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</div><div><span>LH response to GnRH blood test</span></div></div>
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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">LH response to GnRH blood test</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>LH response to GnRH is a blood test to help determine if your pituitary gland can correctly respond to gonadotropin releasing hormone (GnRH). LH stands for luteinizing hormone.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>A <a test="test" href="./003423.htm">blood sample is taken</a>, and then you are given a shot of GnRH. After a specified time, more blood samples are taken so that <a test="test" href="./003708.htm">LH</a> can be measured.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>No special preparation is necessary.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>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. This soon goes away.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>GnRH is a hormone made by the hypothalamus gland. LH is made by the pituitary gland. GnRH causes (stimulates) the pituitary gland to release LH.</p><p>This test is used to tell the difference between primary and secondary <a test="test" href="./001195.htm">hypogonadism</a>. Hypogonadism is a condition in which the sex glands make little or no hormones. In men, the sex glands (gonads) are the testes. In women, the sex glands are the ovaries.</p><p>Depending on the type of hypogonadism:</p><ul><li><div>Primary hypogonadism starts in the testicle or ovary</div></li><li><div>Secondary hypogonadism starts in the hypothalamus or pituitary gland</div></li></ul><p>This test may also be done to check for the reason why there is a:</p><ul><li>Low <a test="test" href="./003707.htm">testosterone</a> level in men</li><li>Low <a test="test" href="./003711.htm">estradiol</a> level in women</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>An increased LH response suggests a problem in the ovaries or testes.</p><p>A reduced LH response suggests a problem with the hypothalamus gland or pituitary gland.</p><p>Abnormal results may also be due to:</p><ul><li>Pituitary gland problems, such as release of too much hormone (<a test="test" href="./003718.htm">hyperprolactinemia</a>) </li><li>Large <a test="test" href="./000704.htm">pituitary tumors</a></li><li>Decrease in hormones made by the <a test="test" href="./002351.htm">endocrine glands</a></li><li>Too much iron in the body (<a test="test" href="./000327.htm">hemochromatosis</a>)
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</li><li>Eating disorders, such as <a test="test" href="./000362.htm">anorexia</a></li><li>Recent significant weight loss, such as after bariatric surgery
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</li><li>Delayed or absent puberty (Kallmann syndrome)
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</li><li>Lack of periods in women (<a test="test" href="./001218.htm">amenorrhea</a>)
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</li><li>Obesity
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</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>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.</p><p>Other risks related to having blood drawn are slight, but may include:</p><ul><li>Excessive bleeding</li><li>Fainting or feeling lightheaded</li><li>Multiple punctures to locate veins</li><li>Hematoma (blood accumulating under the skin)</li><li>Infection (a slight risk any time the skin is broken) </li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Luteinizing hormone response to gonadotropin-releasing hormone</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Guber HA, Oprea M, Russell YX. Evaluation of endocrine function. In: McPherson RA, Pincus MR, eds. <em>Henry's Clinical Diagnosis and Management by Laboratory Methods</em>. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 25.</p><p>Kaiser U, Ho K. Pituitary physiology and diagnostic evaluation. In: Melmed S, Auchus, RJ, Goldfine AB, Koenig RJ, Rosen CJ, eds. <em>Williams Textbook of Endocrinology</em>. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 8.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 8/23/2023</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: LaQuita Martinez, MD, Department of Obstetrics and Gynecology, Emory Johns Creek Hospital, Alpharetta, GA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. </p>
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