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Parathyroid Hormone (Intact)

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

This test measures the total amount of parathyroid hormone (PTH) in your blood, including the full-length active protein. PTH helps regulate calcium and phosphate levels in your body.

Quick summary

["PTH levels help diagnose and monitor conditions affecting calcium balance."]

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

Key facts at a glance

LOINC
48128-3
Short code
GH 1h p Arg+Ins SerPl-aCnc
Synonyms
GH 1h p Arg+Ins SerPl-aCnc
Category
hormone
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is This Test Done?

Your doctor may order this test if you have symptoms like bone pain, muscle weakness, or kidney stones, or if you have conditions such as hypoparathyroidism, hyperparathyroidism, or kidney disease. It may also be used to check for calcium imbalances or to monitor treatment for these issues.

What Does the Test Measure?

PTH is a hormone produced by your parathyroid glands. It plays a key role in maintaining calcium levels in your blood by affecting bone, kidneys, and intestines. The test measures the total PTH, including both active and inactive fragments.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed using an immunoassay method to detect PTH levels.

What Are Common Results?

Results are not provided with specific numeric ranges as they vary by lab and patient factors. Your doctor will interpret the results in relation to your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Intact PTH

Frequently asked questions

What Are Possible Causes of Abnormal Results?
Low PTH levels may be due to conditions like hypoparathyroidism, certain medications, or autoimmune diseases. High PTH levels can result from hyperparathyroidism, kidney disease, or vitamin D deficiency.
How Long Does It Take to Get Results?
Results are typically available within 1 to 3 business days, depending on your lab and healthcare provider.
Can I Eat or Drink Anything Before the Test?
You can usually eat and drink normally before this test unless your doctor instructs otherwise. No special preparation is typically required.
  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