Yonsei Med J.  1999 Apr;40(2):107-111. 10.3349/ymj.1999.40.2.107.

Incidence and possible reasons for discordant results between positive FDP and negative D-dimer latex assays in clinical specimens

• Song KS
• Kim YA
• Kim HK
• Park Q

• KMID: 711622
• DOI: http://doi.org/10.3349/ymj.1999.40.2.107

Abstract

In general, FDP and D-dimer values have a correlation in clinical conditions associated with disseminated intravascular coagulation(DIC) or coagulation activation. However, there are some patients with discordant results who demonstrate elevated FDP and negative D-dimer results by latex agglutination assays. The incidence and possible reasons for the discordance between FDP and D-dimer results were investigated through simultaneous measurements (n = 763) from clinical patients with suspected DIC or coagulation activation. 24.8% (189/763) of samples with elevated FDP were negative for D-dimer assays by the latex agglutination method. Further detailed analysis on randomly-selected discordant samples (n = 41) revealed that the most common reason for the discordance was the lower sensitivity of the semiquantitative latex agglutination method for D-dimer, compared with quantitative enzyme or other latex immunoassay. The other contributing factors to the discordance were accelerated fibrinogenolysis without secondary fibrinolysis, elevated soluble fibrin monomer and rheumatoid factor.

Keyword

FDP; D-dimer; discordance; fibrinogenolysis

MeSH Terms

Blood Coagulation Disorders/blood*
Disseminated Intravascular Coagulation/blood*
Fibrin Fibrinogen Degradation Products/analysis*
Human
Latex Fixation Tests*