Why calcium, PTH, vitamin D, kidney function, and urine calcium must be interpreted together. Primary hyperparathyroidism testing starts with a relationship: when blood calcium rises, parathyroid hormone (PTH) should fall. A PTH result that stays […]
Originally published May 10, 2026. Updated August 26, 2026. Iron status is not one laboratory number. A serum iron result can change with meals, supplements, time of day, illness, and ordinary biological variation. Ferritin estimates […]
Magnesium, a silver-white earth metal, plays a pivotal role in countless physiological processes, impacting everything from our energy production to our brain function. When we think of essential nutrients, magnesium might not be the first […]
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