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Serum Calcium with Electrolyte Profile (including Sodium, Potassium, Chloride)

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

This blood test measures calcium and key electrolytes (sodium, potassium, chloride) to check your body’s mineral balance and kidney function.

Quick summary

["Helps assess hydration, heart health, and mineral imbalances that could affect your nerves and muscles."]

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

Key facts at a glance

LOINC
30884-1
Short code
XR Sacrum Views
Synonyms
XR Sacrum Views
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr
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

Why This Test Is Done

Your doctor may order this test to diagnose or monitor conditions like low or high calcium levels, kidney disease, heart rhythm issues, or dehydration. It’s also used before surgeries, during pregnancy, or if you have symptoms like muscle cramps, confusion, or irregular heartbeat.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the draw if your lab requires it. Bring any medications you’re taking, as some (like certain diuretics or calcium supplements) could affect results.

What the Results Mean

Results show your calcium and electrolyte levels compared to a standard range. Abnormal values may signal kidney problems, hormonal imbalances, or other health concerns that need further evaluation.

Common Conditions Linked to These Tests

High or low calcium can cause fatigue, bone pain, or heart issues. Sodium/potassium imbalances may lead to muscle weakness, irregular heartbeat, or seizures. Kidney problems often affect electrolyte levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Calcium & Electrolytes Panel

Frequently asked questions

Will I need to avoid certain foods or drinks before the test?
If fasting is required, avoid caffeine, alcohol, and large amounts of salt or dairy. Otherwise, eat your usual diet unless instructed otherwise.
Can I take my medications before the blood draw?
Yes, but check with your doctor or lab about timing—some medications (like calcium supplements) may need to be adjusted or skipped.
What if my results are outside the normal range?
Your doctor will discuss next steps based on your specific results, which may include additional tests, lifestyle changes, or treatment for underlying conditions.
  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