Magnesium and Creatinine — Turbidimetric Assay
Measures magnesium and creatinine, commonly reported from serum or plasma, to help assess magnesium balance and kidney function.
["This test helps evaluate magnesium levels and how well the kidneys are filtering waste."]
Key facts at a glance
- LOINC
- 110577-4
- Short code
- Magnesium/Creat Msmt Ur
- Synonyms
- Magnesium/Creat Msmt Ur
- Category
- kidney
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 1.7
- Ref high
- 2.2
- Critical range
- 1 N/A – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 83735
- 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 two substances in blood: magnesium, an important mineral involved in muscle and nerve function, and creatinine, a waste product made by the muscles.
Why might I need this test?
A clinician may order this test to investigate symptoms such as weakness, cramps, confusion, or changes in urination. Magnesium can help assess mineral balance, while creatinine is commonly used to evaluate kidney function.
How is the test performed?
A blood sample is collected, usually by drawing blood from a vein. The laboratory analyzes the sample using a turbidimetric method, in which light passing through the sample is measured to determine the analyte level.
How do I prepare for the test?
Fasting is usually not required, but follow any instructions provided by the laboratory or clinician. Tell your clinician about medicines and supplements you take, particularly magnesium products, creatine, or NSAIDs, because they may affect results.
Reference range
Adult: 1.7-2.2 mg/dLN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A low magnesium level may occur with poor nutrition, vomiting, diarrhea, certain medicines, or other conditions that disrupt mineral balance. A high magnesium level may occur with kidney impairment or excessive magnesium intake. An elevated creatinine can reflect reduced kidney filtration, dehydration, or increased muscle mass, so results should be interpreted alongside the other parts of the medical evaluation.
Short name
Magnesium and Creatinine
Frequently asked questions
Does this test require fasting?
Can medicines affect the results?
What does an abnormal creatinine result mean?
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