High Performance Liquid Chromatography (HPLC); Electrochemical Detection
Urine, Timed Collection
Quest Diagnostics San Juan Capistrano
Tuesday and Friday
5-10 mL 24 Hour Urine
It is preferable for the patient to be off medications for three days prior to collection. However, common antihypertensives (diuretics, ACE inhibitors, 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. Store refrigerated during collection.
Room Temp=10 Days; Refrigerated=14 Days; Frozen=90 Days
Preserved urine received refrigerated with pH >3; Unpreserved urine received frozen with pH >6
10 mL 24 Hour Urine
5 mL 24 Hour 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 total volume and pH in comments, on specimen and on batch sheet.