BACK TOTOP Browse A-ZSearchBrowse A-ZABCDEFGHIJKLMNOPQRSTUVWXYZ0-9 E-mail FormEmail ResultsName:Email address:Recipients Name:Recipients address:Message: Print-FriendlyBookmarksbookmarks-menuFactor X assayStuart-Prower factorThe factor X assay is a blood test to measure the activity of factor X. This is one of the proteins in the body that helps the blood clot. How the Test is Performed A blood sample is needed.Blood sampleVenipuncture is the collection of blood from a vein. It is most often done for laboratory testing.Read Article Now Book Mark Article How to Prepare for the Test You may need to stop taking some medicines before this test. Your health care provider will tell you which ones. How the Test will Feel When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away. Why the Test is Performed This test may be used to find the cause of excessive bleeding (decreased blood clotting). The decreased clotting may be caused by an abnormally low level of factor X. Normal Results A normal value is 50% to 200% of the laboratory control or reference value.Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different samples. Talk to your provider about the meaning of your specific test results. What Abnormal Results Mean Decreased factor X activity may be related to:Disorder in which abnormal proteins build up in tissues and organs (amyloidosis) AmyloidosisPrimary amyloidosis is a rare disorder in which abnormal proteins build up in tissues and organs. Clumps of the abnormal proteins are called amyloid...Read Article Now Book Mark Article Factor X deficiency (a bleeding disorder caused by a lack of blood clotting factor X) Factor X deficiencyFactor X (ten) deficiency is a disorder caused by a lack of a protein called factor X in the blood. It leads to problems with blood clotting (coagul...Read Article Now Book Mark Article Disorder in which the proteins that control blood clotting become overactive (disseminated intravascular coagulation) Disseminated intravascular coagulationDisseminated intravascular coagulation (DIC) is a serious disorder in which the proteins that control blood clotting become overactive.Read Article Now Book Mark Article Fat malabsorption (not absorbing enough fat from your diet) MalabsorptionMalabsorption involves problems with the body's ability to take in (absorb) nutrients from food.Read Article Now Book Mark Article Heparin use Liver disease Liver diseaseThe term "liver disease" applies to many conditions that stop the liver from working or prevent it from functioning well. Abdominal pain or swelling...Read Article Now Book Mark Article Vitamin K deficiency Vitamin KVitamin K is a fat-soluble vitamin. Your body stores vitamin K in the liver and other body tissues, including the brain, heart, pancreas, and bone....Read Article Now Book Mark Article Taking blood thinners Risks There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.Other risks associated with having blood drawn are slight, but may include:Excessive bleeding Fainting or feeling lightheaded Multiple punctures to locate veins Hematoma (blood accumulating under the skin) Infection (a slight risk any time the skin is broken)This test is most often performed on people who have bleeding problems. The risk of excessive bleeding is slightly greater than for people without bleeding problems.Bleeding problemsBleeding disorders are a group of conditions in which there is a problem with the body's blood clotting process. These disorders can lead to heavy a...Read Article Now Book Mark Article Open ReferencesReferencesGailani D, Benjamin FT, Wheeler AP. Rare coagulation factor deficiencies. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 135.Ragni MV. Hemorrhagic disorders: coagulation factor deficiencies. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 165.Sarode R, Kessler CM. Coagulation and fibrinolysis. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 40.AllVideoImagesTog Tests for Factor X assay Factor X assayFactor XII assayFactor IX assayFactor II (prothrombin) assayFactor VII assayFactor VIII assayFactor V assayRelated Information Factor X deficiency(Condition)Malabsorption(Condition)Liver disease(Condition)Vitamin K(Nutrition)Vitamins and Phytonutrients - InDepth(In-Depth) Review Date: 2/2/2023 Reviewed By: Mark Levin, MD, Hematologist and Oncologist, Monsey, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. 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Factor X assayStuart-Prower factorThe factor X assay is a blood test to measure the activity of factor X. This is one of the proteins in the body that helps the blood clot. How the Test is Performed A blood sample is needed.Blood sampleVenipuncture is the collection of blood from a vein. It is most often done for laboratory testing.Read Article Now Book Mark Article How to Prepare for the Test You may need to stop taking some medicines before this test. Your health care provider will tell you which ones. How the Test will Feel When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away. Why the Test is Performed This test may be used to find the cause of excessive bleeding (decreased blood clotting). The decreased clotting may be caused by an abnormally low level of factor X. Normal Results A normal value is 50% to 200% of the laboratory control or reference value.Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different samples. Talk to your provider about the meaning of your specific test results. What Abnormal Results Mean Decreased factor X activity may be related to:Disorder in which abnormal proteins build up in tissues and organs (amyloidosis) AmyloidosisPrimary amyloidosis is a rare disorder in which abnormal proteins build up in tissues and organs. Clumps of the abnormal proteins are called amyloid...Read Article Now Book Mark Article Factor X deficiency (a bleeding disorder caused by a lack of blood clotting factor X) Factor X deficiencyFactor X (ten) deficiency is a disorder caused by a lack of a protein called factor X in the blood. It leads to problems with blood clotting (coagul...Read Article Now Book Mark Article Disorder in which the proteins that control blood clotting become overactive (disseminated intravascular coagulation) Disseminated intravascular coagulationDisseminated intravascular coagulation (DIC) is a serious disorder in which the proteins that control blood clotting become overactive.Read Article Now Book Mark Article Fat malabsorption (not absorbing enough fat from your diet) MalabsorptionMalabsorption involves problems with the body's ability to take in (absorb) nutrients from food.Read Article Now Book Mark Article Heparin use Liver disease Liver diseaseThe term "liver disease" applies to many conditions that stop the liver from working or prevent it from functioning well. Abdominal pain or swelling...Read Article Now Book Mark Article Vitamin K deficiency Vitamin KVitamin K is a fat-soluble vitamin. Your body stores vitamin K in the liver and other body tissues, including the brain, heart, pancreas, and bone....Read Article Now Book Mark Article Taking blood thinners Risks There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.Other risks associated with having blood drawn are slight, but may include:Excessive bleeding Fainting or feeling lightheaded Multiple punctures to locate veins Hematoma (blood accumulating under the skin) Infection (a slight risk any time the skin is broken)This test is most often performed on people who have bleeding problems. The risk of excessive bleeding is slightly greater than for people without bleeding problems.Bleeding problemsBleeding disorders are a group of conditions in which there is a problem with the body's blood clotting process. These disorders can lead to heavy a...Read Article Now Book Mark Article Open ReferencesReferencesGailani D, Benjamin FT, Wheeler AP. Rare coagulation factor deficiencies. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 135.Ragni MV. Hemorrhagic disorders: coagulation factor deficiencies. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 165.Sarode R, Kessler CM. Coagulation and fibrinolysis. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 40.