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Laboratory Test Directory

Maple Syrup Disease Monitor


Name Method Department Units
MSUD Monitor High performance liquid chromatography
Core Lab, Metabolic chemistry umol/L

Specimen Requirements

Serum Spun, Plasma Spun

Container Type Container Size Specimen Volume

Red tube, (no anticoagulant), No Gel

3 mL 3 mL

Green tube (Lithium heparin), No Gel

3 mL 3 mL

Refrigerated - 4 hour(s)
Frozen - Indefinite week(s)

Specimen Preparation

  • Centrifuge, remove plasma/serum and freeze
  • Transport to laboratory as soon as possible

Reasons for Rejection

  • Wrong collection tube
  • Collected in tube with gel separator
  • Not received at proper temperature
  • Not received within specified time frame


This test is limited to patients with known MSUD; NOT for diagnostic purposes. A serum amino acid profile (QAAS) is the recommended test for the follow-up to an abnormal newborn screening test.

CPT Code

  • 82136