Gestational diabetes is formally defined as "any degree of glucose intolerance with onset or first recognition during pregnancy".[4] This definition acknowledges the possibility that a woman may have previously undiagnosed diabetes mellitus, or may have developed diabetes coincidentally with pregnancy. Whether symptoms subside after pregnancy is also irrelevant to the diagnosis.[5] A woman is diagnosed with gestational diabetes when glucose intolerance continues beyond 24–28 weeks of gestation.