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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, including all active forms. PTH helps regulate calcium and phosphate levels in your body.

Quick summary

["Your blood calcium levels depend on intact PTH levels—low or high can signal health concerns."]

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

Key facts at a glance

LOINC
79200-2
Short code
GH 2.5h p Arg+Ins SerPl-mCnc
Synonyms
GH 2.5h p Arg+Ins SerPl-mCnc
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 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 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 on blood thinners, let your doctor know before the test.

What the Results Mean

Results help determine whether your calcium levels are balanced. Very high or low levels can indicate hormonal imbalances or other health issues that need medical attention.

Common Conditions Affecting Results

Conditions like kidney disease, vitamin D deficiency, or thyroid disorders can influence PTH levels. Your doctor will review your full medical history and other test results to interpret the results accurately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Parathyroid hormone (PTH) is crucial for maintaining calcium and phosphate balance in your body. Low levels may cause muscle spasms, cramps, or abnormal heart rhythms, while high levels can lead to weak bones, kidney stones, or heart problems. This test helps diagnose and manage conditions tied to PTH imbalances.

Short name

Intact PTH

Frequently asked questions

What does an abnormal result mean?
An abnormal result may signal an overactive or underactive parathyroid gland, kidney issues, or other hormonal imbalances. Your doctor will discuss your specific findings and next steps, such as further testing or treatment.
How often should I get this test?
Frequency depends on your health condition. If you have a known disorder (like hyperparathyroidism), your doctor may order this test regularly. Otherwise, it’s often done only when symptoms or other test results suggest it’s needed.
Can diet or supplements affect this test?
Yes, calcium-rich foods, vitamin D supplements, or certain medications (like calcium supplements or antacids) can influence PTH levels. Avoid taking these 24 hours before your test unless instructed otherwise.
  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