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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. For more information on how to collect blood spots, see the following:

-How to Collect Dried Blood Spot Samples via fingerstick.

-Blood Spot Collection Instructions-Fingerstick

-Blood Spot Collection Instructions-Fingerstick-Spanish

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, BS

Specimen Type

Whole blood

Specimen 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 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

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


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