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The factor V assay is a blood test to measure the activity of factor V -- one of the substances involved in blood clotting (coagulation).
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 area 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 testNo special preparation is needed.
How the test will feelWhen the needle is inserted to draw blood, you may feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performedThis test is used to find the cause of too much bleeding (decreased blood clotting).
Normal ValuesThe value is normally 50 - 200% of the laboratory control or reference value.
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What abnormal results meanDecreased factor V activity may be related to:
- Deficiency of factor V that is present at birth (congenital)
- Disseminated intravascular coagulation (DIC)
- Liver disease(such as cirrhosis)
- Primary fibrinolysis
Veins and arteries vary in size from one patient 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 light-headed
- 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.
Special considerationsWhen you bleed, the body launches a series of activities that help the blood clot. This is called the coagulation cascade. The process involves special proteins called coagulation factors (factor V is a coagulation factor).
Each factor's reaction triggers the next reaction. The final product of the coagulation cascade is the blood clot. Blood clots may not form normally if any one of the clotting factors is abnormally low.
ReferencesKessler C. Hemorrhagic disorders: Coagulation factor deficiencies. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 180.
What else can I help you with?
What has the author V S Dillon written?
V. S. Dillon has written: 'Assay practice on the Witwatersrand' -- subject(s): Assaying, Gold
Can you get a tattoo if you have factor v?
NO
What is the factor of v-921?
v - 921 is in its simplest form.
What year letter v silver assay mark?
The letter "V" as a silver assay mark typically indicates that the piece was assayed in the year 1886. This mark is associated with the British system of silver hallmarks, where letters represent specific years within a designated cycle. Always verify with a reliable source or expert for the most accurate information regarding specific pieces.
How do you factor 96-20V V2?
(v - 8)(v - 12)
What are the ratings and certificates for Inside 'The Omega Factor' - 2005 V?
Inside 'The Omega Factor' - 2005 V is rated/received certificates of: UK:E
How do you factor 35v?
5*7*v
Can you catch factor five through iv use?
Factor V is genetic, not contagious.
How do you factor v3 plus 8?
(v + 2)(v^2 - 2v + 4)
Why you need to calculate ripple factor in terms of form factor?
Ripple factor and form factor both are inerrelated to each other since they represent the extent to which filtering is done(ripple) and rms value of ac is greater than the average value(form). ripple factor=Vr(p-p)/V(dc) form factor=V(rms)/V(av)--Jivan Nepali
How do you factor v to the power of 6 minus 64?
v^6 -64 = (v - 2)(v + 2)(v^2 - 2v + 4)(v^2 + 2v + 4)
How do you factor v to the second power minus twenyt-five?
v2 - 25 = (v + 5)(v - 5) [difference of two squares]
