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Molybdenum/Creatinine Ratio, Urine — Mass/Mass

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

A urine test that measures molybdenum relative to creatinine, helping account for differences in urine concentration.

Quick summary

["This ratio can help assess molybdenum levels and possible exposure, particularly when urine concentration varies."]

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

Key facts at a glance

LOINC
110381-1
Short code
Molybdenum/Creat Msmt Ur
Synonyms
Molybdenum/Creat Msmt Ur
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?

Molybdenum is a trace mineral needed in small amounts for several enzymes. This test compares the amount of molybdenum with the amount of creatinine in urine. Creatinine is used as a marker of urine concentration.

Why might I need this test?

This test may be used to evaluate molybdenum levels, investigate possible exposure to molybdenum-containing products or supplements, or help assess nutritional status. It may also be part of an evaluation for unexplained symptoms.

How is the test performed?

A urine sample is collected according to the laboratory's instructions. The laboratory measures molybdenum and creatinine and calculates their mass-to-mass ratio. Collection may be a single urine sample or a timed collection, depending on the order.

How do I prepare for the test?

Follow the laboratory's urine-collection instructions and tell the clinician about molybdenum supplements, occupational or environmental exposure, and any other supplements you take. Do not stop prescribed supplements unless your clinician advises you to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Molybdenum/Creatinine Ratio

Frequently asked questions

What does the molybdenum/creatinine ratio measure?
It compares the amount of molybdenum with the amount of creatinine in urine. This adjustment helps account for how concentrated or dilute a urine sample is.
Do I need to stop taking molybdenum supplements before the test?
Do not stop supplements without medical guidance. Tell the ordering clinician and laboratory about all supplements so they can interpret the result in context.
Can diet or occupation affect the result?
Yes. Molybdenum from supplements, fortified foods, occupational exposure, or certain products can affect the result, so the healthcare professional may ask about these factors.
  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