Magnesium Lab Test Interactions

Magnesium's effect on lab tests

Magnesium has the following effect on lab tests:

  • Serum and urine pH levels
    Magnesium supplements may decrease the pH levels of serum and urine.
  • Serum phosphate
    Magnesium supplements could also either increase or decrease serum phosphate levels.
  • Stomach acid secretion
    Tests to determine stomach acid secretions will have incorrect results when magnesium is supplemented.

People who are taking magnesium supplements should let their doctor know and should also stop taking supplements about 3-4 days prior to having any type of lab tests.

Magnesium supplements have an effect on some lab tests. Supplements should be stopped about 3-4 days prior to the lab tests

Interactions with other substances

There are none reported.


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