Soluble Transferrin Receptor
0070283
 
Ordering Recommendation
Mnemonic
STR
Methodology
Quantitative Immunoturbidimetry
Performed
Sun-Sat
Reported
Within 24 hours
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
 
Collect
Serum separator tube or plasma separator tube. Also acceptable: green (sodium or lithium heparin), lavender (EDTA), or pink (K2EDTA).  
Specimen Preparation
Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.3 mL)  
Storage/Transport Temperature
Refrigerated.  
Unacceptable Conditions
Contaminated, severely hemolyzed, icteric, or lipemic specimens.  
Remarks
 
Stability
After separation from cells: Ambient: 72 hours; Refrigerated: 1 week; Frozen: 1 month (avoid repeated freeze/thaw cycles)  
Reference Interval
Male - 18 years & older: 2.2-5.0 mg/L
Female - 18 years & older: 1.9-4.4 mg/L
Interpretive Data
People of African descent and those residing at 5,200 feet (1,600 meters) above sea level were found to have a 6% higher normal value. These differences were additive. Reference intervals have not been established for pregnant females, patients under 18 years of age, and recent or frequent blood donors.

Serum soluble transferrin receptor increases in iron deficiency and is usually unaffected by chronic disease states. In general, to increase sensitivity and specificity, the measurement of serum soluble transferrin receptor should be performed in combination with other tests of iron status, including ferritin, TIBC, and serum iron (refer to table below).
Tests for Changes in: Iron Deficiency Anemia Anemia of Chronic Disease Iron Deficiency & Anemia of Chronic Disease
Ferritin Iron Stores Low High Normal or High
TIBC Iron Status High Low Normal or High
Serum Iron Iron Status Low Low Low
sTfR Iron Status High Normal High
Note
CPT Code(s)
84238
Components
Component Test Code*Component Chart Name
0070283Soluble Transferrin Receptor
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, contact interface support at interface.support@aruplab.com.
Cross References
  • sTfR
  • TfR
  • Transferrin Receptor
  • Transferrin Receptor Level