Skip to content

Lactate and Creatinine, 24-Hour Urine

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

Measures lactate and creatinine in urine collected for 24 hours. Creatinine may help account for differences in urine concentration.

Quick summary

["This test measures how much lactate and creatinine are released in the urine over a full day."]

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

Key facts at a glance

LOINC
44333-3
Short code
Lactate/Creat 24h Ur
Synonyms
Lactate/Creat 24h Ur
Category
kidney
Sample
urine
Container
Sterile urine container
Units
N/A
Critical range
— – 4 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 lactate and creatinine in all urine collected over 24 hours. Lactate reflects the amount of a lactate-related substance passing into the urine, while creatinine can help account for how concentrated the urine is.

Why might I need this test?

A clinician may use this test to evaluate lactate excretion or to interpret another urine result relative to creatinine. It may be considered alongside symptoms, medical history, blood tests, and other urine measurements.

How is the test performed?

You collect all urine produced during a specified 24-hour period in a labeled container provided by the laboratory. The collection time and any missed samples are recorded, and the urine is then sent to the laboratory for measurement.

How do I prepare for the test?

Follow the laboratory's collection instructions carefully, including the start and end times. Drink fluids normally unless your clinician tells you otherwise, and tell the laboratory about medicines or supplements that could affect the results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings2

Short name

24-Hour Urine Lactate and Creatinine

Frequently asked questions

Do I need to fast for this test?
Fasting is generally not required unless your clinician specifically instructs you to fast. Follow the timing and medication instructions provided with the 24-hour urine collection kit.
What happens if I miss part of the urine collection?
Tell the laboratory or your clinician, because an incomplete collection can make the results less reliable. Do not try to estimate or replace the missing urine unless you receive instructions to do so.
How should the urine sample be handled?
Store and transport it exactly as instructed, which may include refrigeration and prompt delivery. Label the container with the collection times and bring the completed collection to the designated location.
  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