What to know about glucose tolerance testing while fasting in Ramadan

A glucose tolerance test checks how your body handles a measured glucose drink. The appointment commonly involves an initial blood sample, drinking the solution, and further samples after timed waiting periods. You may need to avoid food and certain drinks before and during the test, while remaining seated at the centre. The exact instructions differ, so the laboratory's directions take priority.

Tell the maternity team and testing centre that you are observing Ramadan when the test is ordered. Ask whether the appointment can be scheduled at a suitable time, whether fasting must be completed outside daylight hours, and what you may drink. Do not eat, drink, exercise, or take supplements during the test unless instructed. Bring a snack for afterwards and arrange support if fasting makes you light-headed.

Tell staff immediately if you feel faint, sweaty, shaky, confused, nauseated, or unwell during the appointment; they can assess you and decide whether testing should continue. Seek urgent medical help for collapse, persistent vomiting, severe weakness, or symptoms that do not improve after staff provide care. Do not reschedule independently if the test is part of pregnancy screening; contact the team for a safe alternative.

Ask whether the test can be timed around Ramadan, which fasting rules apply, what happens if you cannot complete it, and whether another assessment is appropriate. Confirm how results will be communicated and when you should receive follow-up.