Skip to content

Calcium24hstlscnc

Published: July 31, 2026Updated: August 16, 2026

A test that measures the amount of calcium in your stool over a 24-hour period to evaluate how your body absorbs and processes calcium.

Quick summary

{"Measures calcium excretion in stool collected over 24 hours","Helps diagnose conditions affecting calcium absorption","Collect all stool in the provided container for accurate results","Avoid certain foods and medications before the test","Results help doctors assess digestive health and calcium metabolism"}

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

Key facts at a glance

LOINC
2001-6
Short code
STOOL CA
Synonyms
Calcium 24h Stl-sCnc
Category
electrolyte
Sample
stool
Container
Clean, dry, wide-mouthed plastic or glass stool container (no preservatives)
Units
not specified
Ref low
2.5
Ref high
7.5
Critical range
6 not specified – 14 not specified
Fasting
false
Population
adult
Sex
all
Age range
0–120 years
Method
Atomic absorption spectrometry (AAS) or Inductively coupled plasma mass spectrometry (ICP-MS)
CPT
82495
SNOMED
271565004
Specimen volume
Entire 24-hour stool collection (typically 50-300 g depending on individual)
Stability
Room temperature: 24-48 hours; Refrigerated (2-8°C): 5-7 days; Frozen (-20°C): 30 days
TAT
24–72 hours
Order
routine

What is this test?

The 24-hour stool calcium test is a laboratory test that measures the amount of calcium excreted in your stool over a 24-hour period. Normally, the intestines absorb dietary calcium, and a small amount passes into the stool. This test helps doctors understand if your body is absorbing calcium properly or if there are problems with your digestive system.

How is the test performed?

You will receive a special collection container from your healthcare provider. For 24 hours, all stool must be collected in this container. It is important to keep the container refrigerated or in a cool place during the collection period. After 24 hours, return the complete container to the laboratory as instructed. Do not urinate into the collection container, as this can contaminate the sample.

How to prepare for the test?

Your doctor may ask you to maintain your normal diet for a few days before and during the collection period. Some medications, such as antacids containing calcium, laxatives, or certain supplements, may need to be avoided. Inform your doctor about all medications and supplements you are taking. Follow any specific instructions provided by your healthcare team.

What do the results mean?

Normal calcium levels in stool vary depending on dietary intake and individual metabolism. Abnormally high stool calcium may indicate conditions such as malabsorption syndromes, celiac disease, pancreatitis, or certain intestinal disorders. Abnormally low levels may be associated with excessive calcium supplementation or certain metabolic conditions. Your doctor will interpret your results in context with your overall health and other test findings.

Are there any risks?

This test carries no medical risks. The main challenge is accurately collecting all stool over the 24-hour period. The procedure is non-invasive and does not cause any discomfort. If you have difficulty collecting the sample, speak with your healthcare provider for guidance.

Reference range

Not established (lab-specific)not specified

Specimen: stool

Complete 24-hour stool collection required; maintain usual diet; discontinue calcium supplements and antacids 24-48 h prior if possible; no fasting needed

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Why do I need to collect stool for 24 hours?
A 24-hour collection provides a more accurate assessment of daily calcium excretion than a single sample. Calcium levels can vary throughout the day, so collecting all stool over 24 hours gives a complete picture of your calcium metabolism.
Can I continue my normal activities during collection?
Yes, you can continue most normal activities. Simply carry the collection container with you and use it whenever you have a bowel movement. Keep it refrigerated or in a cool bag when away from home.
What if I miss a collection during the 24-hour period?
It is important to collect all stool during the designated period. If you miss a collection, inform your healthcare provider. They may ask you to start the collection over or use the partial sample if most has been collected.
How long does it take to get results?
Results are typically available within a few days after the sample reaches the laboratory. Your doctor will contact you with the results or discuss them at your follow-up appointment.
Does this test hurt?
No, this test is completely painless. It only requires collecting stool as you normally would, just in a special container instead of flushing it.
  1. 1
    MedlinePlus - Calcium in StoolSource
  2. 2
    Mayo Clinic Laboratories - Calcium, FecalSource
  3. 3
    Lab Tests Online - Stool TestsSource

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