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Parathyroid Hormone (Intact) - Serum

Published: August 9, 2026Updated: August 16, 2026

This test measures the total amount of parathyroid hormone (PTH) in your blood. PTH is a hormone produced by your parathyroid glands that helps regulate calcium and phosphorus levels in your body.

Quick summary

["PTH helps maintain healthy bone and nerve function by controlling calcium balance."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
23244-7
Short code
M avium paraTB Tiss Ql ZN Stn
Synonyms
M avium paraTB Tiss Ql ZN Stn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
acid-fast-stain-ziehl-neelsen
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test if you have symptoms of low or high calcium levels, such as muscle spasms, bone pain, or kidney problems. It may also be done to monitor conditions like hypoparathyroidism, hyperparathyroidism, or kidney disease.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or vein to draw blood. If you’re nervous, let your healthcare provider know so they can help make it more comfortable.

What the Test Results Mean

Results can help diagnose or monitor conditions related to calcium and PTH levels. Abnormal results may indicate issues with your parathyroid glands or other health problems.

Common Conditions Monitored

This test is often used to check for conditions like hypoparathyroidism (low PTH), hyperparathyroidism (high PTH), or kidney disorders that affect calcium metabolism.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: PTH plays a critical role in calcium homeostasis. Low levels may suggest hypoparathyroidism or vitamin D deficiency, while high levels could indicate hyperparathyroidism, kidney disease, or certain cancers. Regular monitoring helps manage these conditions effectively.

Short name

Intact PTH

Frequently asked questions

What causes abnormal PTH levels?
Abnormal PTH levels can result from thyroid disorders, kidney problems, vitamin D deficiency, or genetic conditions affecting PTH production. Lifestyle factors like diet (especially calcium intake) and medications can also influence results.
How long does it take to get test results?
Results are typically available within 1–3 business days, depending on your lab. Your doctor will discuss them with you during your follow-up visit.
Can diet affect PTH test results?
Yes, dietary calcium intake and vitamin D levels can influence PTH. Avoiding calcium-rich foods or supplements for 24 hours before testing may help ensure accurate results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy