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Parathyroid Hormone (Intact)

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

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

Quick summary

["PTH helps control your body’s calcium balance and affects bones, kidneys, and the intestines."]

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

Key facts at a glance

LOINC
20894-2
Short code
M avium paraTB Ab Ser Ql CF
Synonyms
M avium paraTB Ab Ser Ql CF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
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 Might Be Ordered

Your doctor may recommend this test if you have symptoms like bone pain, frequent fractures, muscle weakness, or unexplained kidney stones. It’s also used to diagnose or monitor conditions such as hypoparathyroidism, hyperparathyroidism, or kidney disease.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Wear comfortable clothing and bring any medications you’re currently taking.

How the Test Works

A small sample of your blood is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed to measure the intact PTH levels.

Possible Results and Next Steps

Results are compared to a reference range specific to your age, sex, and overall health. If results are outside the normal range, your doctor may recommend further testing or adjustments to your treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Intact PTH

Frequently asked questions

High PTH levels may indicate hyperparathyroidism, where your body produces too much PTH, leading to calcium imbalances and potential complications like kidney stones or weakened bones. Low PTH levels may suggest hypoparathyroidism, causing muscle cramps, numbness, or irregular heart rhythms.
This test helps diagnose and manage conditions related to calcium metabolism and PTH regulation, ensuring proper treatment to prevent long-term health issues.
What does an abnormal PTH result mean?
An abnormal result could signal an overactive or underactive thyroid gland, kidney problems, or other metabolic disorders. Your doctor will discuss findings with you and may order additional tests to determine the cause.
How often should I get this test?
Frequency depends on your health condition. If you have a known disorder like hyperparathyroidism, your doctor may schedule regular follow-ups to monitor levels and adjust treatment as needed.
  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