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6346: Homovanillic Acid (hva), Random Urine Print View
Homovanillic Acid, Rand U     mg/g creat 
Creatinine, Random Urine     mg/dL 

PRIMARY
1 Urine HCL Additive 10 (5) mL   Refrigerated - 7 Day(s)/Room Temperature - 7 Day(s)/Frozen - 28 Day(s)  
ALTERNATE
  Urine   Refrigerated - 7 Day(s)/Frozen - 28 Day(s)/Room Temperature - 7 Day(s)  

HVA (Homovanillic Acid) is a metabolite of the biogenic amine, dopamine. Monitoring of HVA levels is useful in confirming parkinsonism, monitoring therapeutic response to L-Dopa treatment, and in combination with VMA determinations, diagnosing persons afflicted with neuroblastoma, pheochromocytoma or other "neutral crest" tumors

10 mL urine: pH adjusted to <3.0 using 6N HCl.
Urine without preservative is acceptable if pH is below 6 and the
sample is shipped frozen.

Patient Preparation
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.
Setup Schedule
Tuesday, Friday

Reported (Analytical Time)
3 days

CPT Codes
83150,82570

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Notes
Reject Criteria: pH >3.0 and received unfrozen Transport Temperature: Preserved urine: Room temperature Unpreserved urine: Frozen Methodology: High Performance Liquid Chromatography, Electrochemical Detection






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