&lt;h2&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;&lt;strong&gt;OVERVIEW&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;This method serves as both a primary and secondary screening tool for the initial diagnosis of catecholamine-secreting pheochromocytomas and paragangliomas. It can be used alongside or as an alternative to plasma metanephrines or plasma catecholamine testing.&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;hr /&gt;
&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;&lt;strong&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;METHOD NAME&lt;/span&gt;&lt;br /&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)&lt;/span&gt;&lt;/p&gt;
&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;&lt;strong&gt;AVAILABILITY&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;TBC&lt;/span&gt;&lt;/p&gt;
&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;&lt;strong&gt;REPORTING NAME&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
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&lt;div id=&quot;ReportingName-value&quot;&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;3-Methoxytyramine, 24h, U&lt;/span&gt;&lt;/div&gt;
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&lt;h2&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;&lt;strong&gt;OTHER NAME&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
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&lt;ul&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;3MT&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;3-methoxy-4-hydroxyphenethylamine&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Methoxytyramine&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Methoxytramine&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;3-Methoxytramine&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;3-Methoxytyramine&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Urine Dopamine&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
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&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2 id=&quot;SpecimenType-title&quot;&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;&lt;strong&gt;SPECIMEN TYPE&lt;/strong&gt;&amp;nbsp;&lt;/span&gt;&lt;/h2&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Urine&lt;/span&gt;&lt;/p&gt;
&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;&lt;strong&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;PATIENT PREPARATION&lt;/span&gt;&lt;br /&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Tricyclic antidepressants, labetalol, and sotalol can raise catecholamine levels, making interpretation difficult. Ideally, these medications should be stopped for at least 1 week before testing, if feasible. Levodopa (Sinemet) can also lead to false-positive results. Consultation with an endocrinology or hypertension specialist is recommended for guidance on managing medication risks and exploring alternatives.&lt;/span&gt;&lt;/p&gt;
&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;&lt;strong&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;SHIPPING INSTRUCTIONS&lt;/span&gt;&lt;br /&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
&lt;div class=&quot;flex flex-grow flex-col max-w-full&quot;&gt;
&lt;div class=&quot;min-h-[20px] text-message flex flex-col items-start whitespace-pre-wrap break-words [.text-message+&amp;amp;]:mt-5 juice:w-full juice:items-end overflow-x-auto gap-2&quot; dir=&quot;auto&quot; data-message-author-role=&quot;assistant&quot; data-message-id=&quot;43369f13-83b3-4263-b2f4-a5dbbea288d6&quot;&gt;
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&lt;div class=&quot;markdown prose w-full break-words dark:prose-invert dark&quot;&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;TBC&lt;/span&gt;&lt;/p&gt;
&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2&gt;&lt;span style=&quot;color: #ff99cc;&quot;&gt;&lt;strong&gt;SPECIMEN REQUIRED&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;&lt;strong&gt;Container/Tube:&amp;nbsp;&lt;/strong&gt;Plastic urine tube&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;&lt;strong&gt;Supplies:&lt;/strong&gt; Urine Tubes, 10 mL &lt;br /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;&lt;strong&gt;Specimen Volume:&amp;nbsp;&lt;/strong&gt;10 mL&lt;/span&gt;&lt;/p&gt;
&lt;p style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;&lt;strong&gt;Collection Instructions:&amp;nbsp;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ol&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;For patients with intermittent hypertension, it is preferable to conduct complete 24-hour urine collections starting at the onset of symptoms.&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Add 10 g (3 g for pediatric patients) of boric acid or 25 mL (15 mL for pediatric patients) of 50% acetic acid as a preservative at the beginning of the collection.&lt;/span&gt;&lt;/li&gt;
&lt;li&gt;&lt;span style=&quot;color: #99ccff;&quot;&gt;Collect urine continuously for 24 hours.&lt;/span&gt;&lt;/li&gt;
&lt;/ol&gt;
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&lt;/div&gt;

3-Methoxytyramine, 24 Hour, Urine