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Test ID BLOD1175 Soluble Transferrin Receptor (sTfR), Serum

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(1-2)

-Evaluating insulin-dependent diabetics who may have iron-deficiency resulting from gastric autoimmunity and  atrophic gastritis(3)

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

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 aliquoted within 2 hours of collection.

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 90 days
  Refrigerated  7 days
  Ambient  72 hours

Reference Values

1.8-4.6 mg/L

It is reported that African Americans may have slightly higher values.

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Test Classification

This test has been cleared or approved by the U.S. 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.

CPT Code Information


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

Analytic Time

Same day/1 day

Reject Due To


Mild OK; Gross reject








Method Name

Immunoturbidimetric Assay