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Parathyroid Hormone (Intact) - Serum

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

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

Quick summary

["Your blood calcium levels depend on intact PTH levels—keep them balanced for strong bones and nerves."]

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

Key facts at a glance

LOINC
79204-4
Short code
GH 1.25h p Arg+Ins SerPl-mCnc
Synonyms
GH 1.25h 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 Matters

Your doctor may order this test if you have symptoms like bone pain, frequent fractures, or unexplained high or low calcium levels. 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, but avoid calcium supplements or certain foods (like dairy) for 24 hours before your blood draw if instructed by your provider.

What the Results Mean

Results help determine if your PTH levels are too high or too low, which can affect calcium balance and bone health. Your doctor will compare your results to your medical history and other tests.

Common Conditions Linked to PTH Levels

High PTH levels may indicate overactive parathyroid glands (hyperparathyroidism), while low levels could suggest underactive glands (hypoparathyroidism) or other disorders like vitamin D deficiency.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Parathyroid hormone (PTH) is a critical hormone for maintaining calcium and phosphate levels in your blood. When levels are abnormal, it can lead to bone weakness, kidney stones, or nerve/muscle problems. This test helps diagnose and guide treatment for conditions affecting these systems.

Short name

Intact PTH

Frequently asked questions

What causes abnormal PTH levels?
Abnormal PTH levels can result from thyroid or parathyroid gland disorders, kidney disease, vitamin D deficiency, or certain medications. Symptoms like bone pain, fatigue, or frequent fractures may also prompt testing.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab and insurance. Follow up with your doctor to discuss the findings.
Can diet affect PTH test results?
Yes—avoid high-calcium foods (like dairy) and supplements for 24 hours before testing to get an accurate reading. Your doctor may give specific instructions.
  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