Ordering Recommendation
Use to confirm diagnosis of hereditary spherocytosis when hemolytic anemia and spherocytes are present.
Mnemonic
Methodology
Qualitative Flow Cytometry
Performed
Sun-Sat
Reported
1-3 days
New York DOH Approval Status
Specimen Required
Lavender (EDTA) or green (sodium or lithium heparin). Include a Wright stained slide.
Transport 4 mL whole blood in the original container. (Min: 0.5 mL)
Refrigerated.
Clotted or hemolyzed specimens. Specimens older than 7 days.
Specimens must be analyzed within 7 days of collection.
Ambient: 3 days; Refrigerated: 7 days; Frozen: Unacceptable
Reference Interval
Normal
Interpretive Data
This test can be used to confirm a suspected diagnosis of Hereditary Spherocytosis (HS). HS is a common inherited hemolytic anemia characterized by the presence of spherical erythrocytes (spherocytes). HS is diagnosed based on family history and clinical features, along with clinical laboratory tests, including peripheral smear examination, osmotic fragility (OF), flow cytometry, or by genetic testing (Hereditary Hemolytic Anemia Panel Sequencing. ARUP test code 2012052).
Band 3 (or solute carrier family 4 member 1, SLC4A1) is the most abundant transmembrane protein found in human red blood cells (RBC). Eosin-5-maleimide (EMA) dye binds to band 3 on intact RBC's. A reduction of fluorescence intensity will be seen in hereditary spherocytosis. This test by flow cytometry has been reported to have a sensitivity of 93 percent for a diagnosis of HS. Congenital Dyserythropoietic Anemia Type II, Southeast Asian Ovalocytosis and Hereditary Pyropoikilocytosis are rare disorders that may also show a positive result.
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
Note
Hotline History
CPT Codes
88184
Components
Component Test Code* | Component Chart Name | LOINC |
---|---|---|
2008461 | RBC Band 3 Protein Reduction in HS | 33048-0 |
Aliases
- Hereditary Spherocytosis, EMA, BAND 3, Osmotic Fragility
- HS hemolytic anema assay