Test ID MSUSC Branched-Chain Amino Acids, Self-Collect, Blood Spot
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. See Dried Blood Spot Collection Tutorial for how to collect blood spots.
Useful For
Monitoring patients with maple syrup urine disease using specimens collected at home
Method Name
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Portions of this test are covered by patents held by Quest Diagnostics
Reporting Name
Branched-Chain Amino Acids, SC, BSSpecimen Type
Whole bloodSpecimen Minimum Volume
1 Blood spot
Specimen 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 |
Reference Values
Allo-isoleucine: <2 nmol/mL
Leucine: 35-215 nmol/mL
Isoleucine: 13-130 nmol/mL
Valine: 51-325 nmol/mL
Day(s) Performed
Monday through Friday
Report Available
2 to 4 daysPerforming Laboratory

Test Classification
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
82136
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.