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Fibrinogen
Quest Diagnostics1 test optionFrom $27.66
Fibrinogen
Quest DiagnosticsCatalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.
What this laboratory test evaluates
Fibrinogen Activity, Clauss
This is blood test used to measure the activity of fibrinogen, a key protein involved in blood clotting. This test is especially useful for diagnosing suspected bleeding disorders or inherited fibrinogen deficiencies. It is also used to assess the risk of cardiovascular events and to monitor patients receiving anticoagulant therapy.
What patients is this test right for?This test is particularly important for individuals who have increased risk of bleeding or cloring dissorders as well as in diagnosing the cause of unexplained bleeding or bruising.
What type of sample is required for this test?One full 3.2% sodium citrate (light blue-top) tube
Test ResourcesFor more information, please consult your healthcare provider.
Additional test information
Fibrinogen Activity, Clauss – This is blood test used to measure the activity of fibrinogen, a key protein involved in blood clotting. This test is especially useful for diagnosing suspected bleeding disorders or inherited fibrinogen deficiencies. It is also used to assess the risk of cardiovascular events and to monitor patients receiving anticoagulant therapy.
Collection and processing
- Sample type: Whole blood
- Fasting: No
- Estimated laboratory processing: Results should be available in 2 – 5 business days after the sample is collected
How Sunridge uses laboratory information
Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.
Before requesting this test
Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.
Common questions about this laboratory test
- What sample does this test require?
- The listed sample type is Whole blood. Confirm current collection instructions in the approved order.
- Does this test require fasting?
- The current catalog record lists fasting as: No. Follow the instructions supplied with the approved order.
- How long does laboratory processing usually take?
- Results should be available in 2 – 5 business days after the sample is collected. Timing can change after collection or if a laboratory requires additional review.
About this test
Fibrinogen Activity, Clauss
This is blood test used to measure the activity of fibrinogen, a key protein involved in blood clotting. This test is especially useful for diagnosing suspected bleeding disorders or inherited fibrinogen deficiencies. It is also used to assess the risk of cardiovascular events and to monitor patients receiving anticoagulant therapy.
What patients is this test right for?This test is particularly important for individuals who have increased risk of bleeding or cloring dissorders as well as in diagnosing the cause of unexplained bleeding or bruising.
What type of sample is required for this test?One full 3.2% sodium citrate (light blue-top) tube
Test ResourcesFor more information, please consult your healthcare provider.
Additional details
Fibrinogen Activity, Clauss - This is blood test used to measure the activity of fibrinogen, a key protein involved in blood clotting. This test is especially useful for diagnosing suspected bleeding disorders or inherited fibrinogen deficiencies. It is also used to assess the risk of cardiovascular events and to monitor patients receiving anticoagulant therapy.
Highlighted health areas
- Cardiovascular
- Hematology
Biomarkers and report focus
The exact analytes and report format can change. Confirm the current contents in the Fullscript order before payment.
- Fibrinogen Activity, Clauss