Routine screening for gestational diabetes during pregnancy, crucial for ensuring maternal and fetal health, is gaining renewed attention as experts highlight the importance of early detection and management to prevent long-term complications.
Many pregnant women dread the oral glucose tolerance test, or OGTT, but the screening is a routine way to check how the body handles sugar during pregnancy. According to medical guidance summarised by Medical News Today and the US Preventive Services Task Force, gestational diabetes can develop even in people who had no diabetes before pregnancy, which is why screening is generally recommended at 24 to 28 weeks’ gestation. Nutritionist Gao Minmin says the timing matters because the condition can emerge quietly and only become visible through testing.
The test itself is straightforward. After fasting, a blood sample is taken, the patient drinks a glucose solution, and blood is checked again one and two hours later to see how efficiently the body clears the sugar load. The Mayo Clinic says this is designed to measure glucose processing, while the American Diabetes Association describes it as one of the main tools used to detect gestational diabetes. The usual thresholds are a fasting level below 92 mg/dL, a one-hour level below 180 mg/dL and a two-hour level below 153 mg/dL; if any one reading meets or exceeds the limit, gestational diabetes may be diagnosed.
Pregnancy changes the way the body responds to insulin. As Gao explains, placental hormones help the baby grow but can also make the mother’s tissues less sensitive to insulin, creating insulin resistance and raising blood sugar. That is why even women with normal glucose levels before pregnancy can develop gestational diabetes later on. The American Academy of Family Physicians and other clinical guidance also note that screening is useful because treatment can improve outcomes for both mother and baby.
If gestational diabetes is left unmanaged, the risks can extend beyond a higher number on a test report. Gao warns that it can increase the chance of too much amniotic fluid, premature birth, pregnancy complications such as pre-eclampsia, and a larger baby, which can make vaginal delivery more difficult and raise the likelihood of caesarean birth. After delivery, a baby exposed to high glucose levels in the womb may face low blood sugar, breathing problems or adaptation issues. Longer term, research cited in the summaries links poor glucose control in pregnancy with a greater risk of childhood obesity, metabolic disease and type 2 diabetes, with some studies also suggesting possible effects on attention, learning and behaviour.
The message, though, is not to panic. Gao says gestational diabetes is manageable, and most women can bring their blood sugar under control through dietary changes, regular activity and medical follow-up. She also cautions against skipping meals or cutting out starches before the test in an attempt to “pass” it, because that can distort the result. The safest approach is to take the screening at the recommended stage of pregnancy, understand the numbers, and act early if treatment is needed.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
