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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, which helps regulate calcium levels in your body.

Quick summary

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

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

Key facts at a glance

LOINC
94621-0
Short code
M avium paraTB Ab/Pos cntrl Spec IA
Synonyms
M avium paraTB Ab/Pos cntrl Spec 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 healthcare provider may order this test if you have symptoms like bone pain, frequent fractures, or unexplained high or low calcium levels in your blood. It might also be used to check for conditions such as hyperparathyroidism (too much PTH) or hypoparathyroidism (too little PTH).

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you’re on blood thinners or have a history of bleeding issues, let your provider know.

What the Test Results Mean

Results are interpreted by your healthcare provider based on your overall health and symptoms. High PTH levels may suggest overactive parathyroid glands, while low levels could indicate problems like vitamin D deficiency or other hormonal imbalances.

Common Conditions Monitored

This test is often used to monitor conditions like chronic kidney disease, osteoporosis, or after surgery to remove overactive parathyroid glands.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Parathyroid Hormone’s Role

Short name

Intact PTH

Frequently asked questions

What does a high or low PTH level indicate?
High PTH levels may signal hyperparathyroidism, where your body produces too much PTH, leading to elevated calcium that can weaken bones or cause kidney stones. Low PTH levels can result from conditions like hypoparathyroidism, where calcium levels drop, potentially causing muscle spasms or cramps.
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 are at risk for bone disorders.
Can diet or supplements affect PTH levels?
Yes, calcium and vitamin D intake can influence PTH levels. Excessive calcium intake or vitamin D supplements may lower PTH, while deficiencies can raise it. Always follow your doctor’s advice regarding supplements.
  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