Methionine

ChemistryAlso known as: L-MethionineAlso known as: 2-Amino-4-methylthiobutanoic acidmg/dL

Measures the amount of methionine excreted in serum or plasma.

Normal Range
0.1 – 0.5 mg/dL
mg/dL
Abnormal Levels
Consult your provider
Specimen Type
Blood

Why This Biomarker Matters

Abnormal methionine levels may indicate kidney disease, metabolic disorders, malnutrition, or liver dysfunction. Testing helps assess protein metabolism and nutritional status.

Understanding Your Results

Normal Range

0.1 – 0.5 mg/dL

Overview

Methionine is an essential amino acid obtained from dietary protein that plays a key role in protein synthesis and methylation reactions vital for cell function. A urine methionine test measures excretion levels, reflecting protein metabolism and kidney function. Elevated levels may indicate excessive protein intake, kidney disease, or metabolic disorders. Low levels may suggest nutritional deficiency, malabsorption, or liver disease. This test helps assess amino acid metabolism and nutritional status.

Technical Information (LOINC Codes)

Standardized laboratory codes for this biomarker

20651-6Primary
Methionine [Moles/volume] in Serum or Plasma
umol/L
2623-7
Methionine [Mass/volume] in Urine
mg/dL
26963-9
Methionine [Moles/volume] in Urine
nmol/mL
2621-1
Methionine [Presence] in Serum or Plasma
2624-5
Methionine [Mass/time] in 24 hour Urine
mg/(24.h)
47700-0
Methionine [Moles/volume] in DBS
umol/L
2622-9
Methionine [Mass/volume] in Serum or Plasma
mg/dL
25476-3
Methionine [Moles/time] in 24 hour Urine
umol/(24.h)
22716-5
Methionine [Moles/volume] in Specimen
umol/L
22648-0
Methionine [Moles/volume] in Cerebral spinal fluid
umol/L
55943-5
Methionine [Moles/mass] in Hair
umol/g
13376-9
Methionine [Mass/volume] in Cerebral spinal fluid
mg/dL
63380-0
Methionine [Presence] in DBS
13405-6
Methionine [Mass/volume] in Amniotic fluid
mg/dL
17264-3
Methionine [Presence] in Urine
25956-4
Methionine [Moles/volume] in 24 hour Urine
umol/L
2620-3
Methionine [Presence] in Blood
26844-1
Methionine [Moles/volume] in Amniotic fluid
umol/dL
27098-3
Methionine [Presence] in 24 hour Urine
32257-8
Methionine [Moles/volume] in Vitreous fluid
umol/L
32258-6
Methionine [Moles/volume] in Body fluid
umol/L
47199-5
Methionine [Mass] of Dose
mg

Available Lab Tests

Order tests that measure this biomarker

Amino Acids (Plasma)

$193.00
Results in 3-7 business days