Serum Calcium (Total) Test in Kolkata | Home Collection & NABL-Certified Results

Apollo Diagnostics | NABL-Certified Lab | Home Collection Available | Digital Reports on WhatsApp

What is a Serum Calcium (Total) Test?

The Serum Calcium (Total) test measures the total amount of calcium circulating in your blood. Calcium is one of the most important minerals in the body — while approximately 99% is stored in bones and teeth, a small but tightly regulated amount circulates in the blood performing critical functions. A Serum Calcium test is essential for monitoring bone health, blood clotting, nerve conduction and the proper function of the heart and muscles. Because blood calcium is strictly controlled by the parathyroid glands, kidneys and Vitamin D, an abnormal result is often the first indicator of underlying hormonal, kidney or metabolic issues.

⚠ Important: While fasting is not strictly mandatory for a standalone Serum Calcium test, fasting for 8–10 hours is recommended when it is part of a larger metabolic panel. Inform your phlebotomist if you are taking Vitamin D supplements, calcium tablets, thiazide diuretics, lithium or antacids as these can all affect calcium levels. The sample should be transported promptly to avoid haemolysis which can falsely elevate calcium.

Why Monitor Your Calcium Levels?

Calcium levels that are too high (hypercalcaemia) or too low (hypocalcaemia) can cause serious health problems:

• Evaluate Bone Health — screens for osteoporosis, osteomalacia and conditions causing bone calcium loss
• Check Parathyroid Function — the parathyroid glands are the primary regulators of calcium; abnormal calcium levels often indicate parathyroid disease
• Monitor Kidney Function — kidneys filter and reabsorb calcium; kidney disease and kidney stones are closely linked to calcium imbalance
• Investigate Symptoms — muscle cramps, tingling in fingers, fatigue, bone pain, abdominal pain or confusion may all indicate calcium imbalance
• Cancer Screening — hypercalcaemia is a common complication of certain cancers (multiple myeloma, lung, breast, kidney cancer)

Normal Serum Calcium Reference Range

Category	Normal Total Calcium Range
Adults	8.5 – 10.5 mg/dL (2.12 – 2.62 mmol/L)
Children	8.8 – 10.8 mg/dL
Neonates	7.6 – 10.4 mg/dL
Hypocalcaemia	Below 8.5 mg/dL
Hypercalcaemia	Above 10.5 mg/dL
Severe Hypercalcaemia	Above 12.0 mg/dL (requires urgent treatment)

Total Calcium includes protein-bound calcium (mainly albumin-bound) and free ionised calcium. If albumin is low (as in liver disease or malnutrition), the corrected calcium should be calculated by your doctor.

Corrected Calcium — Why It Matters

Why albumin level affects calcium interpretation:

• About 40–45% of circulating calcium is bound to albumin. Total Calcium includes this bound fraction.
• If albumin is low (hypoalbuminaemia — common in liver disease, malnutrition and kidney disease), Total Calcium will be falsely low even if the physiologically active ionised calcium is normal.
• Corrected Calcium formula: Corrected Calcium (mg/dL) = Measured Total Calcium + 0.8 × (4.0 – Patient's Albumin in g/dL)
• Your doctor will calculate corrected calcium whenever albumin is below 4.0 g/dL.
• Ionised Calcium (free calcium) can also be measured directly — it is the biologically active fraction and is more accurate when albumin is abnormal.

Causes of High Calcium (Hypercalcaemia)

• Primary Hyperparathyroidism — overactive parathyroid gland secreting excess PTH. The most common cause of hypercalcaemia in outpatients.
• Malignancy (Cancer) — bone metastases from breast, lung or kidney cancer; multiple myeloma; lymphoma. Second most common cause.
• Vitamin D toxicity — excessive supplementation causing increased intestinal calcium absorption
• Sarcoidosis and granulomatous diseases — produce active Vitamin D causing excess calcium absorption
• Thiazide diuretics — reduce renal calcium excretion
• Prolonged immobilisation — bone calcium released into blood
• Milk-alkali syndrome — excessive calcium and antacid intake

Causes of Low Calcium (Hypocalcaemia)

• Vitamin D deficiency — most common cause in India; reduces intestinal calcium absorption
• Hypoparathyroidism — underactive parathyroid gland (often post-thyroid surgery)
• Chronic Kidney Disease (CKD) — impaired Vitamin D activation and increased phosphate retention
• Hypoalbuminaemia — low albumin causing falsely low Total Calcium (corrected calcium may be normal)
• Magnesium deficiency — impairs PTH secretion and action
• Acute pancreatitis — calcium deposits in inflamed pancreatic tissue
• Malabsorption syndromes — Celiac disease, Crohn's disease reducing calcium absorption

Serum Calcium Test Price in Kolkata

Serum Calcium (Total) Test Price: ₹210
Fasting recommended if part of a panel  |  Inform of supplements & medications  |  Free home collection above ₹2,000

Tests Commonly Ordered Alongside Serum Calcium

• Serum Phosphorus — calcium and phosphorus have an inverse relationship; together they assess parathyroid function and kidney disease
• Vitamin D (25-OH) — Vitamin D deficiency is the most common cause of low calcium in India
• PTH (Parathyroid Hormone) — directly assesses parathyroid gland function when calcium is abnormal
• Albumin — required to calculate corrected calcium when albumin is low
• Kidney Function Test (KFT) — kidney disease disrupts calcium and phosphorus balance
• Magnesium — magnesium deficiency impairs PTH release and can cause hypocalcaemia
• CBC — multiple myeloma causing hypercalcaemia shows abnormal protein and anaemia on CBC

Home Collection for Serum Calcium Test in Kolkata

Apollo Diagnostics provides home blood sample collection for Serum Calcium tests across North and Central Kolkata. Our phlebotomists arrive at your doorstep with sterile single-use equipment. Samples are transported promptly to avoid haemolysis and processed at our NABL-certified central laboratory with same-day results.

• Home collection available: 7:00 AM – 2:30 PM Daily
• Fast 8–10 hours if included in a larger panel
• Inform phlebotomist of Vitamin D supplements and medications
• Free home collection on orders above ₹2,000
• Digital reports delivered to WhatsApp within 24 hours

📞 Book Serum Calcium Test via WhatsApp — +91 8660434628

Quick Links

→ Apollo Diagnostics Nagerbazar → Full List of Individual Tests → Book Home Collection → Full Body Checkup Packages

Frequently Asked Questions

Q1. What is the Serum Calcium test used for?

The Serum Calcium test measures total blood calcium to assess bone health, parathyroid function, kidney function and Vitamin D status. It investigates symptoms like muscle cramps, tingling, bone pain and fatigue, and screens for hypercalcaemia caused by cancer or hyperparathyroidism and hypocalcaemia caused by Vitamin D deficiency or kidney disease.

Q2. What is the normal Serum Calcium level?

Normal Total Serum Calcium in adults is 8.5–10.5 mg/dL. Below 8.5 mg/dL is hypocalcaemia. Above 10.5 mg/dL is hypercalcaemia. Levels above 12.0 mg/dL are severe hypercalcaemia requiring urgent medical evaluation. Always interpret alongside albumin level as low albumin can cause falsely low Total Calcium.

Q3. Does the Serum Calcium test require fasting?

Fasting is not strictly required for a standalone Serum Calcium test. However fasting for 8–10 hours is recommended when calcium is ordered as part of a larger metabolic panel. Inform your phlebotomist of Vitamin D supplements, calcium tablets, thiazide diuretics and antacids as these can affect results.

Q4. What is the Serum Calcium test price at Apollo Diagnostics Kolkata?

The Serum Calcium (Total) test price at Apollo Diagnostics is ₹210. Home collection is available free on orders above ₹2,000.

Q5. What are the symptoms of low calcium (hypocalcaemia)?

Symptoms of low calcium include muscle cramps and spasms (especially in the hands and feet), tingling or numbness around the mouth and in the fingers and toes (tetany), fatigue, anxiety and depression, dry skin and brittle nails, and in severe cases seizures and abnormal heart rhythms. In children severe hypocalcaemia from Vitamin D deficiency causes rickets with soft bending bones and delayed tooth eruption.

Q6. What are the symptoms of high calcium (hypercalcaemia)?

Mild hypercalcaemia is often asymptomatic and discovered incidentally. Moderate to severe hypercalcaemia causes symptoms remembered by the mnemonic "Bones, Stones, Groans and Psychic Moans" — bone pain and fractures, kidney stones and increased urination, abdominal pain, nausea and constipation, and fatigue, confusion, depression or cognitive impairment. Very high calcium above 14 mg/dL is a medical emergency.

Q7. Why is Vitamin D important for calcium levels?

Vitamin D is essential for calcium absorption from the intestine. Without adequate Vitamin D the intestine absorbs only 10–15% of dietary calcium instead of the normal 30–40%. This triggers the parathyroid glands to produce more PTH which extracts calcium from bones to maintain blood levels — leading to bone weakening (osteomalacia in adults, rickets in children). Vitamin D deficiency is the most common cause of low calcium in India and both should always be tested together.

Q8. Is home collection available for Serum Calcium test in Kolkata?

Yes. Apollo Diagnostics provides home blood sample collection for Serum Calcium tests across Dum Dum, South Dum Dum, Nagerbazar, Satgachi, Baguiati, Lake Town, Bangur, Kaikhali, Sealdah, Entally, Phoolbagan, Tangra and surrounding areas. Book by calling or WhatsApping +91 8660434628.

Q9. How long does it take to get Serum Calcium test results?

Serum Calcium test results are typically available within 24 hours of sample collection. Reports are delivered digitally to your WhatsApp or email.

Q10. Which centre processes my Serum Calcium sample in Kolkata?

All samples collected across North and Central Kolkata are processed at Apollo Diagnostics Nagerbazar — Nandarani Apartment, 8A Narasingha Avenue, Nagerbazar, Dum Dum, Kolkata 700074. Our lab is NABL-certified and ISO-certified.