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HelpTest Code B12 Vitamin B12, Serum
Additional Codes
LAB67
Patient Preparation
Fasting recommended
Special Collection Instructions
Samples should not be taken from patients receiving therapy with high biotin doses (i.e. >5 mg/day) until at least 8 hours following the last biotin administration.
Collection Method
Venous collection
Minimum Volume
0.5ml
Container
Serum (SST or red top tube)
Acceptable Specimens
Serum:
- Gold Top SST
- Red Top
Plasma:
- Light Geen Top (lithium heparin)
Reference or Target Ranges
| Age | Male | Female |
| All ages | 211-946 | 211-946 |
Reportable Units
pg/mL
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 400 mg/dL |
| Icterus Threshold | 65 mg/dL |
| Lipemia Threshold | 1500 mg/dL |
| Other | QNS, contaminated, improperly Labeled, improper specimen type |
Specimen Stability
| Ambient | Not listed, refrigerate ASAP |
| Refrigerated (4°C to 8°C) | Serum SST: 24 hours All other tubes: 48 hours |
| Frozen(-40°C to 0°C) | 2 weeks |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Stat: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
82607
Last review/edit date
2025