Test Overview
Test Methodology

Immunoturbidimetric assay

Test Usage

The 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. It is also used in the evaluation of insulin-dependent diabetics for iron-deficiency resulting from gastric autoimmunity and atrophic gastritis.

Reference Range *

1.8 - 4.6 mg/L

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

The SOTFR immunoassay should not be used for routine clinical evaluation of patients for iron status when ferritin immunoassay would be appropriate, such as in the absence of confounding pathologies (inflammation, chronic disease, or malignancy). Patients with hemodialysis and recent blood loss may have falsely elevated SOTFR levels. SOTFR is elevated in patients with thalassemia and sickle cell disease. Caution should be exercised in managing anemia in these individuals based on the SOTFR test results

Test Details
Days Set Up
Monday, Wednesday, Friday
Analytic Time

2 hours

Soft Order Code
MiChart Code
Chemical Pathology
Specimen Requirements
Collection Instructions

Collect specimen in an SST or Red top tube and centrifuge within 2 hours. Red top tubes - aliquot serum into a plastic vial.

Store frozen if delivery will be delayed, otherwise stable for 7 days refrigerated.

Normal Volume
1 mL serum
Minimum Volume
0.25 mL serum
CPT Code
Fee Code