Intrinsic Factor Blocking Antibody
Test Mnemonic
INTFCT
CPT Codes
- 86340 - QTY (1)
LOINC ®
31444-3
Performing Laboratory
Cleveland Clinic Laboratories
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Serum | SST (Gold) | Refrigerated |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Serum | Red Plain | Refrigerated |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 24 hours |
| Refrigerated | 7 days |
| Frozen | 30 days |
Days Performed
Mon, Wed, Fri
Turnaround Time
2 - 4 days
Methodology
| Name | Description |
|---|---|
| Immunoenzymatic Assay |
Reference Range
| Intrinsic Factor Blocking Antibody Quantitative | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Normal | <1.20 | AU/mL |
Clinical Info
The test is used as an aid in diagnosing pernicious anemia. It is recommended to correlate with anti-parietal IgG antibody test result where autoimmune gastritis is clinically suspected.
Clinical Limitation
High serum levels of free vitamin B12 may give false positive results for intrinsic factor antibody. No sample should be collected from a patient who has received vitamin B12 injection therapy within the past week.