Beta 2 Transferrin
Ordering Info & Methodology
Test Code
Cerner Synonyms
B2TB
CSF Leak Investigation, CSF Leak Investigation (Beta Trace Protein, Beta 2 Transferrin), CSF Screen, beta 2 transferrin, CSF leak
Turn Around Time
Methodology
Same day when arrives Mon-Fri before 15:00
Calculated Value
Ordering Guide
Beta 2 Transferrin will be added if indicated by the beta trace results.
Specimen Requirements
Sample Type
Collection Container
Alternate Collection Containers
CSF, Serum (send both)
Cannot be added on to previously collected sample.
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
Freeze. Send on ice pack. Must arrive at SPH frozen. Must arrive before 15:00 Mon - Fri to be processed STAT.
Reference Intervals
Female Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
≥0 y | <4.9 | |
Male Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
≥0 y | <4.9 | |
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.
16%
Measurement Uncertainty