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Parathyroid Hormone (PTH) Levels

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

This test measures the amount of parathyroid hormone (PTH) in your blood, a key protein that helps regulate calcium levels in your body.

Quick summary

["PTH helps balance calcium and phosphorus, affecting bone health and nerve function."]

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

Key facts at a glance

LOINC
36053-7
Short code
MR Parathyroid gland
Synonyms
MR Parathyroid gland
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr
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 a PTH test if you have symptoms like bone pain, muscle weakness, frequent urination, or unexplained kidney stones. It’s also used to diagnose or monitor conditions such as hypoparathyroidism (low PTH) or hyperparathyroidism (high PTH).

What to Expect Before the Test

No special preparation is needed for this blood test. You may be asked to fast for 8–12 hours before the draw, but this depends on your doctor’s instructions. Bring any medications you’re currently taking to your appointment.

What Happens During the Test

A healthcare provider will draw blood from a vein in your arm. The process takes a few minutes, and you may feel a slight pinch. The blood sample is sent to a lab for analysis.

What the Results Mean

Results help doctors determine if your calcium and bone health are balanced. Very high or very low PTH levels may indicate underlying conditions that need treatment or further testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

PTH is crucial for maintaining calcium homeostasis. Abnormal levels can lead to complications like osteoporosis, kidney stones, or neurological issues. Your doctor will interpret results in the context of your symptoms and medical history.

Short name

PTH

Frequently asked questions

What causes PTH levels to be tested?
PTH levels are tested if you have symptoms like bone pain, muscle weakness, or frequent kidney stones, or if your doctor suspects an imbalance in calcium or parathyroid gland function.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time.
Can I eat or drink before this test?
Check with your doctor first, as fasting may be required for some patients, but generally, you can eat and drink normally 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