1. Patients should not eat avocados, bananas, butternuts, cantaloupe, dates, eggplant, grapefruit, hickory nuts, honeydew melon, kiwifruit, melon, nuts, pecans, pineapple, plantains, plums, tomatoes, or walnuts, which are high in serotonin for 48 hours before and during collection. 

2. Patient should discontinue medications that may elevate urine serotonin concentration including lithium, monoamine oxidase inhibitors, methyldopa, morphine, and reserpine. Patient should discontinue use of selective serotonin reuptake inhibitors (SSRI eg, PROZAC), which can lead to depletion of platelet serotonin levels and result in false-negative serotonin results

Serum

Centrifuge as soon as blood has clotted and aliquot serum into plastic vial.

Frozen - 90 days
Refrigerated (Preferred)- 21 days
Room temperature - 4 days

84260 - Serotonin (EAP 30021123)