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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. PTH is a hormone produced by your parathyroid glands that helps regulate calcium levels in your body.

Quick summary

["PTH helps control bone health and calcium balance; abnormal levels may indicate conditions like hypoparathyroidism or hyperparathyroidism."]

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

Key facts at a glance

LOINC
40306-3
Short code
GH 3h p Arg SerPl-mCnc
Synonyms
GH 3h p Arg SerPl-mCnc
Category
chemistry
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 Might Be Ordered

Your doctor may recommend this test if you have symptoms like bone pain, frequent muscle cramps, or unexplained high or low calcium levels. It’s also used to diagnose or monitor conditions such as kidney disease, osteoporosis, or hypercalcemia/hypocalcemia.

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 it’s part of a broader metabolic panel. Bring any medications you’re currently taking.

How the Test Works

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where it’s analyzed using an immunoassay method to measure intact PTH levels.

What the Results Mean

Results are interpreted by your doctor based on your symptoms, medical history, and other test results. Low PTH levels may suggest hypoparathyroidism, while high levels could indicate hyperparathyroidism or other conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Intact PTH

Frequently asked questions

What could cause abnormal results?
Abnormal PTH levels can occur due to thyroid disorders, kidney disease, vitamin D deficiency, or certain medications. Your doctor will consider these factors when reviewing your results.
How often should I get this test?
The frequency depends on your health condition. If you have a chronic condition like hyperparathyroidism, your doctor may order this test regularly to monitor your treatment.
Can I eat or drink before the test?
Typically, fasting is not required unless specified by your doctor. Always follow their instructions 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