Serum serotonin level Serotonin is a chemical produced by nerve
cells. The serum serotonin level is a blood test to measure the
amount of serotonin in your body. 5-HT level;
5-hydroxytryptamine level; Serotonin test How the test is
performed Blood is most often drawn from a vein. The vein
usually used is on the inside of the elbow or the back of the
hand. The procedure is done in the following way: - The site is
cleaned with germ-killing medicine (antiseptic). - The health
care provider wraps an elastic band around the upper arm to
apply pressure to the area and make the vein swell with blood. -
A needle is gently inserted into the vein. - The blood collects
into an airtight vial or tube attached to the needle. - The
elastic band is removed. - The needle is removed. - The puncture
site is covered with an adhesive strip to stop any bleeding. For
infants or young children, a sharp tool called a lancet may be
used to puncture the skin and make it bleed. The blood collects
into a small glass tube called a pipette