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Tyrosine in Urine (24-Hour Collection)

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

This test measures the amount of tyrosine, a natural amino acid, found in your urine over a 24-hour period. It may be used to assess kidney function or metabolic processes.

Quick summary

["This test helps evaluate how well your body processes amino acids and supports kidney health."]

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

Key facts at a glance

LOINC
53119-4
Short code
Tyrosine Cry #/area UrnS HPF
Synonyms
Tyrosine Cry #/area UrnS HPF
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light-hpf
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test if they suspect a metabolic disorder, kidney issues, or other conditions affecting amino acid metabolism. It can also be part of a broader evaluation for conditions like phenylketonuria or other inherited metabolic diseases.

What to Expect Before the Test

You will need to collect all urine produced in a 24-hour period in a special container. Typically, you start the collection after urinating at a set time (often midnight or noon) and continue until you urinate again at the same time the next day. Drink plenty of fluids to help with collection accuracy.

During the Test

The collected urine sample is sent to a lab for analysis. The lab will measure the concentration of tyrosine in your urine. This is usually done using a specialized laboratory technique to ensure accuracy.

What the Results Mean

Results may be compared to a reference range provided by your healthcare provider. Elevated levels might suggest certain metabolic disorders or kidney problems, while lower levels could indicate other metabolic or health conditions. Your results will be interpreted in the context of your overall health and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

How is this test used in clinical practice?
This test is primarily used to diagnose or monitor conditions related to amino acid metabolism, such as phenylketonuria or other inherited metabolic disorders. It can also help assess kidney function and detect abnormalities in how the body processes amino acids.
What are the typical reference ranges?
Reference ranges for tyrosine in urine can vary by lab and individual health status. Your specific reference range will be provided by your healthcare provider based on your test results and clinical context.
Are there any risks or side effects associated with this test?
There are generally no risks associated with this test. The main consideration is ensuring accurate urine collection over the 24-hour period to get reliable results.
  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