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HelpTest Code STFR Soluble Transferrin Receptor (sTfR), Serum
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.
CMH COLLECTION: 1mL blood in a vacutainer Preferred: Red gel Acceptable: Red
Specimen Minimum Volume
0.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Frozen (preferred) | 90 days | |
| Refrigerated | 7 days | ||
| Ambient | 72 hours |
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)
Reject Due To
| Gross hemolysis | Reject |
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 to 2 daysReporting Name
Soluble Transferrin Receptor (sTfR)Reference Values
1.8-4.6 mg/L
It is reported that African Americans may have slightly higher values.
Method Name
Immunoturbidimetric Assay
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84238