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Test Code FIBTP Fibrinogen, Plasma

Secondary ID


Useful For

Detecting increased or decreased fibrinogen (factor I) concentration of acquired or congenital origin


Monitoring severity and treatment of disseminated intravascular coagulation and fibrinolysis

Method Name

Coagulometric (Turbidimetric)

Reporting Name

Fibrinogen, P

Specimen Type

Plasma Na Cit

Specimen Required

Specimen Type: Platelet-poor plasma

Collection Container/Tube: Light-blue top (3.2% sodium citrate)

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions: Spin down, remove plasma and spin plasma again.

Additional Information: Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Plasma Na Cit Frozen (preferred) 14 days
  Ambient  24 hours

Reject Due To


Mild OK; Gross reject


Mild OK; Gross OK


Mild OK; Gross OK



Clinical Information

Fibrinogen, also known as factor I, is a plasma protein that can be transformed by thrombin into a fibrin gel ("the clot"). Fibrinogen is synthesized in the liver and circulates in the plasma as a disulfide-bonded dimer of 3 subunit chains. The biological half-life of plasma fibrinogen is 3 to 5 days.


An isolated deficiency of fibrinogen may be inherited as an autosomal recessive trait (afibrinogenemia or hypofibrinogenemia) and is one of the rarest of the inherited coagulation factor deficiencies.


Acquired causes of decreased fibrinogen levels include: acute or decompensated intravascular coagulation and fibrinolysis (disseminated intravascular coagulation: DIC), advanced liver disease, L-asparaginase therapy, and therapy with fibrinolytic agents (eg, streptokinase, urokinase, tissue plasminogen activator).


Fibrinogen function abnormalities, dysfibrinogenemias, may be inherited (congenital) or acquired. Patients with dysfibrinogenemia are generally asymptomatic. However, the congenital dysfibrinogenemias are more likely than the acquired to be associated with bleeding or thrombotic disorders. While the dysfibrinogenemias are generally not associated with clinically significant hemostasis problems, they characteristically produce a prolonged thrombin time clotting test.


Acquired dysfibrinogenemias mainly occur in association with liver disease (eg, chronic hepatitis, hepatoma) or renal diseases (eg, chronic glomerulonephritis, hypernephroma) and usually are associated with elevated fibrinogen levels.


Fibrinogen is an acute phase reactant, so a number of acquired conditions can result in an increase in its plasma concentration:

-Acute or chronic inflammatory illnesses

-Nephrotic syndrome

-Liver disease and cirrhosis

-Pregnancy or estrogen therapy

-Compensated intravascular coagulation




The finding of an increased level of fibrinogen in a patient with obscure symptoms suggests an organic rather than a functional condition. Chronically increased fibrinogen has been recognized as a risk factor for development of arterial thromboembolism.

Reference Values

200-393 mg/dL


Fibrinogen may be decreased in acquired conditions such as liver disease and acute intravascular coagulation and fibrinolysis and disseminated intravascular coagulation (ICF/DIC).


Fibrinogen may be decreased in rare conditions including congenital afibrinogenemia or hypofibrinogenemia.


Fibrinogen may be elevated with acute or chronic inflammatory conditions.

Clinical Reference

Mackie IJ, Kitchen S, Machin SJ, Lowe GD: Haemostais and Thrombosis Task Force of the British Committee for standards in Haematology. Guidelines for fibrinogen assays. Br J Haemotol 2003;121:396-304

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Analytic Time

Same day/1 day

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FIBTP Fibrinogen, P In Process


Result ID Test Result Name Result LOINC Value
FIBTP Fibrinogen, P 3255-7