| lh | <chemical> A small glycoprotein hormone secreted by the anterior pituitary. Lh plays an important role in controlling ovulation and in controlling secretion of hormones by the ovaries and testes. Chemical name: Luteinizing hormone (12 Dec 1998) |
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| LH and RH agonist | <pharmacology> Particular medications that act as potent inhibitors of gonadotrophin (testosterone) secretion. They act to inhibit the production of testosterone through a feedback mechanism on the pituitary gland. LH and RH agonists are useful in the treatment of prostate cancer. (14 Oct 1997) |
| LH assay | A blood test which measures the amount of luteinising hormone (LH). LH is a protein hormone that is secreted by the anterior pituitary gland. In women, a surge in LH at midcycle causes ovulation. For the next 7-10 days LH maintains the corpus luteum which synthesises progesterone. The corpus luteum disintegrates after about 10 days if fertilization does not occur. In men, LH stimulates production of testosterone by the Leydig cells in the testes. This test may be used to evaluate anovulatory bleeding, infertility, ovarian cysts and multiple endocrine neoplasia (MEN) I. Normal values in males: 7 to 24 U/L. Normal values in females: greater than 6-30 U/L. Greater than normal values can indicate: anorchia, hypogonadism, Klinefelter syndrome, menopause, ovarian failure, polycystic ovary disease, precocious puberty and Turner's syndrome. Lower than normal values can indicate hypopituitarism. (27 Sep 1997) |
| lh response to gnrh | This test measures the level of luteinising hormone in the blood after an injection of gonadotrophin releasing hormone (GNRH), normally produced in the hypothalamus. This will test the ability of the pituitary gland to respond by measuring one of the pituitary glands byproducts, luteinising hormone. This test is used to differentiate hypogonadism (ovary or testes) into primary hypogonadism (problem is with the ovary or testes) or secondary hypogonadism (problem is with the pituitary gland or the hypothalamus). (27 Sep 1997) |
| lh surge | The sudden release of luteinising hormone (LH) that causes the follicle to release a mature egg. (09 Oct 1997) |
| LH-RF | <abbreviation> Luteinizing hormone-releasing factor. (05 Mar 2000) |
| LH-RH | <abbreviation> Luteinizing hormone-releasing hormone. (05 Mar 2000) |
| LH-RH degrading endopeptidase | <enzyme> Cleaves preferentially at tyr-gly bond Registry number: EC 3.4.99.- (26 Jun 1999) |
| LH/FSH-RF | <abbreviation> Luteinizing hormone/follicle-stimulating hormone-releasing factor. (05 Mar 2000) |
| LH2O | The heat (Btu) needed to vapourise and superheat one pound of water. (05 Dec 1998) |
| Lhermitte's sign | <clinical sign> Sudden electric-like shocks extending down the spine on flexing the head. (05 Mar 2000) |
| Lhermitte, Jean | <person> French neurologist, 1877-1959. See: Lhermitte's sign. (05 Mar 2000) |
| lherzolite | <chemical> An igneous rock consisting largely of chrysolite, with pyroxene and picotite (a variety of spinel containing chromium). Origin: From Lherz, a place in the Pyrenees. Source: Websters Dictionary (01 Mar 1998) |
| lhrh agonists | Compounds that are similar to LHRH (luteinizing hormone-releasing hormone). (12 Dec 1998) |