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Lab Dept:
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Anatomic Pathology
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Test Name:
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LACTASE ON GI BIOPSIES
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General Information
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Lab Order Codes:
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LTAS
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Synonyms:
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N/A
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CPT Codes:
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82657 – Enzyme activity in blood cells, cultured cells, or tissue, not elsewhere specified; nonradioactive substrate, each specimen
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Test Includes:
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Lactase level only reported in uM/min/gram protein.
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Logistics
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Test Indications:
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N/A
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Lab Testing Section:
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Anatomic Pathology - Sendouts
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Referred to:
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Mayo Medical Laboratories, Test # 91305 (forward to Joli Diagnostics, Inc., Joli test name: “Disaccharidase Determination (for Lactase only)”.
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6711
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651-220-6560
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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1 week
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Small Bowel biopsy
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Container:
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Small, tightly capped, plastic tube
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Draw Volume:
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5 mg small bowel biopsy specimen
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Processed Volume:
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Same Draw Volume
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Collection:
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Collect fresh tissue. Do not place tissue on gauze or filter paper, nor should any saline, support or embedding material be added.
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Special Processing:
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Lab Staff: Sample should be kept frozen and stored at –20 C to –70 C. Ship frozen. Forward promptly.
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Patient Preparation:
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Physician preference
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Sample Rejection:
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Thawed specimen
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Interpretive
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Reference Range:
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Lactase:
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24.5 +/- 8.0 uM/min/gram protein; Abnormal <15.0
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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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Nucleic Acid Amplification Technology
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References:
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Mayo Medical Laboratories December 2009
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Update:
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2/15/2011: CPT update, previously listed as 89130.
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