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HelpTest Code STFR Soluble Transferrin Receptor (sTfR), Serum
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
Soluble Transferrin Receptor (sTfR)Useful For
Evaluation of suspected iron deficiency in patients who may have inflammation, infection, or chronic disease and other conditions in which ferritin concentration does not correlate with iron status, including:
-Cystic fibrosis patients who frequently have inflammation or infections(2-3)
-Evaluating insulin-dependent diabetics who may have iron-deficiency resulting from gastric autoimmunity and atrophic gastritis(4)
Specimen Required
Supplies: Sarstedt Aliquot Tube 5 mL (T914)
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions:
1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial within 2 hours of collection.
Specimen Minimum Volume
0.25 mL
Specimen Type
SerumSpecimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Frozen (preferred) | 90 days | |
| Refrigerated | 7 days | ||
| Ambient | 72 hours |
Day(s) Performed
Monday through Sunday
Reference Values
1.8-4.6 mg/L
It is reported that African Americans may have slightly higher values.
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.Method Name
Immunoturbidimetric Assay
CPT Code Information
84238
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| STFR | Soluble Transferrin Receptor (sTfR) | 30248-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| STFR | Soluble Transferrin Receptor (sTfR) | 30248-9 |