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Calcium is one of the most common minerals in the body. In your blood, calcium exists in two forms: ionized (free) and bound (attached to proteins like albumin). The Serum Calcium measures total calcium, which includes both types.The Serum Calcium test is usually done if you have:Muscle cramps or spasmsTingling in your hands or feetFatigue or weaknessBone painIrregular heartbeatConfusionPerioral numbnessTetanySeizuresCalcium blood test also helps diagnose and monitor calcium metabolism problems, parathyroid or kidney diseases, bone disorders, and how treatments are working in very ill patients.Low calcium levels are called hypocalcemia. This can happen due to:Vitamin D deficiencyKidney problemsLow parathyroid hormoneHypoparathyroidism (post-thyroid/parathyroid surgery, autoimmune)Chronic kidney disease (CKD)Acute pancreatitisSepsis & critical illnessHypoalbuminemia (pseudo-hypocalcemia)Magnesium deficiencyMedications: bisphosphonates, calcitonin, phenytoinHigh calcium levels are called hypercalcemia. This can occur because of:Overactive parathyroid glandsCertain cancersKidney diseaseToo much calcium intakePrimary hyperparathyroidismMalignancy (lytic bone lesions, myeloma)Excess Vitamin D or calcium intakeSarcoidosis / granulomatous disordersThiazide diureticsImmobilizationThyrotoxicosisAn overnight fast (8-12 hours) is preferred but not mandatory for serum calcium test preparation. Always tell your doctor about any medicines or supplements you take, as these can affect calcium levels.Test results can vary slightly between labs. Talk to your doctor to understand your test results. Your doctor will suggest the best treatment or lifestyle changes based on your test results.
Yes. To ensure accurate results, follow these key requirements before taking a Calcium test.
Maintain normal hydration before the test.
A blood sample is collected from a vein in the arm by a trained healthcare professional.
Fasting is usually not required, but sometimes 6–8 hours fasting may be recommended depending on other tests.
Inform the healthcare provider if you have kidney disease, bone disorders, thyroid or parathyroid problems, as these can influence calcium levels.
Inform your doctor about calcium supplements, vitamin D supplements, or other medications, as they may affect calcium levels.
Overnight fasting is preferred but not mandatory.
The contents of this website are for informational purposes only and not intended to be a substitute for professional medical advice, diagnosis, or treatment. Please seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition. Do not disregard professional medical advice or delay in seeking it because of something you have read on this website.
