Ornithine

ChemistryAlso known as: L-OrnithineAlso known as: OrnN/A

Measures the level of ornithine, an amino acid involved in nitrogen metabolism, in the blood.

Normal Range

Consult your provider

N/A

Abnormal Levels

Consult your provider

Specimen Type

Blood

Why This Biomarker Matters

Ornithine levels help detect inherited metabolic disorders affecting the urea cycle. Abnormal results can indicate the need for specialized dietary or medical management to prevent serious complications.

Overview

Ornithine is an amino acid involved in the urea cycle, which helps your body process and eliminate nitrogen waste. Measuring ornithine levels in blood helps assess amino acid metabolism and can identify rare genetic metabolic disorders. Abnormally high ornithine levels may indicate urea cycle disorders or other metabolic conditions, while very low levels are uncommon but can signal specific genetic defects. This test is typically ordered when metabolic or genetic screening is warranted.

Technical Information (LOINC Codes)

Standardized laboratory codes for this biomarker

2678-1Primary

Ornithine [Presence] in Serum or Plasma

27292-2

Ornithine [Moles/volume] in Urine

nmol/mL

47714-1

Ornithine [Moles/volume] in DBS

umol/L

2679-9

Ornithine [Mass/volume] in Serum or Plasma

mg/dL

25491-2

Ornithine [Moles/time] in 24 hour Urine

mmol/(24.h)

22725-6

Ornithine [Moles/volume] in Specimen

umol/L

22647-2

Ornithine [Moles/volume] in Cerebral spinal fluid

umol/L

20652-4

Ornithine [Moles/volume] in Serum or Plasma

umol/L

2681-5

Ornithine [Mass/time] in 24 hour Urine

mg/(24.h)

27219-5

Ornithine [Moles/volume] in Amniotic fluid

umol/dL

17389-8

Ornithine [Presence] in Urine

32260-2

Ornithine [Moles/volume] in Body fluid

umol/L

32261-0

Ornithine [Moles/volume] in Vitreous fluid

umol/L

40829-4

Ornithine [Presence] in Blood

13408-0

Ornithine [Mass/volume] in Amniotic fluid

mg/dL

25965-5

Ornithine [Moles/volume] in 24 hour Urine

mmol/L

13379-3

Ornithine [Mass/volume] in Cerebral spinal fluid

mg/dL

2680-7

Ornithine [Mass/volume] in Urine

mg/dL

Available Lab Tests

Order tests that measure this biomarker

Amino Acids (Plasma)

$193.00

Results in 3-7 business days