What is Calcium?
Calcium is essential for bone and teeth structure, muscle contraction, heart function, nerve signalling, and blood clotting. About 99% of the body's calcium is stored in bones.
Serum calcium is partially bound to albumin. If albumin is low, the measured calcium will appear falsely low — a "corrected calcium" value is often calculated to account for this.
Why might Calcium be high?
Elevated blood calcium (hypercalcemia) is most commonly caused by overactive parathyroid glands or, less commonly, malignancy, excess vitamin D, or certain medications. Mild elevations may be asymptomatic.
This information is educational. A single out-of-range result is rarely the whole picture — a healthcare professional can interpret your numbers alongside your overall health and history.
Context questions that matter
- →Was this result slightly or clearly outside the reference range?
- →Were related markers also high or low?
- →Is this new compared with previous tests?
- →Could recent illness, exercise, fasting, alcohol, supplements, or medication affect it?
- →Do you have symptoms that should be discussed with a clinician?
Markers often reviewed together with Calcium
Clinicians rarely look at one number in isolation. These markers usually accompany Calcium on a electrolytes panel and help put the result in context.
Lifestyle considerations
- •Adequate vitamin D is essential for calcium absorption from the intestine
- •Weight-bearing exercise helps maintain bone calcium over time
Questions to ask your doctor
- →Could hydration, kidney function, medication, diuretics, vomiting, diarrhea or supplements affect this high Calcium result?
- →Are the other electrolytes on this panel also high or low?
- →Should this be rechecked alongside kidney markers and acid–base context if relevant?
Don't guess from one flagged result.
Start with the most relevant panel and see how your markers fit together in plain English.
Frequently asked questions
What does high Calcium mean?
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Elevated blood calcium (hypercalcemia) is most commonly caused by overactive parathyroid glands or, less commonly, malignancy, excess vitamin D, or certain medications. Mild elevations may be asymptomatic.
What is Calcium?
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Calcium is essential for bone and teeth structure, muscle contraction, heart function, nerve signalling, and blood clotting. About 99% of the body's calcium is stored in bones.
Can hydration or medication affect electrolytes?
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Yes. Hydration status, kidney function, diuretics, vomiting, diarrhea and certain supplements can all shift electrolyte results. A single value is read together with your fluid status and any recent illness.
Should electrolytes be compared with kidney markers?
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Often yes. Sodium, potassium, chloride, bicarbonate and calcium are usually read alongside creatinine and eGFR — the kidneys regulate electrolyte balance, so the two systems are interpreted together.
What supports healthy Calcium levels?
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Adequate vitamin D is essential for calcium absorption from the intestine. Weight-bearing exercise helps maintain bone calcium over time