Test Details
Mnemonic
OSFR
Ordering Code
3802425
CPT-4 Code(s)
85557
Specimen Information
Collect
Lavender EDTA
Specimen Preparation
Collect EDTA from patient and control from a nonrelated, nonsmoking person. Send 4.0 mL whole blood in original collection tubes. Tubes must arrive refrigerated within 72 hours of collection. Label control tube clearly on outermost label "normal control". Collect sample Sunday - Thursday only.
Minimum Volume
2.0 mL
Transport Temperature
Refrigerated
Rejection Criteria
Frozen specimens, clotted specimens, gross hemolysis
Stability
Room temperature: Unacceptable
Refrigerated: 72 hours
Frozen: Unacceptable
Refrigerated: 72 hours
Frozen: Unacceptable
Methodology
Osmotic Lysis
Reference Range
≥12 months:
0.50 g/dL NaCl (unincubated): 3 - 53% hemolysis
0.60 g/dL NaCl (incubated): 14 - 74% hemolysis
0.65 g/dL NaCl (incubated): 4 - 40% hemolysis
0.75 g/dL NaCl (incubated): 1 - 11% hemolysis
Reference values have not been established for patients who are <12 months of age.
0.50 g/dL NaCl (unincubated): 3 - 53% hemolysis
0.60 g/dL NaCl (incubated): 14 - 74% hemolysis
0.65 g/dL NaCl (incubated): 4 - 40% hemolysis
0.75 g/dL NaCl (incubated): 1 - 11% hemolysis
Reference values have not been established for patients who are <12 months of age.
Performing Laboratory
Mayo Clinic Laboratories
New York DOH Approval Status
Yes