Texas Department of State Health Services - Microbiology Lab Tests

Microbiology
Rabies (Microscopic – Direct Fluorescent Antibody)
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Test Includes:
Reporting
Results Available:	Contact #s: 512-458-7595
Reference
Method: Direct Fluorescent Antibody test
Turnaround Time: 24-72 hours	Reference Range: Negative by direct FA for rabies
Limitations:	Interpretation:
Specimen Requirements
Specimen Collection: Avoid damage to the brain: do not traumatize the head. Separate the animal head from the body immediately after death.	Sample Type:
Volume/Amount Required: Complete transverse section of brain stem and portions of the cerebellum or hippocampus.	Preferred Specimen: Animal Head
Collection/Preservation:	Storage Instructions: 2-8°C (do not freeze)
Causes for Rejection:	Sample Container: See Rabies Specimen Shipping and Packing Instructions
Sample Test Kit:	Availability:
Diagnostic Information: Whole animal carcasses are not accepted, except for bats and similar very small mammals.
Specimen Submission
Required Request Form: G-9	Specimen Handling:
Transport Temperature: 2-8°C (refrigerated), overnight	Shipping Requirements: Notify the laboratory of the shipment by calling 1-800-252-8163.
Billing
CPT Code:	Fees:

Microbiology
Red Tide Analysis See also Brevitoxin (Culture – Toxin Detection)
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Test Includes: Small animal inoculation
Reporting
Results Available: 1 day	Contact #s: (512) 458-7562
Reference
Method: Small animal inoculation
Turnaround Time: 1 day	Reference Range: No toxin detected
Limitations: For shellfish testing only	Interpretation: By report
Specimen Requirements
Specimen Collection: Oyster harvest	Sample Type: Oysters
Volume/Amount Required: 10-12 oysters	Preferred Specimen: Oysters
Collection/Preservation: Harvest 10-12 oysters from the affected area.	Storage Instructions: 2-8° C
Causes for Rejection: Specimen not collected	Sample Container: Leak-proof container
Sample Test Kit:	Availability: Monday-Sunday with prior notification
Diagnostic Information: See Brevitoxin (Culture – Toxin Detection)
Specimen Submission
Required Request Form: Seafood safety	Specimen Handling: Oysters may need to be shucked. Wear protective gloves.
Transport Temperature: 2-8° C	Shipping Requirements: Overnight, cold paks.
Billing
CPT Code:	Fees:

Microbiology
Relapsing Fever (Serological – Forwarded by TDSHS to CDC for testing.)
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Test Includes:
Reporting
Results Available:	Contact #s:
Reference
Method:
Turnaround Time: 3 weeks	Reference Range: <1.00 (Nonreactive)
Limitations: May not detect a recent infection, or infection in a person with a severely compromised immune system.	Interpretation: Nonreactive indicates that the patient does not have detectable antibody to the infectious agent. Reactive indicates that the patient has detectable antibody to the infectious agent, and depending on the clinical picture, may have a current or past infection.
Specimen Requirements
Specimen Collection: Venipuncture	Sample Type: Serum
Volume/Amount Required: 10 mL whole blood	Preferred Specimen: Single Serum; Paired Sera
Collection/Preservation: Red top or tiger top tube	Storage Instructions: Do not freeze or refrigerate whole blood. Separated serum may be held at 2-8°C
Causes for Rejection: Discrepancy between name on tube and name on form, insufficient quantity of serum for testing	Sample Container: Red top or tiger top tube
Sample Test Kit:	Availability:
Diagnostic Information: The test procedure is used for investigational use and clinical history of the patient is required. Sera are forwarded to the CDC with prior approval (512) 458-7760.
Specimen Submission
Required Request Form: G-2A	Specimen Handling: Use Universal Precautions
Transport Temperature: Ambient temperature for specimens on the blood clot, separated serum at 2-8°C (refrigerated) or -20°C (frozen).	Shipping Requirements: Triple contain, separated serum may be shipped on cold packs (2-8°C), or frozen (-20°C) and mailed on dry ice.
Billing
CPT Code: 86619	Fees:

Microbiology
Respiratory Syncytial Virus (Culture – Isolation)
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Test Includes: Cell culture
Reporting
Results Available: 2-14 days	Contact #s: 512-458-7594
Reference
Method: Cell Culture
Turnaround Time: 2-14 days	Reference Range: No virus isolated
Limitations:	Interpretation: A result of “No virus isolated” does not necessarily mean absence of a viral agent. The success of virus isolation depends a great deal on the submission of the proper specimen, collected at the right time, adequately maintained, and shipped with the least possible delay.
Specimen Requirements
Specimen Collection:Specimens should be collected at an appropriate anatomic site and at the proper time after infection because viruses are generally shed for only a short period of time. Refer to Specimen Collection by Type table for additional instructions.	Sample Type: See preferred specimen
Volume/Amount Required: Swabs in 2-4 mLs of viral transport media.	Preferred Specimen: Throat swab, NP swab, NP secretions
Collection/Preservation: Viral transport media.	Storage Instructions: Maintain specimens at 2-8°C immediately after collection. Ship with the least possible delay.
Causes for Rejection: Specimens submitted on a preservative such as formalin.	Sample Container: Sterile container
Sample Test Kit:	Availability: Monday - Friday
Diagnostic Information: Specimens are inoculated onto a variety of cell culture monolayers. If characteristic CPE is observed, confirmation of identification will be performed.
Specimen Submission
Required Request Form: G-2V	Specimen Handling:
Transport Temperature: 2-8°C, overnight	Shipping Requirements: Ship specimens in compliance with governmental regulations.
Billing
CPT Code: 87252	Fees:

Microbiology
Respiratory Syncytial Virus (Culture – Identification)
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Test Includes: Immunofluoresence
Reporting
Results Available: 2-14 days	Contact #s: 512-458-7594
Reference
Method: Immunofluorescence
Turnaround Time: 2-14 days	Reference Range: By report
Limitations:	Interpretation:
Specimen Requirements
Specimen Collection:	Sample Type:
Volume/Amount Required: If transporting on dry ice, send 1-2 mLs.	Preferred Specimen: Cell culture isolate with CPE.
Collection/Preservation:	Storage Instructions: Store at -70° C.
Causes for Rejection:	Sample Container: Sterile cryovial.
Sample Test Kit:	Availability: Monday - Friday
Diagnostic Information: Identification based on immunofluorescence test using RSV-specific monoclonal antibody.
Specimen Submission
Required Request Form: G-2V	Specimen Handling:
Transport Temperature: Frozen isolate: on dry ice	Shipping Requirements: Ship specimens in compliance with governmental regulations.
Billing
CPT Code: 87253	Fees:

Microbiology
Ringworm (Culture – Isolation)
Names of Related Agents: Trichophyton species, Microsporum species, etc.
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Test Includes: Isolation of fungus and identification by morphological and physiological tests.
Reporting
Results Available: 21-28 days	Contact #s: 512-458-7455 for prior approval Technical questions: 512-458-7586
Reference
Method: Slide culture and physiological tests for identification to species
Turnaround Time: 21-28 days	Reference Range: Negative
Limitations: Delay in transport of specimen could compromise isolation of organism.	Interpretation:
Specimen Requirements
Specimen Collection:	Sample Type: Clinical Specimen
Volume/Amount Required:	Preferred Specimen: Tissue; Scrapings; Nail; Hair
Collection/Preservation: No preservative	Storage Instructions: Transport specimen as soon as possible. These organisms are susceptible to lower temperatures so storage and transport should be at room temperature.
Causes for Rejection: Specimens received frozen, in formalin, or in culture medium will be rejected. Swabs are discouraged unless the only specimen available; submit swabs in 5 mL sterile saline.	Sample Container: Triple-contained. Sterile, leak-proof, 50 mL conical tube preferred for primary container. Skin scrapings, nail and hair clippings should be transported dry.
Sample Test Kit:	Availability: Testing available upon approval by Dr. Penfield.
Diagnostic Information: Approval for this testing must be obtained prior to shipping by telephoning Dr. Susan Penfield at 512-458-7455.
Specimen Submission
Required Request Form: G-2B	Specimen Handling:
Transport Temperature: Room temperature	Shipping Requirements: Triple-contained and packaged to meet requirements of DOT, USPS, PHS, and IATA for shipping of clinical specimens.
Billing
CPT Code: 87101	Fees:

Microbiology
Ringworm (Culture – Identification)
Names of Related Agents: Trichophyton species, Microsporum species, etc.
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Test Includes: Identification of fungus to species level by morphological and physiological tests.
Reporting
Results Available: 14-21 days	Contact #s: 512-458-7586
Reference
Method: Slide culture and physiological tests
Turnaround Time: 14-21 days	Reference Range: By report
Limitations:	Interpretation:
Specimen Requirements
Specimen Collection:	Sample Type:
Volume/Amount Required:	Preferred Specimen: Pure Culture
Collection/Preservation:	Storage Instructions:
Causes for Rejection:	Sample Container: Triple-contained
Sample Test Kit:	Availability: Tested 5 days/week: Monday-Friday
Diagnostic Information: Fungal isolates (pure culture) submitted to this Laboratory for definitive identification. Drug susceptibility testing on these organisms not available at TDSHS laboratory.
Specimen Submission
Required Request Form: G-2B	Specimen Handling:
Transport Temperature: Room temperature	Shipping Requirements: Triple-contained and packaged to meet rigorous performance tests as outlined in the DOT, USPS, PHS, and IATA regulations for shipping of infectious substances.
Billing
CPT Code: 87106	Fees:

Microbiology
Rocky Mountain Spotted Fever (Serological – Immunofluorescence Assay)
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Test Includes:
Reporting
Results Available: 3-5 days	Contact #s:
Reference
Method: IFA
Turnaround Time: 3-5 days	Reference Range: <1:64 (Nonreactive)
Limitations: May not detect a recent infection, or infection in a person with a severely compromised immune system.	Interpretation: Nonreactive indicates that the patient does not have detectable antibody to the infectious agent. Reactive indicates that the patient has detectable antibody to the infectious agent, and depending on the clinical picture, may have a current or past infection.
Specimen Requirements
Specimen Collection: Venipuncture	Sample Type: Serum
Volume/Amount Required: 2 mL Serum	Preferred Specimen: Single Serum; Paired Sera
Collection/Preservation: Red top or tiger top tube	Storage Instructions: Separated serum may be held at 2-8°C
Causes for Rejection: Discrepancy between name on tube and name on form, insufficient quantity of serum for testing	Sample Container: Red top or tiger top tube
Sample Test Kit:	Availability: Test performed twice per week
Diagnostic Information: The rickettsial micro IFA test is a standard two-step sandwich immunofluorescence technique. In the first stage the Rickettsia rickettsii antigen is overlaid with dilutions of human serum. In the second stage, the antigen is overlaid with a fluorescein-conjugates antihuman globulin, so that the antigens are rendered fluorescent by positive sera. The most convincing evidence of recent rickettsiae infection of a four-fold rise in titier between the acute serum and the convalescent serum. Single titers of 1:128 are considered the minimum for significant titers. Serum specimens must be collected 14 days apart. The test is performed twice per week.
Specimen Submission
Required Request Form: G-2A	Specimen Handling: Use Universal Precautions
Transport Temperature: Cold (2-8º C) on ice packs if received within 48 hours from time of collection. Frozen (=-20°) on dry ice if received more than 48 hours from time of collection.	Shipping Requirements: Triple contain, separated serum may be shipped on cold packs (2-8°C), or frozen (-20°C) and mailed on dry ice.
Billing
CPT Code: 86757	Fees:

Microbiology
Rotavirus (Microscopic – Electron Microscopy)
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Test Includes: Electron Microscopy
Reporting
Results Available: 1-2 days	Contact #s: 512-458-7594
Reference
Method: Electron Microscopy
Turnaround Time: 1-2 days	Reference Range: No virus detected by electron microscopy.
Limitations:	Interpretation:
Specimen Requirements
Specimen Collection: Specimens should be collected at an appropriate anatomic site and at the proper time after infection because viruses are generally shed for only a short period of time. Refer to Specimen Collection by Type table for additional instructions.	Sample Type: See preferred specimens.
Volume/Amount Required: 2-4g of stool	Preferred Specimen: Feces
Collection/Preservation: Viral transport media	Storage Instructions: Maintain specimens at 2-8°C immediately after collection, ship with the least possible delay.
Causes for Rejection: Specimens submitted on a preservative such as formalin.	Sample Container: Sterile container
Sample Test Kit:	Availability: Monday - Friday
Diagnostic Information: Specimens are concentrated onto grids and stained with phosphotungstic acid to allow visualization of rotavirus particles.
Specimen Submission
Required Request Form: G-2A	Specimen Handling:
Transport Temperature: 2-8°C overnight	Shipping Requirements: Ship specimens in compliance with governmental regulations.
Billing
CPT Code: 88348	Fees:

Microbiology
Rubella (Immune Status Only, for Maternal Child Health Clients) (Serological – Enzyme Immunoassay)
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Test Includes:
Reporting
Results Available: 1-2 days	Contact #s:
Reference
Method: EIA
Turnaround Time: 1-2 days	Reference Range: < 10 IU/mL (Nonreactive)
Limitations: May not detect a recent immunization or infection, or immune status in a person with a severely compromised immune system.	Interpretation: Nonreactive indicates that the patient does not have detectable antibody to the infectious agent. Reactive indicates that the patient has detectable antibody to the infectious agent, and depending on the clinical picture, may have a current or past infection.
Specimen Requirements
Specimen Collection: Venipuncture	Sample Type: Serum
Volume/Amount Required: 2 mL Serum	Preferred Specimen: Single Serum
Collection/Preservation: Red top or tiger top tube	Storage Instructions: Separated serum may be held at 2-8°C
Causes for Rejection: Discrepancy between name on tube and name on form, insufficient quantity of serum for testing	Sample Container: Red top or tiger top tube
Sample Test Kit:	Availability: Test performed daily
Diagnostic Information: Patient results equal to or greater than 10 IU/mL indicate either past exposure to rubella virus, or vaccination and probable protection from clinical infection. Antibody levels < 10 IU/mL may be insufficient to provide protection from rubella virus infection. Single specimens for immune status determination are accepted only from health units in the Rubella Screening Program and TDSHS employees. The test is performed daily.
Specimen Submission
Required Request Form: G-2A	Specimen Handling: Use Universal Precautions
Transport Temperature: Cold (2-8º C) on ice packs if received within 48 hours from time of collection. Frozen (=-20°) on dry ice if received more than 48 hours from time of collection.	Shipping Requirements: Triple contain, separated serum may be shipped on cold packs (2-8°C), or frozen (-20°C) and mailed on dry ice.
Billing
CPT Code: 86762	Fees:

Microbiology
Rubella (Culture – Isolation)
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Test Includes: Cell culture
Reporting
Results Available: 7-21 days	Contact #s: 512-458-7594
Reference
Method: Cell Culture
Turnaround Time: 7-21 days	Reference Range: No virus isolated
Limitations:	Interpretation: A result of “No virus isolated” does not necessarily mean absence of a viral agent. The success of virus isolation depends a great deal on the submission of the proper specimen, collected at the right time, adequately maintained, and shipped with the least possible delay.
Specimen Requirements
Specimen Collection: Specimens should be collected at an appropriate anatomic site and at the proper time after infection because viruses are generally shed for only a short period of time. Refer to Specimen Collection by Type table for additional instructions.	Sample Type: See preferred specimens.
Volume/Amount Required: 10-20 mLs of urine, respiratory specimens in 2-4 mLs of viral transport media, 2-5 mL of CSF	Preferred Specimen: Urine; throat or nasopharyngeal swab; CSF
Collection/Preservation:	Storage Instructions: Arriving < 48 hours after collection, store and send at 2-8° C. Arriving > 48 hours after collection, store and send at -70° C (dry ice).
Causes for Rejection: Specimens submitted on a preservative such as formalin.	Sample Container: Sterile container
Sample Test Kit:	Availability: Monday - Friday
Diagnostic Information: VERO cell monolayers are inoculated in addition to the variety of cell cultures routinely inoculated. Multiple passages may be required before a final result is available. Identification tests using rubella-specific monoclonal antibody are done at routine intervals during the isolation process.
Specimen Submission
Required Request Form: G-2V	Specimen Handling:
Transport Temperature: Arriving <48 hours: 2-8° C Arriving >48 hours: send on dry ice	Shipping Requirements: Ship specimens in compliance with governmental regulations.
Billing
CPT Code: 87252	Fees:

Microbiology
Rubella (Culture – Identification)
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Test Includes: Immunofluorescence
Reporting
Results Available: 7-21 days	Contact #s: 512-458-7594
Reference
Method: Immunofluorescence
Turnaround Time: 7-21 days	Reference Range: By report
Limitations:	Interpretation:
Specimen Requirements
Specimen Collection:	Sample Type:
Volume/Amount Required: If transporting on dry ice, send 1-2 mLs.	Preferred Specimen: Cell culture tube with CPE.
Collection/Preservation:	Storage Instructions: Store isolate at -70° C.
Causes for Rejection:	Sample Container: Cell culture tube or sterile cryovial.
Sample Test Kit:	Availability: Monday - Friday
Diagnostic Information: Identification is based on immunofluorescence test using rubella-specific monoclonal antibody.
Specimen Submission
Required Request Form: G-2V	Specimen Handling:
Transport Temperature: Frozen isolate: on dry ice	Shipping Requirements: Ship specimens in compliance with governmental regulations.
Billing
CPT Code: 87253	Fees:

Microbiology
Rubella, IgG or IgM (Serological – Enzyme Immunoassay)
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Test Includes:
Reporting
Results Available: 3-5 days	Contact #s:
Reference
Method: EIA
Turnaround Time: 3-5 days	Reference Range: Nonreactive
Limitations: May not detect a recent infection, or infection in a person with a severely compromised immune system.	Interpretation: Nonreactive indicates that the patient does not have detectable antibody to the infectious agent. Reactive indicates that the patient has detectable antibody to the infectious agent, and depending on the clinical picture, may have a current or past infection.
Specimen Requirements
Specimen Collection: Venipuncture	Sample Type: Serum
Volume/Amount Required: 2 mL Serum	Preferred Specimen: Paired Sera; Single Serum
Collection/Preservation: Samples that will be delivered to the laboratory within 8 hours of collection may be transported at room temperature in the original blood collection tube. If the samples are going to be shipped and will be delivered to the laboratory within 48 hours of collection, sera must be separated from the blood and shipped on cold packs, between 2° and 8°C. If the serum samples will not be delivered to the laboratory within 48 hours of collection at these temperatures, then the samples must be frozen at -20°C or lower and shipped on dry ice.	Storage Instructions: Separated serum may be held at 2-8°C, or frozen at -20°C.
Causes for Rejection: Discrepancy between name on tube and name on form, insufficient quantity of serum for testing, specimens received with extended transit time, or received at incorrect temperature.	Sample Container: Red top or tiger top tube
Sample Test Kit:	Availability: Test performed twice per week
Diagnostic Information: A significant rise in rubella-specific IgG antibody level on paired sera collected 10-14 days apart or the presence of significant Rubella-specific IgM antibody level in single sera is evidence of current infection. Single serum for determination of Rubella-specific IgM level should be collected 3 days after onset. Test is performed twice per week.
Specimen Submission
Required Request Form: G-2A	Specimen Handling: Use Universal Precautions
Transport Temperature: Cold (2-8º C) on ice packs if received within 48 hours from time of collection. Frozen (=-20°) on dry ice if received more than 48 hours from time of collection.	Shipping Requirements: Triple contain, separated serum may be shipped on cold packs (2-8°C), or frozen (-20°C) and mailed on dry ice.
Billing
CPT Code: 87253	Fees:

Microbiology
Rubeola (Measles) (Culture – Isolation)
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Test Includes: Cell culture
Reporting
Results Available: 5-21 days	Contact #s: 512-458-7594
Reference
Method: Cell culture
Turnaround Time: 5-21 days	Reference Range: No virus isolated
Limitations:	Interpretation: A result of “No virus isolated” does not necessarily mean absence of a viral agent. The success of virus isolation depends a great deal on the submission of the proper specimen, collected at the right time, adequately maintained, and shipped with the least possible delay.
Specimen Requirements
Specimen Collection: Specimens should be collected at an appropriate anatomic site and at the proper time after infection because viruses are generally shed for a short period of time. Refer to Specimen Collection by Type table for additional instructions.	Sample Type: See preferred specimen
Volume/Amount Required: 10-20 mLs of urine, nasopharyngeal or throat swabs in 2-4 mLs of viral transport media	Preferred Specimen: Urine; Throat Swab; Nasopharyngeal Secretions
Collection/Preservation:	Storage Instructions: Arriving < 48 hours after collection, store and send at 2-8° C. Arriving > 48 hours after collection, store and send at -70° C (dry ice).
Causes for Rejection: Specimens submitted on a preservative such as formalin.	Sample Container: Sterile container
Sample Test Kit:	Availability: Monday - Friday
Diagnostic Information: B95a cell monolayers are inoculated in addition to the variety of cell cultures routinely inoculated. Multiple passages may be required before a final result is available. If characteristic CPE is observed, confirmation of identification will be performed.
Specimen Submission
Required Request Form: G-2V	Specimen Handling:
Transport Temperature: Arriving less than 48 hours: send at 2-8° C, Arriving greater than 48 hours: send on dry ice	Shipping Requirements: Ship specimens in compliance with governmental regulations.
Billing
CPT Code: 86752	Fees:

Microbiology
Rubeola (Measles) (Culture – Identification)
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Test Includes: Immunofluorescence
Reporting
Results Available: 10-14 days	Contact #s: 512-458-7594
Reference
Method: Immunofluorescence
Turnaround Time: 10-14 days	Reference Range: By report
Limitations:	Interpretation:
Specimen Requirements
Specimen Collection:	Sample Type:
Volume/Amount Required: Fill monolayer tube with media if transporting at ambient temperature. If transporting on dry ice, send 1-2 mLs.	Preferred Specimen: Cell culture isolate with CPE.
Collection/Preservation:	Storage Instructions: If shipment of isolate will be delayed, store at -70° C.
Causes for Rejection:	Sample Container: Cell culture tube or sterile cryovial.
Sample Test Kit:	Availability:
Diagnostic Information: Identification is based on immunofluorescence test using rubeola-specific monoclonal antibody.
Specimen Submission
Required Request Form: G-2V	Specimen Handling:
Transport Temperature: Monolayer with CPE: ambient temperature Frozen isolate: on dry ice.	Shipping Requirements: Ship specimens in compliance with governmental regulations.
Billing
CPT Code: 86753	Fees:

Microbiology
Rubeola (Measles), IgG or IgM (Serological – Enzyme Immunoassay)
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Test Includes:
Reporting
Results Available: 5-7 days	Contact #s:
Reference
Method: EIA
Turnaround Time: 5-7 days	Reference Range: <1.00 (Nonreactive)
Limitations: May not detect a recent infection, or infection in a person with a severely compromised immune system.	Interpretation: Nonreactive indicates that the patient does not have detectable antibody to the infectious agent. Reactive indicates that the patient has detectable antibody to the infectious agent, and depending on the clinical picture, may have a current or past infection.
Specimen Requirements
Specimen Collection: Venipuncture	Sample Type: Serum. CSF
Volume/Amount Required: 2 mL Serum	Preferred Specimen: Paired Sera; Single Serum; Spinal Fluid
Collection/Preservation: Sterile tube for CSF. Samples that will be delivered to the laboratory within 8 hours of collection may be transported at room temperature in the original blood collection tube. If the samples are going to be shipped and will be delivered to the laboratory within 48 hours of collection, sera must be separated from the blood and shipped on cold packs, between 2° and 8°C. If the serum samples will not be delivered to the laboratory within 48 hours of collection at these temperatures, then the samples must be frozen at -20°C or lower and shipped on dry ice.	Storage Instructions: Separated serum may be held at 2-8°C or frozen at -20°C. Freeze CSF immediately.
Causes for Rejection: Discrepancy between name on tube and name on form, insufficient quantity of serum for testing, specimens received with extended transit time, or received at incorrect temperature.	Sample Container: Red top or tiger top tube
Sample Test Kit:	Availability: Test performed once per week
Diagnostic Information: A significant rise in measles-specific IgG antibody level on paired sera collected 10-14 days apart or the presence of significant measles-specific IgM antibody level on single serum indicates current infection. Single serum for determination of measles-specific IgM should be collected 4 days after onset. Spinal fluid is specimen of choice for diagnosing subacute sclerosing panencephalitis. Test is performed once per week.
Specimen Submission
Required Request Form: G-2A	Specimen Handling: Use Universal Precautions
Transport Temperature: Cold (2-8º C) on ice packs if received within 48 hours from time of collection. Frozen (=-20°) on dry ice if received more than 48 hours from time of collection.	Shipping Requirements: Triple contain, separated serum may be shipped on cold packs (2-8°C), or frozen (-20°C) and mailed on dry ice.
Billing
CPT Code: 86765	Fees:

Microbiology Laboratory Tests: R