To book, call 8872524007.
What the Calcium test checks
Standard "serum calcium" is total calcium. About half of it is bound to proteins, mainly albumin. The other half is free (ionised) calcium, the active form.
That matters for reading the result. If albumin is low, as in liver disease, kidney protein loss or poor nutrition, total calcium reads low even when the active part is fine. Doctors then use a "corrected calcium" worked out from your albumin, or ask for ionised calcium directly.
Blood calcium is controlled by parathyroid hormone, vitamin D and the kidneys, working together with phosphorus.
Why your doctor may order it
- Muscle cramps, tingling around the mouth or fingers, or twitching
- Bone pain, weak bones or a fracture after a minor fall
- Tiredness, constipation, thirst and frequent urination (possible signs of high calcium)
- Kidney stones
- Kidney disease, where calcium and phosphorus are followed together
- After thyroid or parathyroid surgery
- Checking low vitamin D or monitoring supplements
How to prepare
Fasting isn't usually needed, though some doctors prefer a morning sample. If you take calcium or vitamin D tablets, ask your doctor whether to take the dose before the test; don't stop them on your own.
During the draw, the tourniquet should be on only briefly. A tight band left too long, or a lot of fist pumping, can raise calcium slightly.
Sample type and report time
A serum sample is drawn into a red or yellow tube. We usually report the same day when collected by about 11 am, as a printed copy and a WhatsApp PDF.
If you're looking for a calcium test near me for an older parent with weak bones, we can collect at home; see home sample collection.
Understanding your results
Typical adult total calcium is roughly 8.5 to 10.5 mg/dL. A widely used correction adds 0.8 mg/dL for every 1 g/dL that albumin falls below 4.0.
Low calcium can be associated with vitamin D deficiency, low albumin, chronic kidney disease, low magnesium and underactive parathyroid glands. High calcium is most often linked to an overactive parathyroid gland; other causes include some cancers, too much vitamin D and dehydration. A PTH test usually comes next if calcium is high.
Kidney markers such as serum creatinine are often read alongside, and the blood urea test helps judge hydration. The range printed on your report is the one that applies, ranges vary by lab and method, and your doctor reads the result alongside your symptoms and other tests.
FAQ
Does a normal calcium test mean my bones are strong?
No. Blood calcium stays normal even when bones are thinning, because the body pulls calcium out of bone to keep blood levels steady. Bone density needs a scan.
What is corrected calcium?
It's total calcium adjusted for a low albumin level, to estimate what the calcium would be if albumin were normal.
Should I stop calcium tablets before the test?
Don't stop anything without asking your doctor. They'll tell you whether to skip the morning dose.
Is ionised calcium the same test?
No. Ionised calcium measures only the free, active form and needs special handling. Ask us if your doctor has written it.
Book at Alpha Laboratory
Call 8872524007 to book a calcium test, or WhatsApp us. Directions are on the contact page.