Regular pregnancy checkups are especially important for pregnant women, and some people wonder why the results are so different when they get the checklist. The common units of estradiol are usually pmol/l and pg/ml, and the conversion between these two units is 1 pg/ml equals 3.67 pmol/l divided by 3.67, which means that 1 pmol/l equals 3.67 pg/ml. The units of measurement used may also vary due to the different kits used by each hospital to test for the indicator. However, regardless of the variation in units, there is nothing to worry about as long as the value is within the normal range of its corresponding value. Therefore, if a pregnant woman does not have the test results with her, she must inform the doctor in detail of the values and units of the test to avoid diagnostic errors.