Parathyroid adenoma

The parathyroid glands are four rice-sized glands behind the thyroid that produce parathyroid hormone (PTH), which helps regulate calcium levels in the body. A parathyroid adenoma is a benign growth in one of these glands that causes excess PTH production, even when calcium levels are already high. This leads to primary hyperparathyroidism, a condition that can affect bone strength, kidney health, and calcium balance throughout the body.

Doctors group this condition into two main categories based on how it presents. Primary hyperparathyroidism may be discovered in people with clear symptoms or through routine blood testing in people with few or no specific symptoms. When symptoms are present, they can include kidney stones, bone loss or fractures, increased thirst and urination, abdominal or gastrointestinal symptoms, and muscle weakness.

Many people have no obvious symptoms when the condition is first identified. However, they may still have measurable effects on bone or kidney health, which is why further assessment is important after the biochemical diagnosis.

Parathyroid adenoma symptoms are often subtle and non-specific, making the condition easy to miss without blood testing. Common signs include:

• Persistent fatigue and low energy, one of the most common and frequently overlooked symptoms

• Low mood, anxiety, depression, or mild cognitive impairment from hypercalcaemia affecting brain function

• Bone pain or tenderness, particularly in the spine, hips, and long bones from calcium being mobilised out of bone

• Kidney stones, from excess calcium being excreted in the urine and crystallising in the renal collecting system

• Frequent urination and increased thirst from hypercalcaemia impairing renal concentrating ability

• Nausea, constipation, and reduced appetite from hypercalcaemia affecting gastrointestinal motility

• Muscle weakness and aching, particularly in the proximal limbs

• Hypertension, independently associated with primary hyperparathyroidism

• In severe or prolonged disease: fragility fractures from significant bone density loss, and nephrocalcinosis from calcium deposition in kidney tissue

A parathyroid adenoma develops from the clonal expansion of a single abnormal parathyroid cell that has lost its normal calcium-sensing regulation. Contributing factors include:

• Acquired genetic changes: changes within a single parathyroid cell can contribute to adenoma formation.

• Past radiation exposure: getting radiation treatments to your head, neck, or chest in the past increases your risk of developing these tumors years later.

• Family genes: rare, inherited genetic conditions (like MEN1) can cause multiple parathyroid glands to grow tumors, often alongside growths in other parts of the body.

• Age and gender: these tumors are most common in women who have gone through menopause, likely due to how changing hormone levels interact with your body’s calcium controls.

Parathyroid adenoma is detected through a combination of blood tests identifying the biochemical signature of primary hyperparathyroidism and neck imaging localising the responsible gland before surgery.

Blood tests Elfcare's panel includes the key markers for identifying primary hyperparathyroidism. Relevant markers include:

• Calcium (albumin-corrected): elevated calcium is the main biochemical finding that raises suspicion for primary hyperparathyroidism.

• Parathyroid hormone (PTH): the key hormone measurement for confirming primary hyperparathyroidism. An elevated or inappropriately normal PTH in the presence of high calcium supports the diagnosis.

• Phosphate: usually low because excess hormone forces the kidneys to flush it out of your body.

• ALP: elevated levels indicate that chronic hormone overloads are actively breaking down bone tissue.

• Creatinine and eGFR: check for kidney damage or strain caused by processing too much calcium.

• Vitamin D: Identifies deficiencies that commonly worsen calcium imbalances and require correction.

• Magnesium and TSH: screen for mineral or thyroid imbalances that interfere with proper calcium control.

• Haemoglobin: checks for anemia, which can sometimes appear alongside chronic illness or genetic syndromes.

Neck MRI Elfcare’s full-body MRI can help visualise the parathyroid region and may identify an enlarged parathyroid gland. While blood tests establish the biochemical diagnosis of primary hyperparathyroidism, imaging helps localise abnormal parathyroid tissue and can support further assessment and treatment planning.

Why early detection matters

Primary hyperparathyroidism damages your body silently over time, eroding bone density, causing painful kidney stones, and increasing heart risks long before you notice obvious symptoms. However, a minor surgery to remove the enlarged gland cures the condition in over 95% of cases, allowing bone and kidney damage to stop immediately. Catching it early through paired blood panels and neck scans uncovers the root cause of chronic fatigue and bone loss, opening the door to a definitive cure that most people miss out on simply because they are never properly diagnosed.

How Elfcare can help

Elfcare's blood panel covers albumin-corrected calcium, phosphate, ALP, vitamin D, kidney function, and magnesium, providing the complete biochemical picture of primary hyperparathyroidism. The combination of elevated corrected calcium with low phosphate is the characteristic pattern that identifies primary hyperparathyroidism and distinguishes it from other causes of hypercalcaemia including malignancy, vitamin D toxicity, and sarcoidosis.

Our neck MRI images the parathyroid region and may help identify enlarged parathyroid glands. Combined with blood tests, it provides complementary information, that is, blood tests identify the biochemical pattern of primary hyperparathyroidism, while imaging helps localise abnormal parathyroid tissue and supports further clinical assessment.

If our blood tests or MRI identify findings consistent with primary hyperparathyroidism or a parathyroid adenoma, we take care of further diagnostics or refer you to the appropriate specialist.