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Fasting before surgery: hidden danger for kids?

NCT ID NCT07259629

Knowledge-focused Sponsor: Guy's and St Thomas' NHS Foundation Trust Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jul 23, 2026 · Updated 3 times

Summary

This study looks at how often children develop low blood sugar (hypoglycemia) after fasting before anesthesia for elective procedures. Researchers will monitor blood sugar levels in over 6,500 children aged 1 month to 18 years to find a clear definition of hypoglycemia and identify risk factors. The goal is to improve fasting guidelines and prevent harm.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this could lead to clearer safety guidelines for fasting before anesthesia in children, reducing the risk of low blood sugar.
What could go wrong
This is an observational study, not testing a treatment. It may not produce definitive results due to its large, diverse population and lack of a control group.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

2,902 people

The number who actually took part.

Started

May 2025

Finished

May 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Pediatric patients fasting for a procedure under general anesthesia

Ages

1 month to 18 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * All American Society of Anesthesiology score (ASA) 1 - 3 children aged 1 month to 18 years presenting for an elective procedure involving general anaesthesia during the defined study period * All elective cases, day cases will be included (patient's admitted the night before for bowel preparation prior to elective colonoscopy should also be included) * Planned expedited cases in ASA 1 / 2 children should be included, for example nail bed repairs, lacerations, foreign body (in ear / eye / nose), simple fractures for manipulation under anesthesia / k-wires * MRI, radiology and dental cases will be included provided the patient receives a general anaesthetic Exclusion Criteria: * Children aged less than 1 month * Procedures performed under oral sedation or local anaesthesia only * ASA status 4 and 5 * Children with any endocrine or metabolic condition or who have a fasting plan prior to general anaesthesia for glucose control: * Type 1 or 2 diabetes mellitus, medium chain acetyl Co-enzyme A, maple syrup urine disease, glycogen storage disease, galactosaemia, urea cycle defects, familial hypercholesterolaemia, congenital disorders of glycosylation, lysosomal storage disorders, organic acidaemias, mitochondrial disorders, adrenal gland disorders, adrenoleukodystrophy, growth disorders, lipid disorders, multiple endocrine neoplasia type 1 and 2, pituitary disorders. * Emergency and oncology procedures as these children will have different risk factors for hypoglycaemia * Anaesthetic involvement in critically ill children e.g. airway management in emergency department, pediatric intensive care unit * Children on glucose containing intravenous solutions or total parenteral nutrition pre-operatively * Children on systemic steroid treatment (oral / intravenous). Children on inhalers / topical steroids should be included

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Conditions

The condition(s) this trial relates to.

hypoglycemia

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Anesthesia Hypoglycemia; iatrogenic Pediatrics

Contacts and locations

Locations

  • Addenbrooke's Hospital

    Cambridge, United Kingdom

  • Birmingham Women and Children's Hospital

    Birmingham, United Kingdom

  • Buckinghamshire Healthcare NHS Foundation Trust

    High Wycombe, United Kingdom

  • Chelsea and Westminster Hospital

    London, United Kingdom

  • Children's Hospital of Wales

    Cardiff, United Kingdom

  • Evelina London Children's Hospital

    London, SE17EH, United Kingdom

  • Great Northern Children's Hospital

    Newcastle, United Kingdom

  • James Cook University Hospital

    Middlesbrough, United Kingdom

  • King's College Hospital

    London, United Kingdom

  • Moorfields Eye Hospital

    London, EC1V 2PD, United Kingdom

  • Ninewells Tayside Hospital

    Dundee, United Kingdom

  • Nottingham Children's Hospital

    Nottingham, United Kingdom

  • Royal Aberdeen Infirmary

    Aberdeen, United Kingdom

  • Royal Belfast Hospital for Sick Children

    Belfast, United Kingdom

  • Royal Devon University Healthcare NHS Foundation Trust

    Exeter, Devon, EX2 5DW, United Kingdom

  • Royal Hospital for Children

    Glasgow, United Kingdom

  • Royal Hospital for Sick Children

    Edinburgh, United Kingdom

  • Royal London Hospital

    London, United Kingdom

  • Salisbury NHS Foundation Trust

    Salisbury, United Kingdom

  • Sheffield Children's Hospital

    Sheffield, United Kingdom

  • St George's Hospital

    London, United Kingdom

  • St Mary's Hospital

    London, United Kingdom

  • Ulster Hospital

    Belfast, United Kingdom

  • University hospital of Plymouth

    Plymouth, United Kingdom

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