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Visual assessment of coagulation test results (qualitative screening)

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

This test involves observing how your blood clots after being drawn, which helps detect early signs of bleeding disorders or clotting issues.

Quick summary

["A simple visual check to identify potential clotting problems before lab results confirm them."]

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

Key facts at a glance

LOINC
18313-7
Short code
Coag Smn Ql Visual
Synonyms
Coag Smn Ql Visual
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
visual
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

Your blood sample is placed on a special surface to observe clot formation. A technician checks for abnormal bleeding (prolonged clotting) or clotting (too fast) that may indicate underlying conditions like hemophilia or von Willebrand disease.

How It’s Performed

After drawing blood, a small amount is placed on a glass slide or similar surface. The technician watches for clot formation over time. If clotting is delayed or occurs too quickly, it may trigger further testing.

Why It’s Done

This screening helps identify bleeding or clotting risks before full lab tests are needed. It’s often used in emergency settings or when symptoms suggest coagulation problems.

Common Conditions It May Help Detect

Visual coagulation screening can signal potential bleeding disorders (e.g., hemophilia) or clotting disorders (e.g., thrombophilia). It’s not a definitive test but may prompt additional blood tests for deeper analysis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Coagulation Screen Visual Check

Frequently asked questions

Why might I need this test?
You may need this test if you have symptoms like excessive bleeding (nosebleeds, bruising easily), prolonged bleeding after cuts, or if you’re scheduled for surgery. It helps doctors quickly assess clotting function before proceeding with more detailed tests.
What do abnormal results mean?
If your blood doesn’t clot normally, it may mean you have a bleeding disorder. If clotting happens too fast, it could indicate a clotting disorder. Your doctor will discuss next steps, such as additional blood tests or treatment options.
Can I prepare for this test?
No special preparation is needed. Avoid aspirin or blood thinners 48 hours before testing if possible, as they can affect clotting results.
  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