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Maple Syrup Urine Disease (MSUD) Therapy Monitoring Panel, Serum/Plasma

Published: August 9, 2026Updated: August 16, 2026

A blood test that measures amino acids involved in maple syrup urine disease to help monitor treatment and nutritional balance.

Quick summary

["This panel helps your care team check whether MSUD treatment is keeping disease-related amino acids under control."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
94566-7
Short code
MSUD therapy monitor Pnl SerPl
Synonyms
MSUD therapy monitor Pnl SerPl
Category
urine
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This test measures amino acids in serum or plasma that are relevant to maple syrup urine disease, including branched-chain amino acids. It is used to follow treatment and nutritional management.

Why might I need this test?

People with maple syrup urine disease must carefully control protein and branched-chain amino acid intake. Regular monitoring can show whether levels are appropriately controlled and help the care team adjust diet or medication.

How is the test performed?

A blood sample is collected, separated into serum or plasma, and analyzed to measure the amino acids included in the panel. The results are interpreted along with diet, symptoms, and other medical information.

How do I prepare for the test?

The laboratory may request a fasting or timed blood sample, especially when the result will be compared with a specific meal or dose schedule. Follow the instructions provided by your care team and tell the laboratory if the sample was taken after a recent meal or supplement.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Higher-than-desired amino acid levels may indicate that dietary protein or branched-chain amino acid intake needs adjustment, or that treatment is not providing adequate control. Lower-than-desired levels can also occur when dietary restriction is too strict. Results should be interpreted by a clinician familiar with the individual’s MSUD treatment plan.

Short name

MSUD therapy monitoring panel

Frequently asked questions

What is maple syrup urine disease?
Maple syrup urine disease is an inherited condition in which the body cannot properly break down several amino acids, especially leucine, isoleucine, and valine. These substances can accumulate if the condition is not well controlled.
Why is this panel monitored regularly?
Regular monitoring helps the care team balance the need to prevent amino acid buildup with the need to maintain adequate nutrition. It can guide changes to diet, medical therapy, or supplement use.
Do I need to fast before this test?
Fasting requirements depend on the laboratory and the reason for testing. Some collections are intentionally timed in relation to meals or medication, so follow the specific instructions given for your test.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy