Summary
The plasma tissue factor (TF) concentration was correlated to factor VII concentration
(FVIIag) and factor VII activity (FVIIc) in 498 healthy volunteers ranging in age
from 17 to 64 years. Immunoassays using monoclonal antibodies (mAbs) were developed
for the determination of TF and FVIIag in plasma. The mAbs and the test systems were
characterized. The mean value of the TF concentration was 172 ± 135 pg/ml. TF showed
no age- and gender-related differences. For the total population, FVIIc, determined
by a clotting test, was 110 ± 15% and the factor VIlag was 0.77 ± 0.19 μg/ml. FVII
activity was significantly increased with age, whereas the concentration demonstrated
no correlation to age in this population. FVII concentration is highly correlated
with the activity as measured by clotting assay using rabbit thromboplastin. The ratio
between FVIIc and FVIIag was not age-dependent, but demonstrated a significant difference
between men and women. Between TF and FVII we could not detect a correlation.