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<div class="HwContainer HwElement" id="HwContainer"><a class="HwMainSkipNavigation" href="#HwContentTitle"><span class="HwAccessibilityText">Skip Navigation</span></a><div class="HwBlock" id="HwMain" role="main"><div class="HwRow"><div class="HwColumn" id="HwColumnSidebar1"><div class="HwCustom" id="HwCustomSidebar"> </div></div><div class="HwColumn" id="HwColumnContent"><div id="HwContentTop"> </div><div class="HwTypeMedicalTest HwContentWrapper HwElement" role="article" id="HwContentWrapper"><div class="HwCustom" id="HwCustomContentTop"> </div><div class="HwContentHeader"><p><a name="top" id="Hwtop"><span class="HwAccessibilityText">Top of the page</span></a> </p></div><div class="HwContentTitle"><h1 id="HwContentTitle" tabindex="-1">Phosphate in Blood Test</h1></div><div class="HwContentTopNavigation"> </div><div class="HwContent"><div class="HwNavigationSection HwSectionSpecialSection" id="sec-hw202268"><h2 class="HwSectionTitle" fingerprint="d4032d6d" fingerprint-exact="4fcae40e">Test Overview</h2> <p fingerprint="f6f0e427" fingerprint-exact="e0ea5cd9">A phosphate test measures the amount of <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="stp1399" data-hw-section="stp1399-sec" rel="Definition" hw:document-type="Definition" hw:document-href="stp1399" data-hwid="stp1399" hw:section-href="stp1399-sec" href="?id=stp1399#stp1399-sec"><span class="HwLinkText">phosphate</span></a> in a blood sample. Phosphate is a charged particle (ion) that contains the <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="stm15617" data-hw-section="stm15617-sec" rel="Definition" hw:document-type="Definition" hw:document-href="stm15617" data-hwid="stm15617" hw:section-href="stm15617-sec" href="?id=stm15617#stm15617-sec"><span class="HwLinkText">mineral</span></a> phosphorus. The body needs phosphorus to build and repair bones and teeth, help nerves function, and make muscles contract. Most (about 85%) of the phosphorus contained in phosphate is found in bones. The rest of it is stored in tissues throughout the body.</p> <p fingerprint="ef9791d8" fingerprint-exact="767795e1">The <a class="HwLinkMultiMedia" data-hw-type="MultiMedia" data-hw-document-href="tp10117" data-hw-section="tp10117-sec" rel="MultiMedia" hw:document-type="MultiMedia" hw:document-href="tp10117" data-hwid="tp10117" hw:section-href="tp10117-sec" hw:link-type="image" href="?id=tp10117#tp10117-sec"><span class="HwLinkText">kidneys</span></a> help control the amount of phosphate in the blood. Extra phosphate is filtered by the kidneys and passes out of the body in the urine. A high level of phosphate in the blood is usually caused by a kidney problem.</p> <p fingerprint="38b44983" fingerprint-exact="a66ede37">The amount of phosphate in the blood affects the level of <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="stc123615" data-hw-section="stc123615-sec" rel="Definition" hw:document-type="Definition" hw:document-href="stc123615" data-hwid="stc123615" hw:section-href="stc123615-sec" href="?id=stc123615#stc123615-sec"><span class="HwLinkText">calcium</span></a> in the blood. Calcium and phosphate in the body react in opposite ways: as blood calcium levels rise, phosphate levels fall. A hormone called parathyroid hormone (PTH) regulates the levels of calcium and phosphorus in your blood. When the phosphorus level is measured, a <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="stv5436" data-hw-section="stv5436-sec" rel="Definition" hw:document-type="Definition" hw:document-href="stv5436" data-hwid="stv5436" hw:section-href="stv5436-sec" href="?id=stv5436#stv5436-sec"><span class="HwLinkText">vitamin D</span></a> level, and sometimes a PTH level, is measured at the same time. Vitamin D is needed for your body to take in phosphate.</p> <p fingerprint="cd3d0a83" fingerprint-exact="94a70fbb">The relation between calcium and phosphate may be disrupted by some diseases or infections. For this reason, phosphate and calcium levels are usually measured at the same time.</p> </div><div class="HwNavigationSection HwSectionSpecialSection" id="sec-hw202274"><h2 class="HwSectionTitle" fingerprint="3d5095ef" fingerprint-exact="55cd7304">Why It Is Done</h2> <p fingerprint="b61c25c5" fingerprint-exact="33717993">This test may be done to check phosphate levels if you have kidney disease or bone disease. It helps find problems with certain glands, such as the parathyroid glands. The test is also used to find a cause for abnormal vitamin D levels.</p> </div><div class="HwNavigationSection HwSectionSpecialSection" id="sec-hw202281"><h2 class="HwSectionTitle" fingerprint="026e985e" fingerprint-exact="df1d0bbc">How To Prepare</h2> <p fingerprint="42f41e7b" fingerprint-exact="8ebc2fa5">Your doctor may ask you not to eat or drink anything other than water for at least 8 hours before the test.</p> </div><div class="HwNavigationSection HwSectionSpecialSection" id="sec-hw202283"><h2 class="HwSectionTitle" fingerprint="e59ce77f" fingerprint-exact="42dd83e2">How It Is Done</h2> <h3 class="HwSubSectionTitle" fingerprint="2856932f" fingerprint-exact="020df966">Blood test</h3> <p fingerprint="5aae0cd8" fingerprint-exact="a27baf64">A health professional uses a needle to take a blood sample, usually from the arm.</p> <h3 class="HwSubSectionTitle" fingerprint="ae8d0d32" fingerprint-exact="b698e861">Heel stick</h3> <p fingerprint="5c43e5dc" fingerprint-exact="fbc7a282">A heel stick is used to get a blood sample from a baby. The baby's heel is poked, and several drops of blood are collected. A baby may have a tiny bruise where the heel was poked.</p> <h3 class="HwSubSectionTitle" fingerprint="e8e51a40" fingerprint-exact="c98ab821">How long the test takes</h3> <p fingerprint="b36f8dc0" fingerprint-exact="15016754">This test will take a few minutes.</p> <h3 class="HwSubSectionTitle" fingerprint="ffd3beac" fingerprint-exact="500b4a26">Watch</h3> <div class="HwOptionalAll"> <div class="hwMediaLinks"> <ul fingerprint="2a924914" fingerprint-exact="939aff65"> <li class="HwOptionalAny"> <a class="HwLinkMultiMedia" data-hw-type="MultiMedia" data-hw-document-href="acj1944" data-hw-section="acj1944-sec" rel="MultiMedia" hw:document-type="MultiMedia" hw:document-href="acj1944" data-hwid="acj1944" hw:section-href="acj1944-sec" hw:link-type="video" href="?id=acj1944#acj1944-sec"><span class="HwLinkText">Learning About Your Blood Test</span><br><img class="HwMediaImage" data-hw-resource-path="media/thumbnails/acj1944_416x312.jpg" hw:resource-path="media/thumbnails/acj1944_416x312.jpg" src="https://ixbapi.healthwise.net/Resource/14.3/en-us/media/thumbnails/acj1944_416x312.jpg" width="416" height="312" alt hw:release-quarter="14.3"></a> </li> <li class="HwOptionalAny"> <a class="HwLinkMultiMedia" data-hw-type="MultiMedia" data-hw-document-href="aci5157" data-hw-section="aci5157-sec" rel="MultiMedia" hw:document-type="MultiMedia" hw:document-href="aci5157" data-hwid="aci5157" hw:section-href="aci5157-sec" hw:link-type="video" href="?id=aci5157#aci5157-sec"><span class="HwLinkText">Learning About Blood Tests for Children</span><br><img class="HwMediaImage" data-hw-resource-path="media/thumbnails/aci5157_416x312.jpg" hw:resource-path="media/thumbnails/aci5157_416x312.jpg" src="https://ixbapi.healthwise.net/Resource/14.3/en-us/media/thumbnails/aci5157_416x312.jpg" width="416" height="312" alt hw:release-quarter="14.3"></a> </li> </ul> </div> </div> </div><div class="HwNavigationSection HwSectionSpecialSection" id="sec-hw202288"><h2 class="HwSectionTitle" fingerprint="2dd5db50" fingerprint-exact="deba34d5">How It Feels</h2> <h3 class="HwSubSectionTitle" fingerprint="2856932f" fingerprint-exact="020df966">Blood test</h3> <p fingerprint="1ac94c75" fingerprint-exact="5d3995d8">When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch.</p> <h3 class="HwSubSectionTitle" fingerprint="ae8d0d32" fingerprint-exact="b698e861">Heel stick</h3> <p fingerprint="ffc9b238" fingerprint-exact="b02d0be8">A brief pain, like a sting or a pinch, is usually felt when the lancet punctures the skin. A baby may feel a little discomfort with the skin puncture.</p> </div><div class="HwNavigationSection HwSectionSpecialSection" id="sec-hw202290"><h2 class="HwSectionTitle" fingerprint="a566bce5" fingerprint-exact="1aacb8d8">Risks</h2> <h3 class="HwSubSectionTitle" fingerprint="2856932f" fingerprint-exact="020df966">Blood test</h3> <p fingerprint="f81952f3" fingerprint-exact="73b0e5b4">There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site.</p> <h3 class="HwSubSectionTitle" fingerprint="ae8d0d32" fingerprint-exact="b698e861">Heel stick</h3> <p fingerprint="dd057e9e" fingerprint-exact="e4d003af">There is very little risk of a problem from a heel stick. A baby may get a small bruise at the puncture site.</p> </div><div class="HwNavigationSection HwSectionSpecialSection" id="sec-hw202294"><h2 class="HwSectionTitle" fingerprint="9413e669" fingerprint-exact="9fa3e414">Results</h2> <h3 class="HwSubSectionTitle" fingerprint="7d152b4d" fingerprint-exact="218568e4">Normal</h3> <p fingerprint="22049f10" fingerprint-exact="465acd27">Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.</p> <p fingerprint="6a2e6314" fingerprint-exact="9fe85b0f">Phosphate levels are usually higher in children than in adults. That's because of the active bone growth occurring in children.</p> <h3 class="HwSubSectionTitle" fingerprint="43ad997f" fingerprint-exact="38685d68">High values</h3> <p fingerprint="e75faaf5" fingerprint-exact="3045dd7d">High phosphate levels may be caused by: </p> <div class="HwOptionalAll"> <ul fingerprint="1f0fcf07" fingerprint-exact="bf594b10"> <li class="HwOptionalAny">Some tumors such as <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="stl158014" data-hw-section="stl158014-sec" rel="Definition" hw:document-type="Definition" hw:document-href="stl158014" data-hwid="stl158014" hw:section-href="stl158014-sec" href="?id=stl158014#stl158014-sec"><span class="HwLinkText">lymphoma</span></a>. </li> <li class="HwOptionalAny">Kidney disease, underactive <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="stp1239" data-hw-section="stp1239-sec" rel="Definition" hw:document-type="Definition" hw:document-href="stp1239" data-hwid="stp1239" hw:section-href="stp1239-sec" href="?id=stp1239#stp1239-sec"><span class="HwLinkText">parathyroid glands</span></a> (hypoparathyroidism), <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="sta123097" data-hw-section="sta123097-sec" rel="Definition" hw:document-type="Definition" hw:document-href="sta123097" data-hwid="sta123097" hw:section-href="sta123097-sec" href="?id=sta123097#sta123097-sec"><span class="HwLinkText">acromegaly</span></a>, untreated <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="std120862" data-hw-section="std120862-sec" rel="Definition" hw:document-type="Definition" hw:document-href="std120862" data-hwid="std120862" hw:section-href="std120862-sec" href="?id=std120862#std120862-sec"><span class="HwLinkText">diabetic ketoacidosis</span></a>, or certain bone diseases. </li> <li class="HwOptionalAny">Too much <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="stv5436" data-hw-section="stv5436-sec" rel="Definition" hw:document-type="Definition" hw:document-href="stv5436" data-hwid="stv5436" hw:section-href="stv5436-sec" href="?id=stv5436#stv5436-sec"><span class="HwLinkText">vitamin D</span></a> in the body. </li> </ul> </div> <h3 class="HwSubSectionTitle" fingerprint="01f76001" fingerprint-exact="f73fd7e9">Low values</h3> <p fingerprint="dc0a016a" fingerprint-exact="8c28e2d8">Low phosphate levels may be caused by: </p> <ul fingerprint="9aec81ab" fingerprint-exact="33cf5ac2"> <li> <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="sth149981" data-hw-section="sth149981-sec" rel="Definition" hw:document-type="Definition" hw:document-href="sth149981" data-hwid="sth149981" hw:section-href="sth149981-sec" href="?id=sth149981#sth149981-sec"><span class="HwLinkText">Hyperparathyroidism</span></a>, certain bone diseases (such as <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="sto167518" data-hw-section="sto167518-sec" rel="Definition" hw:document-type="Definition" hw:document-href="sto167518" data-hwid="sto167518" hw:section-href="sto167518-sec" href="?id=sto167518#sto167518-sec"><span class="HwLinkText">osteomalacia</span></a>), lack of vitamin D, or some kidney or liver diseases. </li> <li>Severe malnutrition or starvation. </li> <li>A condition such as <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="sts15458" data-hw-section="sts15458-sec" rel="Definition" hw:document-type="Definition" hw:document-href="sts15458" data-hwid="sts15458" hw:section-href="sts15458-sec" href="?id=sts15458#sts15458-sec"><span class="HwLinkText">sprue</span></a> that prevents the intestines from absorbing nutrients properly. </li> <li> <a class="HwLinkDefinition" data-hw-type="Definition" data-hw-document-href="ty7092" data-hw-section="ty7092-sec" rel="Definition" hw:document-type="Definition" hw:document-href="ty7092" data-hwid="ty7092" hw:section-href="ty7092-sec" href="?id=ty7092#ty7092-sec"><span class="HwLinkText">Alcohol use disorder</span></a>. </li> <li>High calcium levels. </li> <li>Some types of tumors. </li> </ul> </div><div class="HwNavigationSection HwSectionRelatedInformation" id="sec-hw202265-RelInfo"><h2 class="HwSectionTitle" fingerprint="d5f858e0" fingerprint-exact="c0ffe04b">Related Information</h2><ul fingerprint="b9e4c422" fingerprint-exact="a99b4942"><li class="HwOptionalAny"><a data-hw-type="MedicalTest" data-hw-document-href="hw3833" data-hw-section="hw3836" hw:document-type="MedicalTest" hw:document-href="hw3833" data-hwid="hw3833" hw:section-href="hw3836" href="?id=hw3833#hw3836">Calcium (Ca) in Blood Test</a></li><li class="HwOptionalAny"><a data-hw-type="MedicalTest" data-hw-document-href="hw27965" data-hw-section="hw27968" hw:document-type="MedicalTest" hw:document-href="hw27965" data-hwid="hw27965" hw:section-href="hw27968" href="?id=hw27965#hw27968">Calcium (Ca) in Urine Test</a></li><li class="HwOptionalAny"><a data-hw-type="Focus" data-hw-document-href="zm2257" data-hw-section="zm2257-sec" hw:document-type="Focus" hw:document-href="zm2257" data-hwid="zm2257" hw:section-href="zm2257-sec" href="?id=zm2257#zm2257-sec">Medical Tests: Questions to Ask the Doctor</a></li><li class="HwOptionalAny"><a data-hw-type="MedicalTest" data-hw-document-href="hw202342" data-hw-section="hw202345" hw:document-type="MedicalTest" hw:document-href="hw202342" data-hwid="hw202342" hw:section-href="hw202345" href="?id=hw202342#hw202345">Phosphate in Urine Test</a></li></ul></div><div class="HwNavigationSection HwCreditsSection HwSectionCredits" id="sec-hw202265-Credits"><h2 class="HwSectionTitle">Credits</h2><div class="HwContentInformation"><div class="HwLastUpdated"><p><span class="HwInfoLabel">Current as of: </span> April 30, 2024</p></div><div class="HwCredits"><p><span class="HwInfoLabel">Author: </span><a class="HwLinkExternal" 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