Within 24 hours
Serum separator tube or plasma separator tube. Also acceptable: green (sodium or lithium heparin), lavender (EDTA), or pink (K2EDTA).
Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.3 mL)
Contaminated, severely hemolyzed, icteric, or lipemic specimens.
After separation from cells: Ambient: 72 hours; Refrigerated: 1 week; Frozen: 1 month (avoid repeated freeze/thaw cycles)
Male - 18 years & older: 2.2-5.0 mg/L
Female - 18 years & older: 1.9-4.4 mg/L
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|
|Component Test Code*||Component Chart Name||LOINC|
|0070283||Soluble Transferrin Receptor||30248-9|
- Transferrin Receptor
- Transferrin Receptor Level