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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 intact (whole) molecule, which is important for managing calcium levels and bone health.

Quick summary

["Your doctor may order this test to check if your thyroid glands are working properly or to diagnose conditions related to calcium imbalance."]

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

Key facts at a glance

LOINC
20893-4
Short code
M avium paraTB Stl Ql Cult
Synonyms
M avium paraTB Stl Ql Cult
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

Why This Test Is Done

A doctor may recommend intact PTH testing if you have symptoms like bone pain, frequent fractures, or unexplained muscle weakness. It’s also used to evaluate conditions such as hypoparathyroidism (low PTH), hyperparathyroidism (high PTH), or kidney disease that affects calcium metabolism.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if your doctor specifies it. Wear a comfortable shirt for easy access to your arm.

What Happens During the Test

A healthcare provider will insert a small needle into a vein in your arm to draw blood. You may feel a slight pinch, but it usually doesn’t cause pain. The process takes about 5 minutes.

What the Results Mean

Results help doctors determine if your PTH levels are too high or too low, which can affect calcium levels in your blood. Abnormal results may indicate conditions like kidney disease, vitamin D deficiency, or thyroid disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Intact PTH

Frequently asked questions

What causes false high or low results?
False results can occur if you have recent blood transfusions, are taking certain medications (like calcium supplements or antacids), or if your blood sample was improperly handled. Always follow your doctor’s instructions for test timing and preparation.
How long will I need to wait for results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your doctor will contact you to discuss the findings.
Can I eat or drink before the test?
If your doctor didn’t specify otherwise, you can eat normally, but avoid caffeine or heavy meals right before the blood draw to 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