Floaters and Flashing Lights What Are Floaters? Floaters are dark specks in the form of dots, circles, lines, or cobwebs that seem to move across your field of vision. They are most noticeable when you are looking at a light-coloured background, such as a clear sky or a white wall.
Testing magnesium levels to find if they are normal requires a simple blood draw. Levels are considered normal in the range of 1.7 to 2.2 mg/dL. Your doctor might choose to test your magnesium levels if you have tested low for potassium and calcium or if you have a history of kidney disease. Sometimes your body will released store magnesium from your bones to make up for a deficiency.
How much magnesium do you need? About 60% of your magnesium is in your bones, the rest is in body tissues, and only about 1% is in your blood. Adult men should take in 400 mg, while women should get 310 mg; this increases to 420 mg and 320 mg, respectively, after age 30.