Association of Fibrinogen and ROTEM parameters with age and race in a diverse pediatric population: a single center study.

Introduction: Rotational Thromboelastometry (ROTEM) is a whole blood viscoelastic analyzer providing a global assessment of coagulation. Reference Intervals (RIs) for ROTEM are limited in pediatrics, often not accounting for race. Moreover, discrete RIs may be misleading. Our objective was to investigate the relationship between age (as a continuous variable) and race on ROTEM and conventional coagulation tests (CCTs).

Methods: Prospective data from 105 racially diverse pediatric subjects (ages 1-21 years) were collected. ROTEM and CCTs (PT, aPTT and fibrinogen) were obtained. The cohort was analyzed as a whole and then stratified by race.

Results: There was a positive association with age and fibrinogen levels (R=0.189, p<0.0001), FIBTEM A10 (R=0.154, p=0.0001) and FIBTEM MCF (R=0.157, p=0.0001) in the entire cohort. For race stratification, only Black/African American (B/AA) subjects showed negative association with age for EXTEM CFT, but positive association for EXTEM/INTEM A10 and MCF ( p-value <0.001), and FIBTEM A10 and FIBTEM MCF (p-value <0.001), revealing a propensity for a prothrombotic state in B/AA.

Conclusion: This study reports race-specific, age-related differences in fibrinogen and ROTEM, and describes ROTEM parameters as continuous variables by age. Inclusion of a diverse population in establishing race-specific pediatric RIs has clinical and public health relevance for more accurate diagnosis and personalized treatment.