Homovanillate Urine 24 Hour
Ordering Info & Methodology
Test Code
Cerner Synonyms
HVAU
Homovanillic Acid Urine Quantitative, Homovanillic Acid
Turn Around Time
Methodology
Ordering Guide
Add CRU, UTIM. Available on random urine (paediatrics only, requires approval) - use code HVAR.
Specimen Requirements
Sample Type
Collection Container
Alternate Collection Containers
Urine
Urine jug with 15 mL 6M HCl
If not collected in acid, acidify in lab, to pH 2 – 4, only if entire collection is received. Acidification must be performed within 12 hours after completion of 24 hr urine collection.
Add on stability
This is the length of time after sample collection that this analyte is stable. Test can be added to a previously collected sample if the time since collection is less than the add on stability time.
Minimum Volume
Add On Stability
Collection and Shipping Requirements
Aliquot 50 mL of a well mixed 24hr collection, refrigerate, send on ice pack.
Reference Intervals
Female Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
Male Reference Interval
Age Category | Reference Interval | units |
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Additional Notes
Measurement Uncertainty (MU)
Every laboratory value is an estimate of the true concentration of substance. MU is the 95% confidence interval around that estimate. 95% of the time, the true concentration will be within the range of the reported value ±MU. This value is based on analytical variability (precision) and does not reflect other factors such as sample collection and handling which may also affect the result.
Example
Reported sodium = 140 mmol/L
Sodium MU = 1%
Expanded uncertainty = 140 mmol/L ± 1% or 140mmol/L ± 1.4 mmol/L
Interpretation - the true value of sodium in the sample is in the range 138.6-141.4 mmol/L, with 95% confidence.
Measurement Uncertainty