Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The range of reference values for the concentration of fibrinogen in individual trimesters of physiological pregnancy. Values determined in four groups (a–d) depending on the coexistence of risk factors (smoking and gestational diabetes mellitus; GDM). For Abbreviations, group definitions, and sample sizes, see Figure 3 legend.
