Soluble Transferrin Receptor
sTfR, MAYO: STFR, EPIC: LAB6152, SOFT: XSTR
Specimen Collection Criteria
Collect (preferred specimen): One Gold-top SST tube.
Also acceptable: One plain Red-top tube.
Physician Office/Drawsite Specimen Preparation
Let specimen clot completely then centrifuge to separate serum from cells within two hours of collection. Transfer serum to a plastic transport tube and freeze (-20°C/-4°F or below).
Preparation for Courier Transport
Transport: 1.0 mL serum, frozen (-20°C/-4°F or below). (Min: 0.25 mL)
- Grossly hemolyzed specimens.
- Specimens not collected and processed as indicated.
Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): 72 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 90 days
Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.
Sent to Mayo Medical Laboratory Rochester, MN.
Saturday - Sunday.
Results available in 2-4 days.
It is reported that African Americans may have slightly higher values.
The concentration of Soluble Transferrin Receptor (sTfR) is an indicator of iron status. Iron deficiency causes overexpression of transferrin receptor and sTfR levels, while iron repletion results in decreased sTfR levels. sTfR levels should be used to evaluate 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.
MAYO: STFR, EPIC: LAB6152, SOFT: XSTR
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This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills,
Grosse Pointe, Royal Oak, and Troy campuses.