Test includes creatinine.
Methodology: High Performance Liquid Chromatography (HPLC)
Specimen Requirements: Submit an entire 24-hour urine collection in a urine container supplied by Meadville Medical Center Laboratory. Store specimen at room temperature after collection. Add 25 mL of 6N HCL as preservative at start of collection. This preservative is intended to achieve a pH of below 3. Urine without preservative is acceptable if pH is below 6 and the sample is shipped frozen. Refer to “Patient Information” section in back of manual for patient handout explaining collection information for this test.
NOTE: 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.
Analytical Time: 3 days
Days Set Up: Tuesday, Thursday
83150 – Homovanillic acid (HVA)
82570 – Creatinine; other source