&lt;h2&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;Overview&lt;/strong&gt;&lt;/span&gt;&lt;/h2&gt;
&lt;p&gt;&lt;span style=&quot;color: #808080;&quot;&gt;Cholecystokinin (CCK) is a peptide hormone crucial in digestion regulation and appetite control. It&#39;s synthesized in the duodenum and jejunum of the small intestine, as well as in the neurons of the gastrointestinal tract and brain. CCK secretion is stimulated by the presence of fatty acids and amino acids in the small intestine, triggering various physiological responses. Its primary functions include stimulating the release of digestive enzymes from the pancreas and bile from the gallbladder, promoting satiety by acting on the brain&#39;s appetite centers and modulating gastrointestinal motility. &lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;p&gt;&lt;span style=&quot;color: #808080;&quot;&gt;CCK also plays a role in various physiological processes beyond digestion, such as pain perception, anxiety, and memory consolidation. Dysregulation of CCK signaling has been implicated in several digestive disorders, including gallstones and functional gastrointestinal disorders.&lt;/span&gt;&lt;/p&gt;
&lt;hr /&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;h3&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;METHOD NAME&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;Direct Radioimmunoassay (RIA)&lt;/span&gt;&lt;/p&gt;
&lt;h3&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;&lt;br /&gt;AVAILABILITY&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;&lt;span style=&quot;color: #808080;&quot;&gt;TBC&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;h3&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;REPORTING NAME&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;&lt;span style=&quot;color: #808080;&quot;&gt;Cholecystokinin (CCK)&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;h3&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;OTHER NAMES&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;&lt;span style=&quot;color: #808080;&quot;&gt;Cholechstokinin (CCK)&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;

&lt;h3 id=&quot;SpecimenType-title&quot;&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;SPECIMEN TYPE&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;&lt;span style=&quot;color: #808080;&quot;&gt;GI Plasma&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;h3&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;SHIPPING INSTRUCTIONS&lt;br /&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p&gt;&lt;span style=&quot;color: #808080;&quot;&gt;TBC&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;h3&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;SPECIMEN REQUIRED&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;&lt;strong&gt;Patient Preparation:&amp;nbsp;&lt;/strong&gt;The patient should fast for 10 to 12 hours before collection of specimens. Antacid medications and medications that affect intestinal motility should be discontinued, if possible, for at least 48 hours before collection of specimens.&lt;/span&gt;&lt;/p&gt;
&lt;p style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;&lt;strong&gt;Supplies:&lt;/strong&gt;&amp;nbsp;MCL Supply T125&lt;/span&gt;&lt;/p&gt;
&lt;p style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;&lt;strong&gt;Container/Tube:&lt;/strong&gt;&amp;nbsp;Special tube containing G.I. preservative&amp;nbsp;(MCL Supply T125)&lt;/span&gt;&lt;/p&gt;
&lt;p style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;&lt;strong&gt;Specimen Volume:&amp;nbsp;&lt;/strong&gt;3&amp;nbsp;mL&lt;/span&gt;&lt;/p&gt;
&lt;p style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #33cccc;&quot;&gt;&lt;strong&gt;Collection Instructions:&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ol&gt;
&lt;li style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;The patient should fast for 10 to 12 hours before collection.&lt;/span&gt;&lt;/li&gt;
&lt;li style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;Collect 10 mL of blood in a special GI preservative tube.&lt;/span&gt;&lt;/li&gt;
&lt;li style=&quot;font-weight: 400;&quot;&gt;&lt;span style=&quot;color: #808080;&quot;&gt;Specimens should be separated immediately, plasma frozen as soon as possible and shipped.&lt;/span&gt;&lt;/li&gt;
&lt;/ol&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;