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Glutamylphenylacetamidase/Creatinine Ratio, Stool

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

A stool test that measures glutamylphenylacetamidase activity relative to creatinine, helping account for differences in stool consistency and amount.

Quick summary

["This ratio measures a stool enzyme relative to creatinine; abnormal results require interpretation alongside symptoms and other tests."]

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

Key facts at a glance

LOINC
80094-6
Short code
Glutamyl-phe/Creat Ur-sRto
Synonyms
Glutamyl-phe/Creat Ur-sRto
Category
kidney
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

What is this test?

This is a stool test that measures glutamylphenylacetamidase activity compared with the amount of creatinine in the same sample. The ratio can help account for variations in how much stool is collected.

Why might I need this test?

A clinician may order this test when evaluating gastrointestinal symptoms, changes in bowel habits, or suspected malabsorption. It may be used as part of a broader assessment that also includes your medical history, physical examination, and other laboratory tests.

How is the test performed?

A small amount of stool is collected and sent to the laboratory for measurement. The laboratory determines the glutamylphenylacetamidase and creatinine values and calculates their ratio.

How do I prepare for the test?

Collect the stool sample in the container provided by the laboratory unless your clinician gives different instructions. Tell the laboratory if you recently used medicines that may affect bowel activity, and follow any specific preparation instructions you were given.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Glutamylphenylacetamidase/Creatinine Ratio

Frequently asked questions

Does this test require a bowel movement or enema?
Usually, a routine stool sample is all that is required. If your clinician requests a more specific collection method, follow the laboratory's instructions exactly.
Why is the result reported as a ratio?
The ratio compares the enzyme measurement with creatinine, which can vary with stool amount and consistency. This provides context that may make results from different samples easier to compare.
Can medications or diet affect the result?
Some medicines, dietary changes, and gastrointestinal illnesses may affect stool enzyme measurements. Tell your clinician about supplements, medicines, recent antibiotics, and major changes in bowel habits.
  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