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.
Extreme values: for hemoglobin, hemoglobin ≤ 2 g/dl; for body mass index (BMI), height ≤ 120 cm or weight > 90 kg; for trimester, gestational age (as determined by last menstrual period) < 5 weeks or > 42 weeks.
