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Ordering Info & Methodology

Test Code

Cerner Synonyms



Turn Around Time


Test performed Wednesday if sample received at St Paul’s Hospital before 10 am on Tuesday of that same week. Please verify specimen delivery to St Paul’s Hospital laboratory if collecting at another laboratory collection site.

Mass Spectrometry

Ordering Guide

Enter last dose time ITRTLD and date ITRDLD as free text.

Specimen Requirements

Sample Type

Collection Container

Alternate Collection Containers

Serum or EDTA Plasma



2.0 mL

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

Send on ice pack. Stable for 7 days at 4˚C

Reference Intervals

Female Reference Interval

Age Category
Reference Interval

Male Reference Interval

Age Category
Reference Interval
Additional Notes

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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.


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

Post dose is 2-hour post oral dose or 30 minutes post IV dose.

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