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Parathyroid hormone (PTH) measured as active intact PTH

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

This test measures the active form of parathyroid hormone, a key regulator of calcium levels in your body.

Quick summary

["Your doctor may check this test to diagnose or monitor conditions affecting calcium balance."]

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

Key facts at a glance

LOINC
40308-9
Short code
GH 4h p Arg SerPl-mCnc
Synonyms
GH 4h 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 Is Done

Your doctor may order an intact PTH test to evaluate symptoms like bone pain, muscle weakness, or abnormal calcium levels. It’s also used to diagnose conditions such as hypoparathyroidism (low PTH) or hyperparathyroidism (high PTH) or to monitor treatment for these conditions.

What to Expect Before the Test

No special preparation is needed. You may have a blood sample drawn from a vein in your arm, similar to other blood tests. If you’re on medications that affect calcium or phosphorus, your doctor may advise timing your dose around the test.

What the Test Results Mean

Results are interpreted by your healthcare provider based on your overall health, symptoms, and lab values. Low PTH levels may suggest hypoparathyroidism, while high levels could indicate hyperparathyroidism or other conditions.

Common Conditions Monitored

This test helps diagnose or manage conditions like chronic kidney disease, vitamin D deficiency, or metabolic bone diseases. It’s also used in patients with unexplained calcium imbalances or symptoms of bone or muscle disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Intact PTH

Frequently asked questions

What causes abnormal PTH levels?
Abnormal PTH levels can result from thyroid disorders, kidney disease, vitamin D deficiency, or certain cancers. Symptoms like fatigue, bone pain, or frequent fractures may prompt testing.
How often should I get this test?
Your doctor will determine how often you need this test based on your health status, symptoms, and treatment plan. Regular monitoring may be needed if you have chronic conditions like kidney disease or hyperparathyroidism.
Can diet affect PTH test results?
Dietary calcium intake can influence calcium levels indirectly, but PTH itself is regulated by feedback mechanisms. Your doctor may advise limiting calcium supplements or certain foods if they suspect interference, but this is rare for standard PTH testing.
  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