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Test Details

PTH Intact Molecule Test 1500

A parathyroid hormone (PTH) blood test measures the level of parathyroid hormone in your blood.

Specimen Type

:  Blood

Pre-test Information

:  No Special Preparation Required.

Report Delivery

:  24 Hours


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What is PTH Intact Molecule Test?

A parathyroid hormone (PTH) blood test measures the level of parathyroid hormone in your blood.


Why take PTH Intact Molecule Test?

To determine the source for calcium level disturbance and imbalance; to guage parathyroid function; to diagnose and differentiate between primary, secondary, and tertiary hyperparathyroidism; to diagnose hypoparathyroidism; during surgery for hyperparathyroidism to verify removal of the gland(s) causing the concern.


Is this test for you?

Your body needs to have adequate levels of calcium to be able to function properly. Your physician might suggest you do the PTH test when:

  • You show symptoms of high calcium in blood like weakness, nausea, frequent thirst and pain in the abdomen
  • You show symptoms of low calcium like tingling of fingers, muscle cramps.


More about PTH Intact Molecule Test

Calcium is vitally important for carrying out various body functions and maintaining a normal calcium level in blood is highly important, however, several chemicals in our body influence the calcium levels in the blood. Parathyroid hormone (PTH) helps regulation of calcium in the body and maintains high calcium levels in the blood, so that blood calcium remains normal. It is part of a collective system of several chemicals such as calcium, PTH, vitamin D, and, to some extent, phosphorus (phosphate) and magnesium that work together to regulate calcium levels in blood- known as a feedback loop. Conditions and diseases that cause interruption in normal working of this feedback loop can cause inappropriate elevations or decreases in calcium and PTH levels and lead to symptoms of hypercalcemia (high calcium in blood) or hypocalcemia (low calcium levels in blood), respectively. This test measures the amount of PTH in the blood.

Reference Values

Normal values are 10 to 55 pg/mL


If both PTH and calcium levels are normal, then there are chances that the body's calcium regulatory system is working well.
PTH is produced so that it can secrete more calcium in blood if it senses low calcium levels. Low levels of PTH may be due to conditions causing excess calcium to remain in the blood, because of which the body doesn’t find the need to produce enough PTH, or it’s due to an abnormality in PTH production causing hypoparathyroidism.