Luteinizing Hormone/Creatinine Ratio, Urine
Measures urine luteinizing hormone relative to creatinine, helping account for differences in urine concentration during reproductive assessment.
["This test can help identify changes in luteinizing hormone activity, including a possible ovulation-related surge."]
Key facts at a glance
- LOINC
- 34334-3
- Short code
- LH/Creat Ur-Rto
- Synonyms
- LH/Creat 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?
Luteinizing hormone (LH) is a pituitary hormone that helps regulate the reproductive cycle and ovulation. This test measures the amount of LH in urine relative to creatinine, a substance used to help adjust for how concentrated the urine is.
Why might I need this test?
This test may be used to assess changes in LH activity when evaluating ovulation or reproductive timing. It can also help determine whether an LH result reflects a true hormone change or is influenced by unusually dilute or concentrated urine.
How is the test performed?
A urine specimen is collected and tested in the laboratory. The laboratory measures LH and creatinine and calculates their ratio.
How do I prepare for the test?
Follow your clinician's instructions about when and how to collect the urine sample, as collection time may be important. Ask whether you need to limit fluids before collection, and do not stop medications without medical advice.
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.
A higher LH-to-creatinine ratio may occur around the LH surge that precedes ovulation, but timing within the menstrual cycle is important. Lower or unexpected results may reflect the phase of the cycle, urine dilution, medications, or other factors. The result should be interpreted with other fertility tests and clinical findings rather than used alone to confirm ovulation or diagnose infertility.
Short name
Urine LH/Creatinine Ratio
Frequently asked questions
Does this test confirm that I ovulated?
Why is creatinine included in the test?
What medications can affect the result?
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