Bariatric Surgery: WH

NCL Wide

The bariatric service at Whittington Hospital (WH) is known as the North London Obesity Surgery Service (NLOSS).

The bariatric surgical procedures provided by WH consultants include:

  • Roux-en-Y gastric bypass
  • sleeve gastrectomy
  • one anastomosis/mini gastric bypass
  • laparoscopic adjustable gastric band.

Eligibility Criteria


  • BMI 35-39.9kg/m2 with a qualifying co-morbidity (e.g. type 2 diabetes, high blood pressure, osteoarthritis, polycystic ovary syndrome, obstructive sleep apnoea, hyperlipidaemia metabolic syndrome)
  • BMI 40-50kg/m2 with no co-morbidity required
  • patients would have tried non-surgical measures for at least six months and failed to achieve or maintain adequate clinically beneficial weight loss
  • patients with a BMI of >50kg/m2 do not need a proof of prior engagement with a weight loss programme, however they still need to demonstrate engagement with the workup process at NLOSS, undergo all recommended investigations, meet and maintain a weight loss goals assigned by the NLOSS clinicians.

How to Refer


Referral methods: e-Referrals

Refer via e-RS

For urgent cancer referrals, see the 2WW page.

The NLOSS team requires a referral letter from a medical practitioner, which should be addressed to a consultant, before an appointment can be made.

The referring clinician must ensure that the patient’s weight, height, BMI, past medical/co-morbidities and dieting history are clearly stated in the referral letter. Failure to include these details will result in a rejection of the referral.

How to find service on e-RS

  • Specialty: GI and Liver (Medicine and Surgery)
  • Clinic type: Upper GI including Dyspepsia
  • Service name: Surgery Bariatric Service - Whittington Hospital - RKE


North London Obesity Surgery Service

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Review date: Thursday, 10 July 2025