Luteinizing Hormone (LH)/Creatinine Ratio, 24-Hour Urine
Measures urinary luteinizing hormone (LH) relative to creatinine in a 24-hour collection, accounting for differences in urine concentration.
["This test evaluates the amount of LH released into urine over 24 hours, which can help assess reproductive hormone patterns."]
Key facts at a glance
- LOINC
- 29157-5
- Short code
- LH/Creat 24h Ur-Rto
- Synonyms
- LH/Creat 24h Ur-Rto
- Category
- kidney
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 1.5
- Ref high
- 9
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 83002
- 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 luteinizing hormone (LH) and creatinine in urine collected for 24 hours. The results are expressed as an LH-to-creatinine ratio, which helps account for variations in urine concentration.
Why might I need this test?
Urinary LH measurements may be used to evaluate reproductive hormone patterns, including the timing of ovulation. A clinician may order this test when information about the menstrual cycle or fertility is needed.
How is the test performed?
You collect all urine produced during a full 24-hour period. The laboratory measures LH and creatinine and calculates their ratio.
How do I prepare for the test?
Follow the collection instructions provided by your clinician or laboratory, including the exact starting and ending times. Usually, all urine during the collection period must be included, and the container may need refrigeration if instructed.
Reference range
Follicular: 1.5-9.0 mIU/mLN/A
For females: inform if menstrual cycle status. For certain tests, timing within menstrual cycle may matter.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
LH levels rise around ovulation, so changes in this measurement may reflect the phase of the menstrual cycle. Results are interpreted alongside symptoms, other hormone tests, and fertility assessments. An unexpectedly high or low value may also be affected by an incomplete collection or other medical factors.
Short name
24-Hour Urinary LH/Creatinine Ratio
Frequently asked questions
Why is creatinine included in this test?
How is a 24-hour urine collection completed?
Does an abnormal result mean there is a specific disorder?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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