tootz999 wrote:How do you change 300mg/dl as micromoles/ml
Whatever you have 300 mg of, you have to know its molecular weight. A mole of a substance is a number of grams equal to its molecular weight. It is different for every substance.
You also have the minor problems of prefixes, milli to micro, milli to deci, but these are all powers of ten, search for SI prefix.