Increased Magnesium (Hypermagnesemia)

• Renal Impairment – Decreased excretion in kidney disease can lead to hypermagnesemia.
• Excessive Supplementation or Iatrogenic Causes – High doses of magnesium (e.g., medications used to treat preeclampsia) can elevate serum levels.
• Endocrine Disturbances – Certain adrenal or parathyroid disorders can alter magnesium balance.
• Severe Dehydration: Fluid loss can concentrate magnesium in the blood.

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Decreased Magnesium (Hypomagnesemia)

• Gastrointestinal losses – Diarrhea, malabsorption syndromes, or chronic gastrointestinal infections can lower magnesium levels.
• Inadequate intake – Poor dietary intake, as seen in malnutrition or certain autoimmune gastrointestinal disorders, can lead to hypomagnesemia.
• Hyperthyroidism or diabetes – These conditions may contribute to increased loss of magnesium.

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Life-Stage Considerations for Magnesium

• Infants/Children – Magnesium needs are high during growth; deficiency can interfere with development.
• Adults/Elderly – Older adults are especially vulnerable to hypomagnesemia, which may contribute to arrhythmias and neuromuscular instability.

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Electrolyte and Mineral Markers

This group of markers evaluates essential ion and mineral levels in the blood, each playing a critical role in maintaining physiological balance:

• Blood Phosphorus: Reflects circulating phosphate levels, crucial for bone health and energy metabolism, influenced by renal excretion and hormonal control.
• Plasma Potassium: Indicates the concentration of potassium, vital for proper nerve function and muscle contraction.
• Plasma Sodium: Measures the main extracellular ion responsible for osmotic balance and fluid distribution.
• Serum Calcium: Reveals calcium levels that support neuromuscular activity, cellular signaling, and bone health.
• Serum Magnesium: Assesses magnesium status, important for enzymatic reactions and muscle and nerve function.
• Lithium: Although primarily of therapeutic interest, its circulating levels interact with water and electrolyte balance, mirroring renal handling similar to other electrolytes.

Together, these markers provide a comprehensive view of the body's mineral balance and electrolyte function.

Hormonal Regulators of Electrolytes and Minerals

• Parathormone (PTH) adjusts calcium and phosphate levels via its influence on bone resorption and kidney reabsorption
• Antidiuretic Hormone (ADH) modulates water reabsorption in the kidneys to indirectly control plasma sodium levels and overall fluid balance. Together, these markers provide a

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