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<link rel="alternative" hreflang="en" href="https://medlineplus.gov/ency/article/000366.htm"/><meta property="og:title" content="Galactosemia: MedlinePlus Medical Encyclopedia"/><meta property="og:url" content="https://medlineplus.gov/ency/article/000366.htm"/><meta property="twitter:title" content="Galactosemia: MedlinePlus Medical Encyclopedia"/><meta name="twitter:card" content="summary_large_image"/><meta name="description" content="Galactosemia is a condition in which the body is unable to use (metabolize) the simple sugar galactose."/><meta itemprop="description" name="description" content="Galactosemia is a condition in which the body is unable to use (metabolize) the simple sugar galactose."/><meta property="og:description" content="Galactosemia is a condition in which the body is unable to use (metabolize) the simple sugar galactose."/><meta property="twitter:description" content="Galactosemia is a condition in which the body is unable to use (metabolize) the simple sugar galactose."/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_2.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_3.jpg"/><meta property="twitter:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/>
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</div><div><span>Galactosemia</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">Galactosemia</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Galactosemia is a condition in which the body is unable to use (<a test="test" href="./002257.htm">metabolize</a>) the simple sugar galactose.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Causes</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>Galactosemia is an inherited disorder. This means it is passed down through families. If both parents carry a nonworking copy of the gene that can cause galactosemia, each of their children has a 25% (1 in 4) chance of being affected with it.</p><p>There are 3 forms of the disease:</p><ul><li>Galactose-1 phosphate uridyl transferase (GALT) deficiency: Classic galactosemia, the most common and most severe form</li><li>Deficiency of galactose kinase (GALK)</li><li>Deficiency of galactose-6-phosphate epimerase (GALE)</li></ul><p>People with galactosemia are unable to fully break down the simple sugar galactose. Galactose makes up one half of lactose, the sugar found in milk.</p><p>If an infant with galactosemia is given milk, substances made from galactose build up in the infant's system. These substances damage the liver, brain, kidneys, and eyes.</p><p>People with galactosemia cannot tolerate any form of milk (human or animal). They must be careful about eating other foods containing galactose.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Symptoms</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>Infants with galactosemia may show symptoms in the first few days of life if they eat formula or breast milk that contains lactose. They may develop a serious blood infection with the bacteria <em>E coli</em>.</p><p>Symptoms of galactosemia are:</p><ul><li><a test="test" href="./003200.htm">Convulsions</a></li><li><a test="test" href="./003214.htm">Irritability</a></li><li><a test="test" href="./003088.htm">Lethargy</a></li><li>Poor feeding -- baby refuses to eat formula containing milk</li><li>Poor weight gain</li><li>Yellow skin and whites of the eyes (jaundice)</li><li>Vomiting</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Exams and Tests</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>Tests to check for galactosemia include:</p><ul><li><a test="test" href="./003744.htm">Blood culture</a> for bacterial infection (<em>E coli sepsis</em>)</li><li><a test="test" href="./002353.htm">Enzyme</a> activity in the red blood cells</li><li><a test="test" href="./003585.htm">Ketones in the urine</a></li><li>Prenatal diagnosis by directly measuring the enzyme <a test="test" href="./003636.htm">galactose-1-phosphate uridyl transferase</a></li><li>"Reducing substances" in the infant's urine, and normal or <a test="test" href="./000386.htm">low blood sugar</a> while the infant is being fed breast milk or a formula containing lactose</li></ul><p>In many states, newborn screening tests check for galactosemia.</p><p>Test results may show:</p><ul><li><a test="test" href="./003366.htm">Amino acids in the urine or blood plasma</a></li><li><a test="test" href="./003275.htm">Enlarged liver</a></li><li><a test="test" href="./000286.htm">Fluid in the abdomen</a></li><li><a test="test" href="./000386.htm">Low blood sugar</a></li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Treatment</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>People with this condition must avoid all milk, products that contain milk (including dry milk), and other foods that contain galactose, for life. Read product labels to make sure you or your child with the condition are not eating foods that contain galactose.</p><p>Infants can be fed:</p><ul><li>Soy formula</li><li>Another lactose-free formula</li><li>Meat-based formula or Nutramigen (a <a test="test" href="./002467.htm">protein</a> hydrolysate formula)</li></ul><p>Calcium supplements are recommended.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Support Groups</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>More information and support for people with galactosemia and their families can be found at:</p><p>Galactosemia Foundation -- <a class="extln" target="_blank" href="https://www.galactosemia.org">www.galactosemia.org</a></p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Outlook (Prognosis)</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>People who are diagnosed early and strictly avoid milk products and other foods that contain lactose can live a relatively normal life. However, mild mental impairment may develop, even in people who avoid galactose.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Possible Complications</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>These complications can develop:</p><ul><li><a test="test" href="./001001.htm">Cataracts</a></li><li><a test="test" href="./000255.htm">Cirrhosis</a> of the liver</li><li>Delayed speech development</li><li>Irregular menstrual periods, reduced function of ovaries leading to ovarian failure and infertility</li><li><a test="test" href="./001523.htm">Mental disability</a></li><li>Severe infection with bacteria (<em>E coli sepsis</em>)</li><li>Tremors (shaking) and uncontrollable motor functions</li><li>Death (if there is galactose in the diet)</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>When to Contact a Medical Professional</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-8"><p>Contact your health care provider if:</p><ul><li>Your infant has galactosemia symptoms</li><li>You have a family history of galactosemia and are considering having children</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Prevention</h2></div><div class="section-button"><button type="submit" aria-controls="section-9" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-9"><p>It is helpful to know your family history. If you have a family history of galactosemia and want to have children, genetic counseling will help you make decisions about pregnancy and prenatal testing. Once the diagnosis of galactosemia is made, genetic counseling is recommended for other members of the family.</p><p>Many states screen all newborns for galactosemia. If the newborn test shows possible galactosemia, they should contact the child's provider right away for advice about giving their infant milk products. They should also ask the provider about having blood tests that can be done to confirm a diagnosis of galactosemia.</p></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>Galactose-1-phosphate uridyl transferase deficiency; Galactokinase deficiency; Galactose-6-phosphate epimerase deficiency; GALT; GALK; GALE; Epimerase deficiency galactosemia; GALE deficiency; Galactosemia type III; UDP-galactose-4; Duarte variant</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/17187t.jpg" alt="Galactosemia" title="Galactosemia" class="side-img"/><a href="../imagepages/17187.htm">Galactosemia</a></li>
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</div></div><div class="section-body" id="section-Ref"><p>Bonnardeaux A, Bichet DG. Inherited disorders of the renal tubule. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. <em>Brenner and Rector's The Kidney</em>. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 44.</p><p>Broomfield A, Brain C, Grunewald S. Galactosaemia: diagnosis, management and long-term outcome. <em>Paediatrics and Child Health</em>. 2015:25(3);113-118. <a href="https://www.paediatricsandchildhealthjournal.co.uk/article/S1751-7222(14)00279-0/pdf" target="_blank">www.paediatricsandchildhealthjournal.co.uk/article/S1751-7222(14)00279-0/pdf</a>.</p><p>Husain AN, Koo SC. Diseases of infancy and childhood. In: Kumar V, Abbas AK, Aster JC, eds. <em>Robbins and Cotran Pathologic Basis of Disease</em>. 10th ed. Philadelphia, PA: Elsevier; 2021:chap 10.</p><p>Kishnani PS, Chen Y-T. Defects in metabolism of carbohydrates. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. <em>Nelson Textbook of Pediatrics</em>. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 105.</p><p>Pearl PL, DiBacco ML, Gibson KM. Inborn errors of metabolism and the nervous system. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. <em>Bradley and Daroff's Neurology in Clinical Practice</em>. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 91.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 4/24/2023</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: Anna C. Edens Hurst, MD, MS, Associate Professor in Medical Genetics, The University of Alabama at Birmingham, Birmingham, AL. Review provided by VeriMed Healthcare Network. 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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