Methemoglobin
| Abbrev Code: | MHGB | ||
| Order Code: | LAB4187 | Order Name: | Methemoglobin |
| Methodology: | Spectrophotometric analysis of hemolysate | ||
| CPT Codes: | 83050 x1 | ||
| Turnaround Time: | Performed and reported 24 hours/day. | ||
| Special Instructions: | Sample is pH dependent. Methemoglobin may revert to hemoglobin on standing. Ideally, test is performed within 2 hours of collection; up to 10% decrease may occur after 4 hours, up to a 16% decrease after 8 hours. | ||
Collection Instructions
| Specimen: | Blood (arterial, venous, capillary) |
| Optimal Volume: | 1 mL |
| Minimum\Peds Volume: | 0.5 mL (3 mL syringe); 0.2 mL (tuberculin syringe); 0.1 mL (capillary tube) |
| Container: | St Johns/Woodwinds - Dry heparin syringe, Dry heparin syringe Alternate Containers: Capillary (lithium heparin) gas tube, Green (lithium heparin, no gel), Green (lithium heparin, no gel) on ICE, Green (sodium heparin, no gel), Green (sodium heparin, no gel) on ICE |
| Collection Instructions: | Sample should be free of air bubbles. If collecting in green (heparin) tube, do not remove stopper. Deliver to the laboratory immediately; if received within 20 minutes, ice is not required. |
| Causes for Rejection: | Gross lipemia; presence of >1% sulfhemoglobin, >60 mg/L methylene blue or citrate. |
Processing and Shipping
| Specimen Processing: | Do not store. |
| Shipping Instructions: | Ship on wet ice to arrive within 8 hours, preferably 2 hours. |
| Test Performed at or Referral Lab | Chemistry (CSC Mpls, Grand Itasca, Northland, Range, Ridges, Southdale, St. John's, UMMC East Bank, UMMC West NICU, UMMC/UMMCH-West Bank, Woodwinds) |
Interpretive
| Critical Range: | Whole Blood Testing Critical Values and Reference Ranges |
| Reference Range: | Whole Blood Testing Critical Values and Reference Ranges Smokers may be slightly higher than non-smokers. |
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