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Viscosity of Clotting Factors (Serum)

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

This test measures how thick or sticky your blood’s clotting factors appear in serum. It helps assess blood clotting efficiency, especially in conditions affecting protein or fibrinogen levels.

Quick summary

["Understanding your blood’s clotting factor thickness can help diagnose bleeding or clotting disorders."]

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

Key facts at a glance

LOINC
41208-0
Short code
Visc+Liquefaction Smn
Synonyms
Visc+Liquefaction Smn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Measures

Viscosity refers to how easily fluids flow. In this test, we examine the serum (liquid part of blood after clotting) to see how its clotting factors behave under stress. High viscosity may suggest abnormal protein levels or clotting issues, while low viscosity could indicate dilution or loss of clotting components.

Why It Matters in Blood Health

Clotting factors are proteins essential for blood clotting. If they’re too thick (high viscosity), clots may form too easily, increasing stroke or heart attack risk. If too thin, bleeding risks rise. This test helps monitor conditions like liver disease, protein deficiencies, or inherited clotting disorders.

Common Conditions Affecting Results

Conditions like liver disease (reducing clotting factor production), severe dehydration (thickening serum), or certain cancers (altering protein balance) may change viscosity. It’s often used alongside other tests for deeper diagnosis.

Sample Preparation and Testing

You’ll donate a blood sample (whole blood drawn into a tube). After clotting, we separate the serum and analyze its clotting factor behavior under controlled conditions. No special preparation is needed, but avoid alcohol or heavy meals 24 hours before.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Clotting Factor Viscosity

Frequently asked questions

How long will results take?
Results are typically available within 24–48 hours, depending on lab volume. Follow-up with your healthcare provider for interpretation.
Can I eat or drink before this test?
Standard fasting is not required, but avoid alcohol or heavy meals 24 hours before to ensure accurate results.
Does this test replace other blood tests?
No, this test is supplementary. It’s often paired with clotting factor panels or coagulation studies for a full picture of your blood 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