How often should I measure the DHA in my breast milk?

If your DHA levels are optimum with your first testing, and you maintain the same health status, diet, and/or supplements, then once is enough. However, if your levels are low, and you decide to increase your intake of DHA (via fish or fish oil pills), then you can take the test as soon as two weeks after your previous test. (It only takes two weeks to change the levels of DHA in your breast milk!