Luteinizing hormone (LH) surge should replace last menstrual period (LMP) for improved accuracy of pregnancy dating

Effect of synthetic luteinizing hormone releasing hormone (LH/FSH-RH) in women with menstrual disorders.

Synthetic luteinizing hormone/follicle stimulating hormone-releasing hormone (LH/FSH-RH) (50 mug) was given intravenously to six women with oligomenorrhoea and to four women with secondary amenorrhoea. Peripheral venous blood was withdrawn at regular intervals over a 24-hour period. The concentrations of LH, FSH, and oestradiol-17beta were determined by radioimmunoassay. In all subjects there w...

Use of the last menstrual period (LMP) in timing human pregnancies.

Chemosensory Stimulation of Luteinizing Hormone (LH)

22 Male Siberian hamsters (Phodopus sungorus) housed in long days (LD), but not short 23 days (SD) release luteinizing hormone (LH) when exposed to females. This study examined 24 whether this response is specific to a female and identifies the source of a stimulus that induces 25 LH release. Serum concentrations of LH, testosterone (T), follicle stimulating hormone (FSH), 26 and cortisol were ...

Epidemiology of pregnancies with unknown last menstrual period

the Epidemiology of normal pregnancies with unknown last menstrual period (LMP) was studied in 1192 singleton  pregnancies.the LMP was unknown in 240(20.3%) pregnancies.unknown LMP is associated with high rates of low birth weight and all low socio-economic and socio-demographic status.such characteristics are also associated with a high rate of preterm deliveries.any possible bias introduced i...

Luteinizing hormone-releasing hormone neurons express Fos protein during the proestrous surge of luteinizing hormone.

The ability of luteinizing hormone-releasing hormone (LHRH) neurons to express the oncogene c-fos was examined during the estrous cycle in rats. The immunocytochemical localization of the c-fos-encoded antigen, Fos, was coupled with the immunocytochemical localization of LHRH. LHRH neurons showed no Fos immunoreactivity during diestrus-1, diestrus-2, estrus, or the morning of proestrus. However...