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BLOOD GAS, METHEMOGLOBIN
Test CodeLAB3008
Alias/See Also
Methemoglobin Study
CPT Codes
83045, 83050
Preferred Specimen
Arterial or venous blood in Heparinized syringe
Minimum Volume
0.5 mL
Other Acceptable Specimens
Arterial or venous blood in Heparinized green top Tube
Instructions
1. Contact RT prior to obtaining sample to verify orders in EPIC of a methb sample. 2. Do not shake the sample. 3. Place sample on ice if analysis is not done immediately. 4. Interfering factors include nitroglycerin, nitrites, phenacetin, chlorates, lidocaine, radiation, nitrite toxicity in breast-fed infants.
Transport Container
Sample does not require being placed on ice unless actual assay time of sample is greater 20 minutes.
Transport Temperature
Sample does not require being placed on ice unless actual assay time of sample is greater than 20 minutes. Air bubbles must be expelled from sample syringe
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Specimen must have patient label attached to sample/syringe
Setup Schedule
Set Up:Daily Report Available:<30 minutes
Reference Range
| MetHb | % | 0.0-1.0 |
Clinical Significance
Assay is performed to detect acquired methemoglobinemia, usually caused by excessive radiation or the toxic effects of chemicals or drugs. It is also used to detect congenital methemoglobinemia and carbon monoxide poisoning. Increased MetHb levels may indicate methemoglobinemia or carbon monoxide poisoning or use of certain drugs. Decreased MetHb levels may occur in pancreatitis
Performing Laboratory
GBMC Respiratory Therapy
