Most blood tests only take a few minutes to complete ... (when your parathyroid glands release too much parathyroid hormone (PTH), a hormone that helps control calcium levels in your blood ...

PTH is made in your parathyroid glands ... Your doctor can keep an eye on these organs with regular blood tests and bone density scans (measures your bone thickness). See your dentist regularly.

Over the past few decades, the "normal" blood level of vitamin D (25-OH vitamin D) was based on the amount needed to keep PTH from becoming abnormally high. Again, PTH at high levels can cause ...