High Performance Liquid Chromatography (HPLC); Electrochemical Detection
Quest Diagnostics San Juan Capistrano
Tuesday and Friday
5-10 mL Random Urine
It is preferable for the patient to be off medications for three days prior to collection. However, common antihypertensives (diuretics, ACD inhibitiors, calcium channel blockers (alpha and beta blockers) cause minimal or no interference. Patient should avoid alcohol, coffee, tea, tobacco and strenuous exercise prior to collection.
Room Temp=7 Days; Refrigerated=7 Days; Frozen=28 Days
pH > 3.0 and received unfrozen
10 mL Random Urine
5 mL Random Urine
pH adjusted to < 3.0 using 6N HCI. Urine without preservative is acceptable if pH is below 6 and the sample is shipped frozen. Indicate pH in comments, on specimen and on batch sheet.