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Free Inositol-to-Creatinine Ratio, Serum

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

This blood test measures the amount of free inositol relative to creatinine in serum, providing context about inositol levels and kidney function.

Quick summary

["The result is best interpreted with other laboratory tests because changes may reflect inositol metabolism, kidney function, hydration, or medications."]

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

Key facts at a glance

LOINC
74890-5
Short code
Inositol Free/Creat Ur-sRto
Synonyms
Inositol Free/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 test measures free inositol relative to creatinine in a serum sample. Inositol is a compound involved in cell signaling and metabolism, while creatinine is a waste product filtered by the kidneys.

Why might I need this test?

A clinician may order this test to evaluate inositol metabolism or to monitor a condition or treatment that could affect inositol levels. The result may also be considered when assessing kidney function or nutritional status.

How is the test performed?

A blood sample is collected, and the laboratory separates serum and measures free inositol and creatinine using validated testing methods. The laboratory then calculates their ratio.

How do I prepare for the test?

Fasting is usually not required, but follow any specific instructions from your clinician or laboratory. Tell the healthcare team about medicines or supplements you are taking because some may affect the result.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Free Inositol-to-Creatinine Ratio

Frequently asked questions

What does a ratio test show?
It compares the measured amount of free inositol with the amount of creatinine in the same serum sample. This can help provide context when inositol and kidney function are both relevant.
Do I need to fast before this test?
Fasting is generally unnecessary unless your clinician or laboratory gives different instructions. Always follow the preparation instructions included with your test order.
Can an abnormal result diagnose a specific condition?
No, this result is not diagnostic by itself. Your clinician will interpret it with your symptoms, medical history, medications, and other laboratory findings.
  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