Quick Facts
- Sample: Blood
- Fasting: Fasting for at least 12-14 hours prior to collection is required. Stop biotin consumption at least 72 hours prior to collection.
- Turnaround: 2-4 days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
This test measures two biomarkers in your blood: intact parathyroid hormone (PTH) and calcium. PTH is produced by the parathyroid glands and helps regulate how much calcium is in your blood and bones, while also influencing phosphorus and vitamin D balance. Calcium is measured directly as the total amount circulating in your blood at the time of collection.
Together, these two values give you a picture of how your parathyroid glands and blood calcium levels relate to one another. Reporting PTH and calcium side by side allows a healthcare provider to see how these two related values compare, without combining them into a single calculated result.
Benefits
- Measures both PTH and calcium levels from one blood draw.
- Supports evaluation of abnormal calcium levels in the blood.
- Helps assess parathyroid gland function over time.
- Useful for monitoring certain kidney and parathyroid conditions.
- Can help confirm outcomes after parathyroid gland surgery.
Who Is This Test For?
- People with symptoms linked to high blood calcium, such as fatigue or bone pain.
- People with symptoms linked to low blood calcium, such as muscle cramps or tingling.
- Individuals being monitored for kidney disease affecting calcium balance.
- Individuals being monitored for hyperparathyroidism or hypoparathyroidism.
- Individuals confirming results after removal of an overactive parathyroid gland.
- Anyone asked by a healthcare provider to check PTH and calcium together.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this test?
This test measures intact parathyroid hormone (PTH) and calcium in the blood. These results may help a healthcare provider evaluate how your parathyroid glands are functioning and how that relates to your blood calcium levels. The test does not diagnose a condition on its own and is intended to be reviewed alongside other clinical information.
2. Who would benefit from this test?
People experiencing symptoms associated with abnormal blood calcium, such as increased thirst, muscle weakness, or digestive upset, may benefit from this test. It may also be useful for individuals being monitored for kidney disease, hyperparathyroidism, or hypoparathyroidism, or those confirming results after parathyroid gland removal. A healthcare provider can help determine if this test is appropriate for your situation.
3. When should I order this test?
You may consider ordering this test if you are experiencing symptoms linked to high or low blood calcium, such as bone pain, muscle cramps, or changes in mental clarity. It may also be appropriate for ongoing monitoring of parathyroid or kidney related conditions, or for follow up after parathyroid gland treatment. This test does not replace a full medical evaluation.
4. What does this test measure?
This test reports two directly measured values from a blood sample: intact PTH and calcium. Both results are quantitative concentrations rather than calculated or qualitative values. The two biomarkers are reported individually, so this test reflects both parathyroid hormone activity and current blood calcium levels rather than a single combined score.
5. Do I need to fast before this test?
Yes. Fasting for at least 12-14 hours prior to collection is required. You should also stop biotin consumption at least 72 hours prior to the collection.
6. How quickly will I get results?
Results are typically available in 2-4 days. Results may take longer based on weather, holiday, or lab delays.
7. How do I interpret the results?
Interpreting PTH and calcium results depends on the specific values reported, your symptoms, medical history, medications, and other laboratory findings. An abnormal PTH or calcium level does not automatically confirm a specific condition, and a normal result does not rule one out. Because PTH and calcium influence one another, both values are typically reviewed together rather than separately. Discuss your results with a qualified healthcare provider for a full interpretation.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
8. What should I do if my results are abnormal?
If your PTH or calcium results fall outside the expected range, review them with a qualified healthcare provider. They can help determine what the results may mean in the context of your overall health and whether additional evaluation or testing is needed. Do not stop prescribed medication unless instructed by your healthcare provider.
9. How often should I get tested?
There is no set schedule for retesting PTH and calcium levels. How often you should be tested depends on your individual health situation and should be determined as directed by your healthcare provider, especially if you are being monitored for an ongoing condition.
Pre test preparation
Fasting for at least 12-14 hours prior to collection is required. Patients should stop biotin consumption at least 72 hours prior to the collection.
Do not stop prescribed medication unless instructed by your healthcare provider.
