: How fast can serum calcium, magnesium and potassium levels change? Can serum electrolytes (such as Ca Mg or K) within NORMAL limits rise or drop substantially within 12-24 hours? Enough to go outside of normal range, even

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Yes, there are conditions that cause this. One of the most well known is familial periodic paralysis.

Each form of familial periodic paralysis involves a different gene and electrolyte channel. In 70% of affected people, the hypokalemic form is due to a mutation in the alpha-subunit of the voltage-sensitive muscle calcium channel gene on chromosome 1q (HypoPP type I). In some families, the mutation is in the alpha-subunit of the sodium channel gene on chromosome 17 (HypoPP type II).

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Answer:

Blood levels for electrolytes are maintained by homeostasis in most people, primarily in the kidneys. But they can actually vary quite widely within hours - depending on health conditions and medications. It can even vary fatally in some (rare) cases.

Why I cannot give a more complete answer:

There are too many possible reasons to discuss adequately in an answer. Therefore it would have to be individualized, which we can't do here.

Advice:

Gather all your results and take them to a primary care doctor (or GP or whatever they're called where you're from) along with a list of your symptoms (in chronological order) and questions. They can guide your evaluation.