Understanding Parathyroid Hormone: Normal vs Optimal Ranges

?What is Parathyroid Hormone?

Parathyroid hormone (PTH) is a hormone produced by the parathyroid glands that regulates calcium and phosphate levels in the blood. PTH increases blood calcium by stimulating calcium reabsorption in the kidneys, activating vitamin D, and promoting calcium release from bone. Abnormal PTH levels may suggest underlying disorders in calcium regulation or parathyroid function.

!Why It Matters

PTH is essential for maintaining calcium homeostasis, which is critical for bone health, muscle function, and nerve signalling. Elevated PTH may suggest primary hyperparathyroidism or secondary hyperparathyroidism due to vitamin D deficiency or kidney disease, while low PTH can be associated with hypoparathyroidism or hypercalcaemia. Chronic PTH imbalance could indicate increased risk of osteoporosis, kidney stones, or metabolic bone disease.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Bone pain or weakness
• Muscle weakness or cramps
• Fatigue and cognitive difficulties
• Kidney stones
• Osteoporosis or frequent fractures

How to Improve Your Levels

• 1Optimise vitamin D intake and levels through sun exposure or supplementation
• 2Ensure adequate dietary calcium from dairy, leafy greens, or fortified foods
• 3Maintain adequate magnesium intake, which supports PTH regulation
• 4Limit phosphate-rich processed foods that can disrupt calcium-phosphate balance
• 5Monitor kidney function, as kidney disease impairs PTH regulation
• 6Consult an endocrinologist if PTH remains persistently abnormal

When to Test

PTH testing is recommended when investigating abnormal calcium levels, suspected bone disease, chronic kidney disease, vitamin D deficiency, or recurrent kidney stones. It is also valuable for monitoring patients with known parathyroid disorders or osteoporosis.

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