Methemoglobin
Ordering Info & Methodology
Test Code
Cerner Synonyms
FMHB
MetHb, Methemoglobin
Turn Around Time
Methodology
Analyzed within 1 hour of receipt, 24/7.
Co-oximetry, Radiometer ABL
Ordering Guide
Component of RMP and ABG
Specimen Requirements
Sample Type
Collection Container
Alternate Collection Containers
Whole Blood
Heparinized Syringe
1 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
Reference Intervals
Female Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
≥ 0 y | <0.015 | |
Male Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
≥ 0 y | <0.015 | |
Additional Notes
[object Object]
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.
3%
Measurement Uncertainty
Methemoglobin, if present, will be reported on any blood gas order. If the methemoglobin is not detectable, it does not report.
Hydroxycobalamin, given to smoke exposure victims, results in marked positive bias in methemoglobin.