Skip to content

Calcium Intake 24-Hour Quantitative Assessment (Serum-Based Proxy)

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

This test provides an estimate of your total calcium intake over a 24-hour period using blood-based measurements. It helps assess dietary calcium absorption and potential deficiencies.

Quick summary

["This test helps doctors check if your diet may be affecting your calcium levels over time."]

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

Key facts at a glance

LOINC
61436-2
Short code
PhenX calcium intake ped proto
Synonyms
PhenX calcium intake ped proto
Category
electrolyte
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
8.5
Ref high
10.5
Critical range
6 N/A – 14 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
phenx
CPT
82310
SNOMED
110744001
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

How This Test Works

Your blood sample is analyzed to measure certain markers related to calcium metabolism. While not a direct measurement of dietary intake, these markers help estimate how much calcium your body absorbs from food.

Why It’s Ordered

Doctors may order this test if you have symptoms like bone pain, muscle weakness, or if you’re at risk for calcium-related conditions (e.g., osteoporosis, kidney issues). It’s also used in research or specialized dietary studies.

What to Expect Before the Test

No special preparation is needed. A simple blood draw is all that’s required. If you’re on long-term calcium supplements, your doctor may ask you to stop temporarily to avoid interference.

What the Results Mean

Results don’t directly show your exact calcium intake but provide a general idea of how your body processes dietary calcium. High or low markers may suggest dietary habits or health conditions affecting absorption.

Reference range

Adult: 8.5-10.5 mg/dLN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Calcium Intake Estimate

Frequently asked questions

Why do I need this test if I’m not showing obvious symptoms?
Even without noticeable symptoms, your doctor may order this test to check long-term dietary habits or metabolic health, especially if you have a history of bone-related issues or are part of a research study.
Can I change my diet before the test?
Yes, but discuss it with your doctor first. Avoid major dietary changes (like drastically cutting calcium) to ensure accurate results. If you’re on supplements, temporary cessation may be advised.
Will this test show if I’m getting enough calcium from food?
No, this test estimates calcium absorption, not direct dietary intake. It’s a proxy measure and should be interpreted alongside other health factors like diet history, symptoms, and lab 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