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Human Parathyroid Hormone (Intact) - Blood

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

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

Quick summary

["Your blood calcium levels depend on intact PTH, which can be affected by conditions like hypoparathyroidism or hyperparathyroidism."]

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

Key facts at a glance

LOINC
50599-0
Short code
HPA-1 Bld
Synonyms
HPA-1 Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test to check for conditions affecting calcium metabolism, such as low or high calcium levels, kidney disease, or thyroid disorders. It’s also used to diagnose or monitor parathyroid gland issues, including tumors or overactivity.

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 recommends it. Wear comfortable clothing and plan to rest after the draw.

How the Test Works

A healthcare provider will draw blood from a vein in your arm. The sample is sent to a lab, where an immunoassay (or similar method) detects and quantifies intact PTH levels.

What the Results Mean

Results help determine if your PTH levels are too high or too low, which can indicate underlying health issues. Your doctor will interpret results in relation to your symptoms and other test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Intact PTH

Frequently asked questions

How long does it take to get my results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your doctor will contact you once they’re ready.
Can I eat or drink before this test?
If fasting is required (usually 8–12 hours), avoid food and liquids except water. Check with your doctor for specific instructions tailored to your situation.
What are common causes of abnormal PTH levels?
Abnormal PTH levels can result from thyroid disorders, kidney disease, vitamin D deficiency, or parathyroid tumors. Lifestyle factors like diet (low calcium or vitamin D) or medications may also play a role.
  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