Test Catalog

Test Id : DSAC

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Disaccharidase Activity Panel, Tissue

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Overview

Test Catalog

Useful For
Suggests clinical disorders or settings where the test may be helpful

Evaluation of patients who present with signs or symptoms suggestive of disaccharidase disorders

This test is not intended for carrier detection.

Genetics Test Information
Provides information that may help with selection of the correct genetic test or proper submission of the test request

Diagnostic testing for patients with clinical signs and symptoms suspicious of a disaccharidase deficiency.

Method Name
A short description of the method used to perform the test

Spectrophotometry

NY State Available
Indicates the status of NY State approval and if the test is orderable for NY State clients.

Yes

Reporting Name
Lists a shorter or abbreviated version of the Published Name for a test

Disaccharidase Activity Panel, Ts

Aliases
Lists additional common names for a test, as an aid in searching

Disaccharidase Determination

Specimen Type
Describes the specimen type validated for testing

Tissue

Shipping Instructions

Freeze immediately after collection and ship frozen.

Specimen Required
Defines the optimal specimen required to perform the test and the preferred volume to complete testing

Specimen Type: Tissue

Source: Intestinal biopsy

Container/Tube: Clean, screw-topped plastic vial

Specimen Volume: 5 mg

Collection Instructions: Specimen should not be placed on gauze or filter paper, nor should any saline, support or embedding material be added.

Forms

Specimen Minimum Volume
Defines the amount of sample necessary to provide a clinically relevant result as determined by the testing laboratory. The minimum volume is sufficient for one attempt at testing.

See Specimen Required

Reject Due To
Identifies specimen types and conditions that may cause the specimen to be rejected

Specimens sent in formaldehyde, saline, or any supportive media
Gauze
Filter paper
Foil
Swabs 		Reject

Specimen Stability Information
Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen Type Temperature Time Special Container
Tissue Frozen 28 days OTHER

Useful For
Suggests clinical disorders or settings where the test may be helpful

Evaluation of patients who present with signs or symptoms suggestive of disaccharidase disorders

This test is not intended for carrier detection.

Genetics Test Information
Provides information that may help with selection of the correct genetic test or proper submission of the test request

Diagnostic testing for patients with clinical signs and symptoms suspicious of a disaccharidase deficiency.

Clinical Information
Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

Disaccharidases in the small intestines are responsible for the breakdown of disaccharides (double sugars) into monosaccharides (simple sugars). Patients with a deficiency of 1 or more disaccharidase enzymes can experience intolerance to foods containing complex sugars resulting in a range of gastrointestinal symptoms including diarrhea or constipation, abdominal pain and cramping, gas, bloating, and nausea. In addition, patients may experience malnutrition, weight loss, or failure to thrive. Given the nonspecificity and frequency of abdominal symptoms, misdiagnosis or a diagnostic delay of disaccharide deficiencies may occur.

 

Primary and secondary causes of disaccharidase deficiencies exist, and age of onset may vary from birth through adulthood. Primary causes are rare and result from genetic alterations in a variety of genes. Secondary deficiencies typically result from small intestinal mucosal damage. Treatment of both primary and secondary disaccharidase deficiencies involves dietary management. While primary deficiencies require lifelong treatment, secondary disaccharidase deficiencies may require treatment only until the intestinal lining recovers.

Reference Values
Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

Lactase: > or =14.0 nmol/min/mg protein

Sucrase: > or =19.0 nmol/min/mg protein

Maltase: > or =70.0 nmol/min/mg protein

Palatinase: > or =6.0 nmol/min/mg protein

Glucoamylase: > or =8.0 nmol/min/mg protein

Interpretation
Provides information to assist in interpretation of the test results

Quantitative values of lactase, sucrase, maltase, palatinase, and glucoamylase are reported. Clinical interpretation of results is provided.

Cautions
Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

This test will not distinguish between primary and secondary causes of disaccharidase deficiencies.

Clinical Reference
Recommendations for in-depth reading of a clinical nature

1. Cohen SA, Oloyede H, Gold BD, Mohammed A, Elser HE: Clinical characteristics of disaccharidase deficiencies among children undergoing upper endoscopy. J Pediatr Gastroenterol Nutr. 2018 Jun;66 Suppl 3:S56-S60

2. Semenza G, Auricchio S, Mantei N. : Small-intestinal disaccharidases. In: Valle DL, Antonarakis S, Ballabio A, Beaudet AL, Mitchell GA. eds. The Online Metabolic and Molecular Bases of Inherited Disease. McGraw Hill; 2019. Accessed August 23, 2021. Available at https://ommbid.mhmedical.com/content.aspx?bookid=2709&sectionid=225081608

Method Description
Describes how the test is performed and provides a method-specific reference

Disaccharidase activities are measured by incubating intestinal homogenates with an appropriate disaccharide substrate, which releases glucose. Glucose production is determined by a glucose oxidase reagent mixture that oxidizes glucose to produce peroxide, which reacts with phenol aminophenazone to form a red quinoneimine dye. The concentration of quinoneimine is determined spectrophotometrically and the concentration of liberated glucose is calculated from a glucose standard curve. The amount of glucose produced is proportional to the disaccharidase activity in the intestinal homogenate. Disaccharidase activities are expressed as nanomoles of glucose per minute per milligram of protein (nmol/min/mg prot).(Unpublished Mayo method)

PDF Report
Indicates whether the report includes an additional document with charts, images or other enriched information

No

Day(s) Performed
Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.

Monday through Friday

Report Available
The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.

3 to 5 days

Specimen Retention Time
Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

Biopsy homogenate: 1 month

Performing Laboratory Location
Indicates the location of the laboratory that performs the test

Rochester

Fees
Several factors determine the fee charged to perform a test. Contact your U.S. or International Regional Manager for information about establishing a fee schedule or to learn more about resources to optimize test selection.

  • Authorized users can sign in to Test Prices for detailed fee information.
  • Clients without access to Test Prices can contact Customer Service 24 hours a day, seven days a week.
  • Prospective clients should contact their account representative. For assistance, contact Customer Service.

Test Classification
Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR) product.

This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information
Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Clinic Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.

CPT codes are provided by the performing laboratory.

82657

LOINC® Information
Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the order and results codes of this test. LOINC values are provided by the performing laboratory.

Test Id Test Order Name Order LOINC Value
DSAC Disaccharidase Activity Panel, Ts 57765-0
Result Id Test Result Name Result LOINC Value
Applies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
608237 Lactase 81315-4
608238 Sucrase 30372-7
608239 Maltase 30315-6
608240 Palatinase 81314-7
608241 Glucoamylase 81322-0
608242 Interpretation 57779-1
608243 Reviewed By 18771-6

Test Setup Resources

Setup Files
Test setup information contains test file definition details to support order and result interfacing between Mayo Clinic Laboratories and your Laboratory Information System.

Excel | Pdf

Sample Reports
Normal and Abnormal sample reports are provided as references for report appearance.

Normal Reports | Abnormal Reports

SI Sample Reports
International System (SI) of Unit reports are provided for a limited number of tests. These reports are intended for international account use and are only available through MayoLINK accounts that have been defined to receive them.

SI Normal Reports | SI Abnormal Reports