The change in the recipe of a popular energy drink has meant nearly 200 women could need to be retested for gestational diabetes.
Lucozade Energy was used during glucose tolerance tests (GTT) at the Norfolk and Norwich University Hopsital (NNUH), in Norwich, and the James Paget University Hospital (JPUH) in Gorleston.
The test, which checks how well the body regulates blood sugar, is offered when a midwife thinks there is a chance a woman could develop gestational diabetes.
It involves taking a blood test after the woman has fasted. She then drinks a sugary drink - in this case Lucozade Energy - and another blood test is taken one or two hours later.
But in November last year, Lucozade announced plans to cut its sugar content in the drink.
A spokesman from NNUH said: 'On April 21, it came to our attention that Lucozade Ribena Suntory (LRS) had changed the product - Lucozade Energy - we used for the pregnancy oral glucose tolerance test, altering the sugar content, and therefore a cohort of women who may have been affected were contacted.
'As a result of this change, some of the test results may have been calculated incorrectly, using the previous sugar content as a basis.
'The trust contacted approximately 150 women to discuss whether a repeat test was required (60 women were retested). No harm was caused to any women or babies.
'We contacted LRS who provided us with copies of their informational materials, which we then shared with other local trusts and services in case they were not aware of the potential issue.
'We are very sorry for this inconvenience and appreciate everyone's understanding and patience while we addressed the issue.'
Head of Midwifery and Gynaecology Services at JPUH Jayne Utting added: 'As soon as we became aware of this issue, we immediately contacted the women affected - a total of 36 - by telephone to inform them of the situation and offer a repeat test.
'We have also sent follow-up letters, apologising for any inconvenience caused.'
A Lucozade Ribena Suntory spokesman said: 'We are aware that Lucozade Energy is sometimes used for medical purposes including the oral glucose tolerance test. Since January 2017, we have been communicating the change in sugar content of Lucozade Energy to healthcare professionals. The new reduced sugar formulation came into effect from April 1, 2017.
'We have sent communications about the sugar reduction recipe change to the relevant health care organisations and associations including The Royal College of Midwives, The Royal College of Pathologists and The Royal College of Obstetricians and Gynaecologists as well as advertising the changes in the relevant healthcare media. Consumers who want information on the change of recipe should visit our website www.lrsuntory.com or call 0800 096 3666.'
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