Ordering RecommendationRecommendations when to order or not order the test. May include related or preferred tests.
MnemonicUnique test identifier.
STR
MethodologyProcess(es) used to perform the test.
Quantitative Immunoturbidimetry
PerformedDays of the week the test is performed.
Sun-Sat
ReportedExpected turnaround time for a result, beginning when ARUP has received the specimen.
Within 24 hours
New York DOH Approval StatusIndicates test has been approved by the New York State Department of Health.
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 IntervalNormal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Male- 18 years & older:2.2-5.0 mg/L Female - 18 years & older: 1.9-4.4 mg/L
Interpretive DataBackground information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
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
Compliance Category
FDA
NoteAdditional information related to the test.
Hotline History
N/A
CPT CodesThe American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
AliasesOther names that describe the test. Synonyms.
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