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Lab Dept:
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Serology
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Test Name:
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CTL FUNCTION
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General Information
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Lab Order Codes:
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CTLY
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Synonyms:
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Cytotoxic T Lymphocyte Function
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CPT Codes:
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86849 – Unlisted immunology procedure
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Test Includes:
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Interpretive report on CTL Function
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Logistics
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Test Indications:
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Aid in confirming recurrent viral infection and severe immune deficiency.
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Lab Testing Sections:
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Serology – Sendouts
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Referred to:
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Cincinnati Children’s Hospital Medical Center
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Restricted Draw Times: To avoid specimen rejection due to limited specimen stability of CTL function testing, collect sample in the afternoon Sunday – Thursday.
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Turnaround Time:
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10 days, test set up Monday – Friday.
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Special Instructions:
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Obtain special Green top (Na Heparin) tube from the laboratory prior to collection. Specimen must be processed at the reference laboratory within 24 hours of collection.
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Green top (Na Heparin) tube
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Draw Volume:
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10.0 mL (Minimum: 5.0 mL) blood
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Processed Volume:
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Same as Draw Volume
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Collection:
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Routine venipuncture
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Special Processing:
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Lab Staff: Do Not centrifuge, maintain specimen at room temperature in original collection container. Ship by overnight courier to arrive within 24 hours of draw time. Do Not refrigerate or freeze. Forward promptly.
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Patient Preparation:
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None
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Sample Rejection:
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Specimen older than 24 hours, frozen or refrigerated specimen, specimen collected in the wrong tube, mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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≥6.2 LU, Interpretive report
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Critical Values:
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N/A
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Limitations:
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N/A
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Methodology:
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Chromium Release Assay
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Contraindications:
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N/A
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References:
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Cincinnati Children’s Hospital Medical Web Page www.cincinnatichildrens.org August 2007
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