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Fibrinogen blood test

Definition:

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 Names:

Serum fibrinogen; Plasma fibrinogen; Factor I; Hypofibrinogenemia test



How the Test is Performed:

A sample of blood is needed.



How to Prepare for the Test:

No special preparation is needed.



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:

Your doctor may order this test if you have problems with blood clotting, such as excessive bleeding.



Normal Results:

The normal range is 200 to 400 mg/dL.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different specimens. Talk to your doctor about the meaning of your specific test results.



What Abnormal Results Mean:

Abnormal results may be due to:

The test may also be performed during pregnancy if the placenta separates from its attachment to the uterus wall (placenta abruptio ).



Risks:

There is very little risk involved with having your blood taken. Veins and arteries vary in size, so it may be harder to get a blood sample from one person than another.

Other risks or slight risks from having blood drawn may include:

  • Excessive bleeding
  • Fainting or feeling lightheaded
  • 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 disorders. The risk of excessive bleeding is slightly greater in such people than it is for those who do not have bleeding problems.



References:

Schmaier AH. Laboratory evaluation of hemostatic and thrombotic disorders. In: Hoffman R, Benz EJ Jr, Silberstein LE, Heslop HE, Weitz JI, Anastasi J, eds. Hematology: Basic Principles and Practice. 6th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 131.




Review Date: 1/27/2015
Reviewed By: Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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Morristown Medical Center

100 Madison Avenue
Morristown, NJ 07960
973-971-5000

Overlook Medical Center

99 Beauvoir Avenue
Summit, NJ 07901
908-522-2000

Newton Medical Center

175 High Street
Newton, NJ 07860
973-383-2121

Chilton Medical Center

97 West Parkway
Pompton Plains, NJ 07444
973-831-5000

Hackettstown Medical Center

651 Willow Grove Street
Hackettstown, NJ 07840
908-852-5100

Goryeb Children's Hospital

100 Madison Avenue
Morristown, NJ 07960
973-971-5000

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