If you and your partner are trying to have a baby but haven’t been able to, you may start to wonder if you should get fertility tests. A blood test to check for anti-müllerian hormone (AMH) can give an idea of how well the ovaries function. This is called their ovarian reserve. Very low levels can suggest low ovarian reserve, which will impact your chance of conceiving. Although this test cannot give you a precise answer about how many viable eggs you have left or predict your chances of becoming pregnant, it can be used to help you in family planning if it shows that your AMH is abnormal for your age.