Test Catalog

Test Id : UR

Bacterial Culture, Aerobic, Urine

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

Diagnosis of urinary tract infections


Quantitative culture results may be helpful in discriminating contamination, colonization, and infection

Reflex Tests
Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial tests.

Test Id Reporting Name Available Separately Always Performed
SIDC Ident Serologic Agglut Method 4 No, Bill Only No
PCRID Identification by PCR No, Bill Only No
COMM Identification Commercial Kit No, Bill Only No
RMALD Ident by MALDI-TOF mass spec No, Bill Only No
GID Bacteria Identification No, Bill Only No
ISAE Aerobe Ident by Sequencing No, Bill Only No
REFID Additional Identification Procedure No, Bill Only No
SALS Serologic Agglut Method 1 Ident No, Bill Only No
EC Serologic Agglut Method 2 Ident No, Bill Only No
SHIG Serologic Agglut Method 3 Ident No, Bill Only No
STAP Identification Staphylococcus No, Bill Only No
STRP Identification Streptococcus No, Bill Only No

Testing Algorithm
Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

When this test is ordered, the reflex tests may be performed and charged.

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

Conventional Quantitative Culture Technique/Identification of Pathogens Greater Than or Equal to 10,000 cfu/mL

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


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

Bacterial Culture, Aerobic, Urine

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

Aerobic Bacteria Culture, Urine

Culture, Aerobic Bacteria, Urine


Testing Algorithm
Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

When this test is ordered, the reflex tests may be performed and charged.

Specimen Type
Describes the specimen type validated for testing


Shipping Instructions

Specimen must arrive within 24 hours of collection.

Necessary Information

Specimen source is required.

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

Supplies: Urine tubes, 10 mL (T068)

Collection Container/Tube: Clean, plastic urine collection container

Submission Container/Tube: Plastic, 10-mL urine tube

Specimen Volume: 1 mL

Collection Instructions: Collect a random urine specimen.

Specimen Stability Information: Refrigerated 24 hours

Specimen Minimum Volume
Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

1 mL

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

All specimens will be evaluated by Mayo Clinic Laboratories for test suitability.

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
Urine Varies (preferred)

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

Diagnosis of urinary tract infections


Quantitative culture results may be helpful in discriminating contamination, colonization, and infection

Testing Algorithm
Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

When this test is ordered, the reflex tests may be performed and charged.

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

Urinary tract infection (UTI) encompasses a broad range of clinical entities that vary in their clinical presentation, degree of tissue invasion, epidemiologic setting, and antibiotic therapy requirements. There are 4 major types of UTIs: urethritis, cystitis, acute urethral syndrome, and pyelonephritis. UTIs may also be classified as uncomplicated or complicated. Escherichia coli is the leading cause of uncomplicated community-acquired UTI. Risk factors that predispose one to complicated UTIs include: underlying diseases that are associated with kidney infection (eg, diabetes), kidney stones, structural or functional urinary tract abnormalities, and indwelling urinary catheters. Another classification of UTIs is as upper UTI (related to the kidney, renal pelvis, or ureter) or lower UTI (urinary bladder and urethra). The classic symptoms of upper UTI are fever (often with chills) and flank pain; frequent painful urination, urgency, and dysuria are more often associated with lower UTI.

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.

No growth (Organism present <10,000 cfu/mL, or mixed flora.)

Identification of probable pathogens with colony count ranges

Provides information to assist in interpretation of the test results

In general, the isolation of more than 100,000 cfu/mL of a urinary pathogen is indicative of urinary tract infection (UTI). Isolation of 2 or more organisms above 10,000 cfu/mL may suggest specimen contamination. For specimens contaminated with the usual bacterial flora, bacteria that are potentially pathogenic are identified.

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

Although urine is normally sterile, contamination by organisms normally present in the urethra or on periurethral surfaces can allow a proliferation of these organisms yielding misleading urine culture results.


Urine held at ambient temperature for more than 30 minutes supports the growth of both pathogens and contaminants, leading to potentially inaccurate colony counts.


Urine obtained from catheter bags at the bedside and Foley catheter tips are unacceptable for culture.

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

1. Forbes BA, Sahm DF, Weissfeld AS: Infections of the urinary tract. In Bailey and Scott's Diagnostic Microbiology. 12th edition. St. Louis, MO, Mosby, 2007, pp 842-855

2. Procop GW, Church DL, Hall GS, et al: Koneman's Color Atlas and Textbook of Diagnostic Microbiology. Seventh edition. Philadelphia: Wolters Kluwer|Lippincott Williams and Wilkins; 2017. Chapter 2, Introduction to Microbiology Part II:  Guidelines for the Collection, Transport, Processing, Analysis, and Reporting of Cultures From Specific Specimen Sources; p. 66-110

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

The urine specimen is inoculated onto sheep blood agar and eosin methylene blue agar using a calibrated loop. Following 18 to 24 hours of incubation, semiquantitative colony counts are determined and potential urinary pathogens are identified using 1 or a combination of the following techniques: commercial identification strips or panels, matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, conventional biochemical tests, carbon source utilization, real-time polymerase chain reaction (RT-PCR), and nucleic acid sequencing of the 16S ribosomal RNA (rRNA) gene. Cultures with less than 10,000 cfu/mL of a single species are reported as "Organism present less than 10,000 cfu/mL." The presence of commensal flora of the urethra (contaminants) and mixed cultures of organisms present in colony counts less than 10,000 cfu/mL are reported as "mixed flora."(Chan WW: Urine cultures. In Clinical Microbiology Procedures Handbook. Vol 1. Fourth edition. Edited by AL Leber. Washington DC, ASM Press, 2016, Section 3.12)

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


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 Sunday

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.

2 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

1 day

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


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 Regional Manager. 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 has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

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.

87086-Bacterial Culture, Aerobic, Urine

87077-Identification Commercial Kit (if appropriate)

87077-Ident by MALDI-TOF mass spec (if appropriate)

87077-Bacteria Identification (if appropriate)

87153-Aerobe Ident by Sequencing (if appropriate)

87077-Additional Identification Procedure (if appropriate)

87147 x 1-3-Serologic Agglut Method 1 Ident (if appropriate)

87147-Serologic Agglut Method 2 Ident (if appropriate)

87147 x 4-Serologic Agglut Method 3 Ident (if appropriate)

87147 x 2-6 - Serologic Agglut Method 4 Ident (if appropriate)

87077-Identification Staphylococcus (if appropriate)

87077-Identification Streptococcus (if appropriate)

87185-Beta Lactamase (if appropriate)

87798-Identification by PCR (if appropriate)

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