Luteinizing hormone (LH) blood test

定义

The LH blood test measures the amount of luteinizing hormone (LH) in blood. LH is a hormone released by the 脑下垂体, located on the underside of the brain.

选择的名字

ICSH - blood test; Luteinizing hormone - blood test; Interstitial cell stimulating hormone - blood test

如何执行测试

A 需要血液样本.

How to Prepare for the Test

Your health care provider will ask you to temporarily stop medicines that may affect the test results. Be sure to tell your provider about all the medicines you take. 这些包括:

• 避孕药
• 激素疗法
• 睾酮
• 脱氢表雄酮(一种补充剂)

If you are a woman of childbearing age, the test may need to be done on a specific day of your menstrual cycle. Tell your provider if you have recently been exposed to radioisotopes, such as during a nuclear medicine test.

考试的感觉如何

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. 这很快就会消失.

为什么要进行测试

In women, an increase in LH level at mid-cycle causes release of eggs (ovulation). Your doctor will order this test to see if:

• You are ovulating, when you are having trouble getting pregnant or have periods that are not regular
• You have reached menopause

If you are a man, the test may be ordered if you have signs of infertility or lowered sex drive. The test may be ordered if you have signs of a 脑下垂体 问题.

正常的结果

Normal results for adult women are:

• Before menopause: 5 to 25 IU/L
• Level peaks even higher around the middle of the menstrual cycle
• Level then becomes higher after menopause: 14.2 to 52.3 IU / L

LH levels are normally low during childhood.

Normal result for men over 18 years of age is around 1.8 to 8.6 IU / L.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test result.

异常结果意味着什么

In women, a higher than normal level of LH is seen:

• When women of childbearing age are not ovulating
• When there is an imbalance of female sex hormones (such as with 多囊卵巢综合征)
• 在绝经期间或之后
• 特纳综合征 (rare genetic condition in which a female does not have the usual pair of 2 X chromosomes)
• When the ovaries produce little or no hormones (ovarian hypofunction)

In men, a higher than normal level of LH may be due to:

• Absence of testes or testes that do not function (无睾)
• Problem with genes, such as Klinefelter综合症
• Endocrine glands that are overactive or form a tumor (multiple endocrine neoplasia)

In children, a higher than normal level is seen in early (早熟的青春期).

A lower than normal level of LH may be due to the 脑下垂体 not making enough hormone (垂体机能减退).

风险

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

• 大出血
• Fainting or feeling lightheaded
• Multiple punctures to locate veins
• Hematoma (blood accumulating under the skin)
• Infection (a slight risk any time the skin is broken)

参考文献

Jeelani R, Bluth MH. Reproductive function and pregnancy. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24日艾德. Philadelphia, PA: Elsevier; 2022:chap 26.

洛沃拉. Infertility: etiology, diagnostic evaluation, management, prognosis. In: Gershenson DM, Lentz GM, Valea FA, 洛沃拉, eds. 全面的妇科. 8日艾德. Philadelphia, PA: Elsevier; 2022:chap 40.