Tryptophan

ChemistryAlso known as: L-TryptophanAlso known as: 2-Amino-3-(3-indolyl)propionic AcidN/A

Screens for abnormal tryptophan levels in blood.

Normal Range
Consult your provider
N/A
Abnormal Levels
Consult your provider
Specimen Type
Blood

Why This Biomarker Matters

Tryptophan deficiency can impair serotonin production, affecting mood and sleep. Low levels may indicate malnutrition, malabsorption, or liver disease requiring further investigation.

Overview

Tryptophan is an essential amino acid your body obtains from dietary protein and cannot produce on its own. This qualitative test screens for abnormal tryptophan levels, which may indicate nutritional deficiency, malabsorption, liver disease, or rare metabolic disorders. Tryptophan is important for producing serotonin, a neurotransmitter affecting mood and sleep, and niacin, a B vitamin essential for energy metabolism. Abnormalities may affect mental health, immune function, and overall protein metabolism.

Technical Information (LOINC Codes)

Standardized laboratory codes for this biomarker

3069-2Primary
Tryptophan [Presence] in Serum or Plasma
17752-7
Tryptophan [Presence] in Urine
25546-3
Tryptophan [Moles/time] in 24 hour Urine
umol/(24.h)
3070-0
Tryptophan [Mass/volume] in Serum or Plasma
mg/dL
26602-3
Tryptophan [Moles/volume] in Cerebral spinal fluid
umol/L
20659-9
Tryptophan [Moles/volume] in Serum or Plasma
umol/L
53159-0
Tryptophan [Moles/volume] in DBS
umol/L
74767-5
Tryptophan [Moles/volume] in Platelet rich plasma
nmol/L
13418-9
Tryptophan [Mass/volume] in Amniotic fluid
mg/dL
9325-2
Tryptophan [Moles/volume] in 24 hour Urine
mmol/L
27135-3
Tryptophan [Moles/volume] in Amniotic fluid
umol/dL
3068-4
Tryptophan [Mass/volume] in Cerebral spinal fluid
mg/dL
3072-6
Tryptophan [Mass/volume] in Urine
mg/dL
32275-0
Tryptophan [Moles/volume] in Body fluid
umol/L
34384-8
Tryptophan [Moles/volume] in Urine
umol/L

Available Lab Tests

Order tests that measure this biomarker

Amino Acids (Plasma)

$193.00
Results in 3-7 business days