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HelpTest ID MSUSC Branched-Chain Amino Acids, Self-Collect, Blood Spot
Method Name
Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Portions of this test are covered by patents held by Quest Diagnostics
Necessary Information
Patient's street address, city, state, ZIP (postal) code, country, and home phone are required (post-office [PO] boxes are not acceptable delivery locations).
Specimen Required
Supplies: Blood Spot Collection-Self Collect (T858)
Container/Tube: Blood Spot Self Collection Card
Specimen Volume: 2 Blood spots
Collection Instructions:
1. Order test each time the patient is to collect a dried blood specimen at home and mail the specimen directly to Mayo Clinic Laboratories.
2. Order should be placed a minimum of 3 days prior to desired date of collection.
3. Enter patient's address information for each order created, including street address (post-office [PO] boxes are not acceptable delivery locations), city, state abbreviation, ZIP (postal) code, country, and home phone number.
4. For each order, the Blood Spot Collection-Self Collect kit will be mailed directly to the patient for self-collection (delivery to a PO box will not occur).
5. For more information on how to collect blood spots, see the following:
-How to Collect a Dried Blood Spot Sample via fingerstick.
-Blood Spot Collection Instructions-Fingerstick
-Blood Spot Collection Instructions-Fingerstick-Spanish
Reporting Name
Branched-Chain Amino Acids, SC, BSSpecimen Type
Whole bloodSpecimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Whole blood | Ambient (preferred) | 59 days | FILTER PAPER |
| Frozen | 59 days | FILTER PAPER | |
| Refrigerated | 59 days | FILTER PAPER |
Report Available
2 to 4 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| MSUSC | Branched-Chain Amino Acids, SC, BS | 94571-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 618731 | Allo-isoleucine | 94572-5 |
| 618732 | Leucine | 47679-6 |
| 618733 | Isoleucine | 47671-3 |
| 618734 | Valine | 47799-2 |
| 618730 | Reviewed By | 18771-6 |
| BG775 | Patient Street Address (No PO Box) | 56799-0 |
| BG776 | Patient City | 68997-6 |
| BG777 | Patient State | 46499-0 |
| BG778 | Patient Zip Code | 45401-7 |
| BG779 | Patient Country | 77983-5 |
| BG780 | Patient Home Phone | 42077-8 |
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.
Useful For
Monitoring patients with maple syrup urine disease using specimens collected at home
Day(s) Performed
Monday through Friday
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
0381U
Special Instructions
Specimen Minimum Volume
1 Blood spot
Reference Values
Allo-isoleucine: <4 nmol/mL
Leucine: 52-269 nmol/mL
Isoleucine: 22-167 nmol/mL
Valine: 84-414 nmol/mL