was sind elektrolyte — what does this mean exactly?

Electrolytes are charged minerals (ions) in blood and body fluids essential for nerve impulses, muscle contractions, fluid balance, and acid-base regulation. The main ones are sodium, potassium, calcium, magnesium, chloride, and phosphate. An imbalance can cause fatigue, muscle cramps, heart arrhythmias, or confusion. Direct-to-consumer tests (e.g., blood spot or saliva) often provide only approximate values and are less reliable than clinical lab tests. Reference ranges vary by lab, age, and health status. A single value is not diagnostic; the overall picture matters. If results are abnormal or symptoms exist, consult a doctor. The evidence for the clinical importance of electrolytes is strong (medical practice), but the accuracy of home tests is often moderate to unclear. Electrolytes are not a 'wellness trend' but a serious medical parameter.