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Paediatric Laboratory Medicine

NK Cytotoxicity Activity (Cr 51 Release Activity)

Test Name

NK Cytotoxicity Activity (Cr 51 Release Activity)

Alternate Name/ Synonym

Natural Killer Cell Function


Haematopathology- Molecular Haematology


Chromium Release Assay

External Proficiency Testing

Intra-Laboratory Comparison

Turn Around Time

2-3 working days


Familial hemophagocytic lymphohistiocytosis (FHLH)

Specimen Type

Peripheral Blood (EDTA)

Minimum Specimen Requirements

2 mL

Optimal Collection Time

Fresh Specimen or refrigerated up to 24 hours


Peripheral Blood (EDTA) can be refrigerated for up to 24 hours and shipped on ICE PACKS.  

Special Requirements

Please call lab prior to shipping your samples.

Shipping and Contact Information

The Hospital for Sick Children
Rapid Response Laboratory
170 Elizabeth Street, Room 3642
Toronto, ON
M5G 2G3
Phone: 416-813-7200
Phone: 1-855-381-3212