Prothrombin deficiency
Hypoprothrombinemia; Factor II deficiency; DysprothrombinemiaProthrombin deficiency is a disorder caused by a lack of a protein in the blood called prothrombin. It leads to problems with blood clotting (coagulation). Prothrombin is also known as factor II (factor two).
Causes
When you bleed, a series of reactions take place in the body that helps blood clots form. This process is called the coagulation cascade. It involves special proteins called coagulation, or clotting, factors. You may have a higher chance of excess bleeding if one or more of these factors are missing or are not functioning like they should.
Prothrombin, or factor II, is one such coagulation factor. Prothrombin deficiency runs in families (inherited) and is very rare. Both parents must have the gene to pass the disorder on to their children. A family history of a bleeding disorder can be a risk factor.
Prothrombin deficiency can also be due to another condition or use of certain medicines. This is called acquired prothrombin deficiency. It can be caused by:
- Lack of vitamin K (some babies are born with vitamin K deficiency)
Vitamin K
Vitamin 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....
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Liver disease
The 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 - Use of medicines that prevent clotting (anticoagulants such as warfarin)
Symptoms
Symptoms may include any of the following:
- Abnormal bleeding after childbirth
- Heavy menstrual bleeding
- Bleeding after surgery
- Bleeding after trauma
- Bruising easily
Bruising
Bleeding into the skin can occur from broken blood vessels that form tiny red dots (called petechiae). Blood also can collect under the tissue in la...
Read Article Now Book Mark Article - Nosebleeds that do not stop easily
- Umbilical cord bleeding after birth
Exams and Tests
Tests that may be done include:
- Factor II assay
Factor II assay
The factor II assay is a blood test to measure the activity of factor II. Factor II is also known as prothrombin. This is one of the proteins in th...
Read Article Now Book Mark Article - Partial thromboplastin time (PTT)
Partial thromboplastin time
Partial thromboplastin time (PTT) is a blood test that looks at how long it takes for blood to clot. It can help tell if you have a bleeding problem...
Read Article Now Book Mark Article - Prothrombin time (PT)
Prothrombin time
Prothrombin time (PT) is a blood test that measures the time it takes for the liquid portion (plasma) of your blood to clot. It measures the functio...
Read Article Now Book Mark Article - Mixing study (a special PTT test to confirm prothrombin deficiency)
Treatment
Bleeding can be controlled by getting intravenous (IV) infusions of plasma or concentrates of clotting factors. If you lack vitamin K, you can take this vitamin by mouth, through injections under the skin, or through a vein (intravenously).
If you have this bleeding disorder, be sure to:
- Tell your health care providers before you have any kind of procedure, including surgery and dental work.
- Tell your family members because they may have the same disorder but do not know it yet.
Support Groups
More information and support for people with Factor VII deficiency and their families can be found at:
- National Hemophilia Foundation -- www.hemophilia.org/community-resources
- NIH Genetic and Rare Diseases Information Center -- rarediseases.info.nih.gov/diseases/2926/prothrombin-deficiency
Outlook (Prognosis)
The outcome is good with proper treatment.
Inherited prothrombin deficiency is a lifelong condition.
The outlook for acquired prothrombin deficiency depends on the cause. If it is caused by liver disease, the outcome depends on how well your liver disease can be treated. Taking vitamin K supplements will treat vitamin K deficiency.
Possible Complications
Severe bleeding in the organs can occur.
When to Contact a Medical Professional
Get emergency treatment right away if you have unexplained or long-term blood loss, or if you cannot control the bleeding.
Prevention
There is no known prevention for inherited prothrombin deficiency. When a lack of vitamin K is the cause, using vitamin K supplements can help.
References
Gailani D, Benjamin TF, Wheeler AP. Rare coagulation factor deficiencies. In: Hoffman R, Benz EJ, Silberstein LE, Heslop HE, Weitz JI, Salama ME, et al, eds. Hematology: Basic Principles and Practice. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 135.
Hall JE, Hall ME. Hemostasis and blood coagulation. In: Hall JE, Hall ME, eds. Guyton and Hall Textbook of Medical Physiology. 14th ed. Philadelphia, PA: Elsevier; 2021:chap 37.
Ragni MV. Hemorrhagic disorders: coagulation factor deficiencies. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 165.
Blood clot formation - illustration
Blood clotting normally occurs when there is damage to a blood vessel. Platelets immediately begin to adhere to the cut edges of the vessel and release chemicals to attract even more platelets. A platelet plug is formed, and the external bleeding stops. Next, small molecules, called clotting factors, cause strands of blood-borne materials, called fibrin, to stick together and seal the inside of the wound. Eventually, the cut blood vessel heals and the blood clot dissolves after a few days.
Blood clot formation
illustration
Blood clots - illustration
Blood clots (fibrin clots) are the clumps that result when blood coagulates.
Blood clots
illustration
Blood clot formation - illustration
Blood clotting normally occurs when there is damage to a blood vessel. Platelets immediately begin to adhere to the cut edges of the vessel and release chemicals to attract even more platelets. A platelet plug is formed, and the external bleeding stops. Next, small molecules, called clotting factors, cause strands of blood-borne materials, called fibrin, to stick together and seal the inside of the wound. Eventually, the cut blood vessel heals and the blood clot dissolves after a few days.
Blood clot formation
illustration
Blood clots - illustration
Blood clots (fibrin clots) are the clumps that result when blood coagulates.
Blood clots
illustration
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.