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Urinary Creatinine, Mass Concentration — Body-Mass Adjusted

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

Measures the concentration of creatinine in urine. It helps evaluate urine concentration and may be used to standardize urine protein or albumin measurements.

Quick summary

["Urine creatinine helps doctors interpret other urine test results and account for differences in body size and muscle mass."]

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

Key facts at a glance

LOINC
78763-0
Short code
OPC3373 adj bodymass+crea Ur-mCnc
Synonyms
OPC3373 adj bodymass+crea Ur-mCnc
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 the amount of creatinine in a urine sample. Creatinine is a waste product produced by the muscles and is commonly used to assess how concentrated a urine specimen is.

Why might I need this test?

Urine creatinine may be measured to check kidney function or to help interpret urine protein and albumin results. A body-mass-adjusted result may account for differences related to body size and muscle mass.

How is the test performed?

A urine specimen is collected and the creatinine concentration is measured in the laboratory. The exact collection format, such as a spot sample or timed collection, depends on the instructions provided by your healthcare professional.

How do I prepare for the test?

Follow your healthcare professional's urine collection instructions exactly. Tell the laboratory if you are pregnant, have a urinary infection, take medicines or supplements, or exercised heavily, because these factors can affect the result.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A lower creatinine concentration may occur with dilute urine, low fluid intake, or lower muscle mass. A higher concentration may occur with dehydration, recent exercise, a high-protein diet, or certain medicines. Your healthcare professional will interpret the result with your other tests and clinical information.

Short name

Urine creatinine

Frequently asked questions

Is this the same as a blood creatinine test?
No. This test measures creatinine in urine, while a serum or plasma creatinine test measures creatinine in blood.
Why is urine creatinine useful with a urine protein or albumin test?
Creatinine indicates how concentrated the urine is. Using it as a reference helps account for variations in urine concentration when interpreting protein or albumin results.
Does body-mass adjustment change the urine collection method?
Usually not. The adjustment changes how the result is reported or interpreted, but the collection instructions still depend on the type of urine sample requested.
  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