Peripheral relaxin levels during pregnancy in a woman with homozygous familial hypobetalipoproteinemia**Supported in part by grants HD22338 to G.W., HD22969 to C.R.P., and HL28399 and RR334 to D.R.I., from the National Institutes of Health, Bethesda, Maryland

Viable term pregnancy despite "subluteal" serum progesterone levels in the first trimester

This is a report of a 34-year-old patient with a 3-year history of unexplained infertility, who conceived after IVF-ET. Her serum P levels were < 2.0 ng/mL (conversion factor to SI unit, 3.180) between 5 and 6 weeks of gestation. She subsequently delivered a viable infant at term.