Essential Electrolytes in Blood Tests

This chapter explains electrolytes—key minerals in blood and body fluids such as sodium, potassium, calcium, chloride, bicarbonate, and magnesium—that keep you balanced, hydrated, and functioning properly. Together they regulate fluid levels, muscle and nerve activity, heart rhythm, bone strength, digestion, and acid–base balance, and even small shifts can affect how you feel. By the end, you’ll understand how these minerals interact, what your test results mean, and why their roles are vital for health.