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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 doctor may order this test to check for conditions affecting calcium balance or bone health."]

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

Key facts at a glance

LOINC
15483-1
Short code
M avium paraTB Ab Ser Ql IA
Synonyms
M avium paraTB Ab Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 Is Done

Your doctor may recommend this test if you have symptoms like bone pain, frequent fractures, or unexplained muscle weakness. It’s also used to monitor conditions like hypoparathyroidism, hyperparathyroidism, or kidney disease that can affect calcium levels.

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 doctor specifies it. Bring any medications you’re currently taking, as some can affect PTH levels.

How the Test Is Performed

A healthcare provider will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but the procedure is quick and usually painless. The blood sample is sent to a lab for analysis.

What the Results Mean

Results are interpreted by your doctor based on your symptoms, medical history, and other test results. Abnormal levels may indicate imbalances in calcium or phosphate, which can lead to health issues like bone disease or kidney problems.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Intact PTH

Frequently asked questions

How often will I need this test?
Your doctor will determine how often you need this test based on your health condition. Some people may need it yearly, while others may need it more or less frequently depending on their treatment plan.
Can I eat or drink before the test?
If fasting is required, follow your doctor’s instructions carefully. If no fasting is needed, you can eat and drink normally, but avoid caffeine or large amounts of dairy before the test if advised.
What are the possible side effects of the blood draw?
Most people experience only minor discomfort or bruising at the site. Rarely, there may be a slight swelling or redness, but these usually go away quickly. If you experience excessive bleeding or pain, contact your doctor.
  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