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Labcorp Oklahoma, Inc.
Test Directory


RBC Osmotic Fragility

Test Number: 0104740
Revision Date 12/12/2022
Test Name Methodology LOINC Code
RBC Osmotic Fragility
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 5mL + 2 Smears (1mL + 2 Smears) Whole Blood Sodium Heparin (Green Top / No-Gel) Refrigerated
Alternate 1 5mL + 2 Smears (1mL + 2 Smears) Whole Blood EDTA (Lavender Top) Refrigerated
Alternate 2 5mL (1mL + Smears) Whole Blood Lithium Heparin (Dark Green Top / No-Gel) Refrigerated
Instructions Notes: 1 mL (Note: This volume Does NOT allow for repeat testing).
Specimen Type: Green-top (heparin) tube OR lavender-top (EDTA) tube AND (2) unfixed smears
Specimen Storage: Refrigerate Stability: Room temperature: unacceptable Refrigerate: 72 hours Frozen: unacceptable
Specimen Collection: Draw specimen Mon-Wed ONLY. Refrigerate specimens within 30 minutes of collection. Specimens must be received and testing performed by ARUP within 72 hours of collection.
Special Instructions: Testing referred to ARUP Y8#2002257 NOTE: Draw specimen Mon-Wed ONLY. Please contact regional referral department to arrange transportation of time sensitive specimen
Specimen Stability: Ambient: Not Available, Refrigerated : Not Available, Frozen: Not Available
Expected TAT 5 - 8 days  
Clinical Use To confirm suspected red cell spherocytosis. 
Performing Labcorp Test Code 284205 
Notes Labcorp Test Code: 284205
CPT Code(s) 85555; 80500
Lab Section Reference Lab