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24-Hour Urine Calcium Excretion Rate

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

This test measures how much calcium is excreted in your urine over a full day. It helps assess kidney function and calcium balance in your body.

Quick summary

["Understanding your calcium excretion can help diagnose kidney issues or calcium-related disorders."]

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

Key facts at a glance

LOINC
14650-6
Short code
Citrate 24h Ur-sRate
Synonyms
Citrate 24h Ur-sRate
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
20
Ref high
400
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82670
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

Why This Test Is Done

Your doctor may order this test if you have symptoms like kidney stones, unexplained bone pain, or signs of calcium imbalance. It’s also used to monitor conditions like hyperparathyroidism or kidney disease.

What to Expect Before the Test

You’ll typically collect all your urine for 24 hours, starting from one morning. Drink plenty of fluids but avoid high-calcium foods or supplements unless instructed otherwise.

How the Test Works

The collected urine is tested for calcium concentration. The total amount excreted over 24 hours is calculated to determine your excretion rate.

Possible Results and Interpretation

Results are compared to standard ranges for healthy individuals. Abnormally high or low rates may signal underlying health concerns.

Reference range

Premenopausal: 20-400 pg/mL; Postmenopausal: <30 pg/mLN/A

Specimen: urine

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Calcium in urine over 24 hours

Frequently asked questions

What does a normal 24-hour urine calcium rate mean?
A normal rate falls within the expected range for healthy adults, meaning your kidneys are processing calcium efficiently. However, your doctor may still review it in relation to your overall health and symptoms.
Yes, foods high in calcium (like dairy products) or supplements can temporarily increase your urine calcium levels. Your doctor may give specific dietary instructions to ensure accurate results.
The frequency depends on your health condition. Your doctor may recommend it yearly or as needed based on your symptoms, medical history, or treatment plan.
There are no risks associated with this test. The only effort required is collecting urine over 24 hours, which can be done at home with guidance from your healthcare provider.
Yes, many healthcare providers allow you to collect urine at home. Follow your provider’s instructions carefully to ensure accurate results.
  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