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HelpTest Code Mg Magnesium
Patient Preparation
No special patient preparation required
Collection Method
Venous collection
Minimum Volume
- Adults: 0.8ml
- Pediatric: 0.5mL
Container
Lt Green / Plasma Separator / Lithium Heparin
Preferred Specimen
Light Green Top (lithium heparin) plasma
Acceptable Specimens
Serum:
- Gold Top SST
- Red Top
Plasma:
- Light Geen Top (lithium heparin)
Reference or Target Ranges
1.7 – 2.6 mg/dL
Reportable Units
mg/dL
Critical Value
<1.0 mg/dL or >4.9 mg/dL
Reasons for Rejection
| Hemolysis Threshold | 800 mg/dL |
| Icterus Threshold | 60 mg/dL |
| Lipemia Threshold | 2000 mg/dL |
| Other | QNS, contaminated, improperly Labeled, improper specimen type |
Specimen Stability
| Ambient | 7 days |
| Refrigerated (4°C to 8°C) | 7 days |
| Frozen(-40°C to 0°C) | 1 year |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time | Stat: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | UH Chemistry, WCH Chemistry |
| Methodology/Method Description | Roche Cobas – Colorimetric endpoint method |
CPT Codes
83735