Individuals are required to fast for 10 to 12 hours prior to taking a blood clotting test.  No foods or liquids are allowed except for water during the fast. Many different medications, vitamins, supplements, and herbal remedies can affect results of the test.  No medications should be taken during the fast unless specifically approved by a doctor. 

Why It Is Used

A blood clotting test, also known as a coagulation blood test, is used to determine how well the blood is able to form blood clots to stop bleeding after the skin has been cut or broken.  The test may be ordered for any number of conditions where a doctor has concerns about the patient’s ability to form blood clots.  The test is often ordered before a patient has a surgery, and may also be used to discover the potential cause of multiple miscarriages.   

How It Works

During a coagulation blood test, a blood sample is taken and sent to the lab to discover any abnormalities in the level of platelets in the blood or the level of blood clotting agents in the body.  This test also includes a “bleeding test”.  For the bleeding test, the lab technician will clean an area of the skin and then make one or more small incisions to that area.  The technician then waits to see how long it takes the body to stop the bleeding on its own.  The technician blots the blood away from the skin every 30 seconds until the bleeding stops.  Blood clotting involves both cellular platelets and a protein called fibrin.  If either of these components is not working properly, it can cause blood to continue to bleed out of the body for much longer than it should.  This is a dangerous condition that can lead to substantial blood loss.


Low levels of platelets in the blood or low levels of fibrin in the blood can inhibit the body’s ability to form blood clots.  This deficiency may be due to a genetic predisposition or may be seen due to disease or environmental factors.  If there are low levels of both platelets and fibrin, it is usually an acquired condition or environmental condition - such as liver disease, vitamin K deficiency, or cancer. 

Thank you for browsing our selection of Coagulation blood tests and panels. Shop additional Heart Health Tests confidentially and order online without insurance or a doctor's note.


Walk-In Lab is contracted with LabCorp (LC) and Quest Diagnostics (QD) for routine lab testing. Please choose LC or QD to complete your order. If you prefer to receive a kit by mail for specimen collection, select Home Test Kits (KIT). LC, QD and KIT tests must be ordered separately.
LabCorp: Online lab testing is prohibited in MA, MD, NY, NJ and RI.
Quest Diagnostics: Online lab testing is prohibited in NY, NJ and RI.

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  1. LUPUS Auto-Immune Blood Test Panel

    A LUPUS blood test includes: Antinuclear Antibodies (ANA) Direct, Complete Blood Count with Differential and Platelets (CBC), Urinalysis Complete, Rheumatoid Arthritis (RA) Factor, Sedimentation Rate (ESR), C-Reactive Protein (CRP) High Sensitivity Cardiac Risk, Comprehensive Metabolic Panel - 14 tests, Prothrombin Time (PT) and Partial Thromboplastin Time (PTT).

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  2. Fibrinogen Antigen Blood Test

    Diagnosis of homozygous and heterozygous fibrinogen deficiency as well as dysfibrinogenemia; diagnosis of disseminated intravascular coagulation;1-3 fibrinogen levels can be used to assess the effectiveness of thrombolytic therapy.

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  3. Protein C Antigen Plasma Test

    Confirmation and characterization of protein C deficiency.

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  4. D-Dimer Blood Test

    A D-Dimer Blood Test rules out deep vein thrombosis (DVT) and pulmonary embolism; evaluate disseminated intravascular coagulation; can be used to monitor the extent of clot lysis during thrombolytic therapy.

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  5. Homocysteine Blood Test

    Measures the level of homocysteine, an amino acid, in your blood.

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  6. Fibrinogen Activity Blood Test

    Test to check for fibrinogen, coagulation factor, a protein that is essential for blood clot formation.

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  7. Prothrombin Time (PT) w/INR and Partial Thromboplastin Time (PTT) Blood Test

    The prothrombin time (PT) w/INR test measures the length of time it takes for a blood clot to form in a sample of blood. Partial Thromboplastin Time (PTT) test is ordered when someone has unexplained bleeding or clotting. The PTT test is usually used as a starting place when investigating the cause of a bleeding or thrombotic episode.

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  8. Prothrombin Time (PT) w/INR Blood Test

    A Protime INR measures the length of time it takes for a clot to form in a sample of blood.

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  9. AspirinWorks; (11-Dehydro Thromboxane B2) Urine Test, Random

    The AspirinWorks Test Kit is an enzyme-linked immunoassay (ELISA) to determine levels of 11-dehydrothromboxane B2 (11dhTxB2) in human urine, which aids in the qualitative detection of aspirin effect in apparently healthy individuals post ingestion.

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