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HelpTest Code MBX Muscle Pathology Consultation
Ordering Guidance
This test is not appropriate for inhalation-transmission diseases such as tuberculosis, Brucella, measles, and varicella zoster. This test is also not appropriate for suspected Creutzfeldt-Jacobs Disease (CJD).
Additional Testing Requirements
Muscle biopsies from different anatomic sites require separate orders and separate specimen vials.
Shipping Instructions
Transport specimen per instructions in Muscle Biopsy Specimen Preparation Instructions.
Necessary Information
All requisition and supporting information must be submitted in English.
Each of the following items is required:
1. All requisitions must be labeled with:
-Patient name, date of birth, and medical record number
-Name and phone number of the referring pathologist or ordering provider
-Anatomic site and collection date
2. Muscle Histochemistry Patient Information (T361)
Specimen Required
Preferred:
Specimen Type: Frozen muscle biopsy tissue
Supplies: Muscle Biopsy Kit (T541)
Collection Instructions: Prepare and transport specimen per instructions in Muscle Biopsy Specimen Preparation Instructions.
Additional Information:
1. All specimens and additional paperwork must be labeled with:
-Two patient identifiers (first and last name, date of birth, or medical record number)
-Pathology accession/case number
-Anatomic site
2. Contact the Mayo Clinic Muscle Laboratory at 800-533-1710 for special problems to maximize benefit of the muscle biopsy.
Acceptable:
Specimen Type: Stained muscle biopsy slides
Collection Instructions:
1. Submit all stains performed on the case.
2. All specimens must be labeled with anatomic site.
Forms
Muscle Histochemistry Patient Information (T361) is required.
Useful For
Obtaining a rapid, expert opinion on muscle biopsy specimens for diagnosis of acquired or inherited muscle diseases
Guiding treatment and genetic testing, as well as investigating relevance of genetic variants of unknown significance
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| IHPCI | IHC Initial | No, (Bill Only) | No |
| IHPCA | IHC Additional | No, (Bill Only) | No |
| IFPCI | IF Initial | No, (Bill Only) | No |
| IFPCA | IF Additional | No, (Bill Only) | No |
| SS2PC | SpecStain, Grp II, other | No, (Bill Only) | No |
| SS3PC | SpecStain, Grp III, enzyme | No, (Bill Only) | No |
| HCFPC | SpecStain, frozen | No, (Bill Only) | No |
| COSPC | Consult, Outside Slide | No, (Bill Only) | No |
| CSPPC | Consult, w/Slide Prep | No, (Bill Only) | No |
| CUPPC | Consult, w/USS Prof | No, (Bill Only) | No |
| CRHPC | Consult, w/Comp Rvw of His | No, (Bill Only) | No |
| LV4RP | Level 4 Gross and Microscopic, RB | No, (Bill Only) | No |
Testing Algorithm
A battery of enzyme histochemical stains will be performed on frozen tissue; additional histochemical stains or immunostains may be performed on frozen tissue; other tests can be performed at an additional charge. The reviewing neuromuscular pathologist will determine the need for additional testing. The patient's provided clinical history, creatine kinase values, and electromyography results are helpful in guiding the additional tests.
For all consultations, ancillary testing necessary to determine a diagnosis is ordered at the discretion of the Mayo Clinic neuromuscular pathologist. An interpretation, which includes an evaluation of the specimen and determination of a diagnosis, will be provided within a formal pathology report.
Frozen tissue sent for consultation: Appropriate additional stains may be performed at an additional charge.
Slides sent for consultation: Special stains and studies performed on the case should be sent with the case for review. In order to determine an accurate diagnosis, some of these stains or studies may be deemed to warrant repeat testing, at an additional charge, at the discretion of the reviewing Mayo Clinic neuromuscular pathologist. The interpreting neuromuscular pathologist may also request frozen tissue to perform additional studies considered necessary for diagnosis.
Note: Testing requested by the referring physician (immunostains, etc) may not be performed if deemed unnecessary by the reviewing Mayo neuromuscular pathologist. Electron microscopic studies are not performed on muscle biopsy specimens. For more information see Why Electron Microscopy is Not Performed on Muscle Biopsy Specimens.
For more information see Pathology Consultation Ordering Algorithm.
Special Instructions
Reporting Name
Muscle Path ConsultSpecimen Type
VariesSpecimen Minimum Volume
1.5 cm biopsy
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Varies | Frozen (preferred) | ||
| Ambient | |||
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
An interpretive report will be provided.
Day(s) Performed
Monday through Friday
Report Available
3 to 14 days; Cases requiring additional material or ancillary testing may require additional time.Specimen Retention Time
6 monthsPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
88342 (if appropriate)
88341 (if appropriate)
88346 (if appropriate)
88350 (if appropriate)
88305 (if appropriate)
88313 (if appropriate)
88319 (if appropriate)
88314 (if appropriate)
88321 (if appropriate)
88323 (if appropriate)
88323-26 (if appropriate)
88325 (if appropriate)
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| MBX | Muscle Path Consult | 60570-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 601767 | Interpretation | 59465-5 |
| 601769 | Participated in the Interpretation | No LOINC Needed |
| 601770 | Report electronically signed by | 19139-5 |
| 601771 | Addendum | 35265-8 |
| 601773 | Gross Description | 22634-0 |
| 603614 | Material Received | 81178-6 |
| 601822 | Case Number | 80398-1 |
| 601911 | Disclaimer | 62364-5 |