Serum Fibrinogen Concentration (Mass Concentration)

Your doctor may order a fibrinogen blood test if you have unusual or excessive bleeding, bruise easily, or are being checked for a possible blood clot. It is often used to help evaluate conditions such as disseminated intravascular coagulation (DIC), liver disease, abnormal bleeding, or an unexplained prolonged prothrombin time (PT) or partial thromboplastin time (PTT). It may also be done as part of testing before certain procedures.

Your healthcare provider may order this test to check for blood clotting disorders, monitor treatment for conditions like liver disease or kidney problems, or evaluate bleeding risks before surgery. It can also help assess how well your body is producing proteins involved in clotting.

In most cases, no special preparation is needed, and you can usually eat and drink as normal before the test. Tell your healthcare provider about all medicines, vitamins, and supplements you take, because drugs such as blood thinners, hormone medicines, or certain anti-inflammatory drugs can affect fibrinogen levels. Follow any specific instructions your provider gives you.

You may be asked to fast for a few hours before the test, but this isn’t always required. Bring any medications you’re taking to your appointment. Avoid smoking for at least 30 minutes before the blood draw.

A healthcare professional will draw a small blood sample from a vein, usually in your arm. The site is cleaned with an antiseptic, a band is placed around your upper arm to make the vein easier to see, and a needle is inserted to collect blood into a tube. You may feel a quick sting or pinch. The sample is then sent to a laboratory, and the entire procedure usually takes only a few minutes.

A small needle will be inserted into a vein in your arm. Blood will be collected into a tube. The process usually takes a few minutes, and you may feel a brief pinch. You’ll be able to resume normal activities afterward.

Normal fibrinogen levels in adults generally fall between about 200 and 400 milligrams per deciliter (mg/dL), though reference ranges can vary slightly by laboratory. Low levels may point to a bleeding disorder, severe liver disease, DIC, or heavy use of the body's clotting factors. High levels are often associated with inflammation, infection, tissue injury, or a higher risk of blood clots. Your provider will interpret your results together with your symptoms and other test findings.

Results are typically reported in grams per deciliter (g/dL). Lower levels may indicate conditions like liver disease or severe bleeding disorders, while very high levels could suggest inflammation or other health issues. Your provider will interpret results in the context of your overall health.