Fibrinogen is a protein produced by the liver. This protein helps stop bleeding by helping blood clots to form. A blood test can be done to tell how much fibrinogen you have in the blood.
Alternative NamesSerum fibrinogen; Plasma fibrinogen; Factor I; Hypofibrinogenemia test
How the test is performedBlood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.
Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.
Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.
How to prepare for the testThere is no special preparation needed.
How the test will feelWhen the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performedYour doctor may order this test if you have problems with blood clotting, particularly if you have excessive bleeding.
Normal ValuesThe normal range is 200-400 milligrams per deciliter (mg/dL).
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What abnormal results meanAbnormal results may be due to:
Additional conditions under which the test may be performed:
What the risks areThere is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
Note: This test is most often performed on people who have bleeding disorders. The risk of excessive bleeding is slightly greater in such people than for those who do not have bleeding problems.
ReferencesKessler C. Hemorrhagic disorders: Coagulation factor deficiencies. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 180.
Fibrinogen is a protein produced by the liver. This protein helps stop bleeding by helping blood clots to form. A blood test can be done to tell how much fibrinogen you have in the blood.
Alternative NamesSerum fibrinogen; Plasma fibrinogen; Factor I; Hypofibrinogenemia test
How the test is performedA blood sample is needed. For information on how this is done, see: Venipuncture
How to prepare for the testThere is no special preparation needed.
How the test will feelWhen the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performedYour doctor may order this test if you have problems with blood clotting, especially if you have excessive bleeding.
Normal ValuesThe normal range is 200 - 400 milligrams per deciliter (mg/dL).
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.
What abnormal results meanAbnormal results may be due to:
The test may also be performed for placenta abruptio.
What the risks areThere is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
Note: This test is most often performed on people who have bleeding disorders. The risk of excessive bleeding is slightly greater in such people than for those who do not have bleeding problems.
ReferencesGailani D, Neff AT. Rare coagulation factor deficiencies. In: Hoffman R, Benz EJ Jr., Shattil SJ, et al, eds. Hoffman Hematology: Basic Principles and Practice. 5th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2008:chap 127.
Kessler C. Hemorrhagic disorders: Coagulation factor deficiencies. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 180.
Reviewed ByReview Date: 02/28/2011
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
no serum has no fibrinogen
fibrinogen to fibrin.
Fibrinogen is important for the blood coagulation.
The fibrinogen test aids in the diagnosis of suspected clotting or bleeding disorders caused by fibrinogen abnormalities.
fibrinogen plays an important role in clotting factor. if the increase of fibrinogen can cause stroke to most patients because it can cause blockage to a vein or artery,then surely a low fibrinogen level can possibly cause hemorrhage, the blood will be diluted without this fibrinogen.
fibrinogen is needed for platelet aggregation. A patient with a severe deficiency of fibrinogen may have difficulty forming a primary hemostatic plug.
Thrombin cleaves fibrinogen to form fibrin.
Fibrinogen is a soluble protein found in the blood plasma. It is reduced to fibrin by the action of the enzyme thrombin.
The coagulation protein thrombin reacts with fibrinogen to form fibrin
Fibrinogen
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Plasma is the liquid portion of blood. Plasma without fibrinogen is called serum.