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Research Article

Measurement of fibrinogen-fibrin-related antigen in serum as aid to diagnosis of deep vein thrombosis in outpatients.

Br Med J 1975; 1 doi: (Published 15 February 1975) Cite this as: Br Med J 1975;1:367
  1. D A Tibbutt,
  2. C N Chesterman,
  3. M J Allington,
  4. E W Williams,
  5. T Faulkner


    A study of serum levels of fibrinogen-fibrin-related antigen (F.R.-antigen) in outpatients presenting with clinical features suggesting deep vein thrombosis was undertaken. A raised serum level of this antigen (greater than 12 mg/1) is strong evidence in favour of the diagnosis of deep vein thrombosis. It is virtually conclusive evidence if other known causes of a raised level of the antigen are absent. On the other hand, a normal serum level of F.R.-antigen does not exclude even extensive thrombosis, and other objective techniques are required to substantiate the diagnosis.