| Test Name: |
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Methemoglobin
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| Test Code(s): |
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MHGB / XMHGB
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| CPT Code(s): |
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83050
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| Methodology: |
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Spectrophotometry
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| Days Performed: |
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Daily, 24 hours.
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| Turnaround Time: |
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Stat: 1 hour. All requests processed stat.
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Specimen Requirements
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| Specimen: |
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Arterial, venous, or capillary
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| Collection Instructions: |
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Specimen must be free of air bubbles and clots.
For capillary specimens, collect two full Radiometer capillaries.
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| Collection Container: |
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Preferred: Radiometer PICOŽ syringe
Also Acceptable:
2 full Radiometer capillary tubes
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| Collection Volume: |
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Preferred: 1.5 mL
Pediatrics: 0.5 mL
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| Sample Analyzed: |
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Whole Blood
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| Volume Required: |
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Preferred: 1.5 mL
Pediatrics: 0.5 mL
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| Specimen Transport: |
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Transport specimen to UWHC Core Laboratory (B4/220)immediately. Specimen must arrive in the UWHC Core Lab within 30 minutes of collection.
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| Unacceptable Criteria: |
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Clotted specimens, specimens with air in the syringe, or specimens past stability time are not acceptable.
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| Stability: |
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Ambient: 30 minutes
Refrigerated: 1 hour
Frozen: Not acceptable
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Interpretation
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Expected Results:
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Up to 1.5% of total hemoglobin
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| Test Limitations: |
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Interferences due to lipemia or sulfhemoglobinemia are rare but may occur.
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| Critical Calls: |
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View
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| Additional Information: |
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Cyanosis is evident when level reaches 10 - 15% of total hemoglobin.
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