing information about tumor size.

Quick summary

["This result estimates the largest dimension of tumor tissue that appears viable, or capable of containing living cancer cells."]

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

Key facts at a glance

LOINC
79927-0
Short code
TV Vmax dias
Synonyms
TV Vmax dias
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-doppler
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This measurement is obtained from tissue examined by a pathologist. It describes the maximum diameter of the area of viable tumor tissue, meaning tissue that appears to contain living cancer cells.

Why might I need this test?

Tumor size can help clinicians understand the extent of cancer and may contribute to staging, prognosis, and decisions about surgery, radiation, chemotherapy, or other treatments. It is interpreted together with the tumor type, location, margins, lymph nodes, and other pathology findings.

How is the test performed?

A pathologist examines tissue removed by a biopsy or surgery, identifies areas of viable tumor, and measures their largest diameter using calibrated pathology equipment. The measurement is then included in the pathology report.

How do I prepare for the test?

No special preparation is usually needed for the measurement itself. Follow your clinician's instructions about the biopsy or surgery and ask the care team to explain how the result will be used in your treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Viable tumor maximum diameter

Frequently asked questions

Does a larger maximum diameter mean my cancer is more aggressive?
Not necessarily. Tumor size can be relevant to staging, but aggressiveness is also influenced by tumor type, grade, genetic features, lymph-node findings, and other clinical information.
Why does the report mention both viable tumor and maximum diameter?
Viable tumor refers to tissue that appears to contain living cancer cells. The maximum diameter describes the largest measurement of that tissue rather than the entire specimen, which may also contain normal tissue, necrosis, scar, or inflammation.
Will this measurement determine my treatment?
It may be one of several factors considered, but it usually does not determine treatment by itself. Your oncologist will interpret it together with the complete pathology report, imaging findings, and your overall health.
  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