Description
Why It’s Done
1. To Evaluate Calcium Imbalance
• Hypercalcemia (high calcium levels)
• Hypocalcemia (low calcium levels)
These imbalances can be related to:
• Parathyroid gland disorders
• Kidney disease
• Vitamin D deficiency or excess
• Certain cancers
• Bone diseases
2. To Monitor Specific Conditions
• Chronic kidney disease
• Liver disease
• Pancreatitis
• After major surgeries or transfusions
3. To Assess Function of Organs and Systems
• Parathyroid hormone (PTH) activity
• Bone health
• Neuromuscular function
4. To Monitor Therapy
• Calcium or vitamin D supplements
• Dialysis
• Treatment for calcium-related disorders
Preparation
1. General Guidelines
• Fasting: May be required (usually 8–12 hours) if the test is done along with other blood tests.
• Medication: Inform your doctor about any medications or supplements you are taking, especially:
o Calcium supplements
o Vitamin D
o Diuretics
o Antacids
o Lithium
o Bisphosphonates
Do not stop any medication unless advised by your healthcare provider.
2. Avoid Certain Factors
• Avoid vigorous exercise before the test as it may temporarily increase calcium levels.
• Avoid a high-calcium meal or supplement within 12 hours if instructed by your doctor.
3. Sample Collection
• A blood sample is drawn from a vein in your arm.
• For ionized calcium, the sample must be handled quickly and properly to avoid false readings (pH and temperature affect ionized calcium levels).
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