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Mr Siraj Rajaratnam - General & Colorectal Surgeon

Private Service, General Surgery


Mr Siraj Rajaratnam - Colorectal and General Surgeon and Endoscopist

Siraj is a New Zealand born and trained general surgeon who offers a private practice on the North Shore of Auckland. He has sub-specialty expertise in colorectal surgery and is a consultant surgeon at Waitemata DHB.

Siraj specialises in the management of the full range of colorectal conditions including:

  • colorectal cancer
  • inflammatory bowel disease
  • diverticular disease and
  • minor anorectal conditions such as haemorrhoids, fissures and fistulas.
He has particular interest in pelvic floor disorders such as rectal prolapse and faecal incontinence. Siraj also provides colonoscopy and general surgery such as gallbladder, hernia and skin surgery.
Siraj provides colonoscopy with Waitemata Endoscopy
What is General Surgery?
The role of the General Surgical Department varies from hospital to hospital, but in broad terms general surgery can be said to deal with a wide range of conditions within the abdomen, breast, neck, skin and, in many hospitals, vascular (blood vessel) system.
While the name would suggest that the focus of general surgery is to perform operations, often this is not the case. Many patients are referred to surgeons with conditions that do not need surgical procedures, but merely require counselling or medical treatment.
What is Colorectal Surgery?
The colon and the rectum are part of the digestive tract that processes the food we eat. Together they make up the large intestine or large bowel and are located in the abdomen between the small intestine and the anus. The colon is about 1.8m long and absorbs water and nutrients from food. The rectum is the last segment of the large intestine and is about 20 -25cm long. This is where waste material is stored before it passes out of the body through the anus.

A colorectal surgeon is a general surgeon who has had further training and specialises in the diagnosis and treatment of diseases of the colon, rectum, and anus.

Further reading can be found here


Referral Expectations

When you come to your appointment, your surgeon will ask questions about your illness and examine you to try to determine or confirm the diagnosis. This process may also require a number of tests (e.g. blood tests, x-rays, scans etc). Sometimes this can all be done during one visit, but for some conditions this will take several follow-up appointments. Occasionally some tests are arranged even before your appointment to try to speed up the process.
Once a diagnosis has been made, your surgeon will discuss treatment with you. In some instances this will mean surgery, while other cases can be managed with medication and advice. If surgery is advised, the steps involved in the surgical process and the likely outcome are usually discussed with you at this time.


Siraj is a Southern Cross Affiliated Provider for the follow endoscopy procedures with the Waitemata Endoscopy service: 

  • Colonoscopy
  • Flexible Sigmoidoscopy   

As an Affiliated Provider, prior approval and claims processes are organised on the member's behalf.

Procedures / Treatments

  • Colorectal Cancer

    This is cancer that begins in your colon or rectum.… More

  • Inflammatory Bowel Disease (IBD)

    There are two types of IBD, ulcerative colitis and Crohn’s disease.  In these conditions, the immune system attacks the lining of the colon causing inflammation and ulceration, bleeding and diarrhoea.  In ulcerative colitis this only involves the large intestine, whereas in Crohn’s disease areas within the entire intestine can be… More

  • Haemorrhoids

    Haemorrhoids are a condition where the veins under the lining of the anus are congested and enlarged.… More

  • Colectomy (Bowel Resection)

    Laparoscopic: several small incisions (cuts) are made in the abdomen and a narrow tube with a tiny camera attached (laparoscope) is inserted.… More

  • Colostomy

    An opening is made in the skin of the abdomen (stomach) to allow drainage of stools (faeces) from the colon into a collection bag on the outside.… More

  • Rectal Resection

    Laparoscopic: several small incisions (cuts) are made in the abdomen (stomach) and a narrow tube with a tiny camera attached (laparoscope) is inserted.… More

  • Gastroscopy

    Gastroscopy allows examination of the upper part of your digestive tract i.e.… More

  • Colonoscopy

    Colonoscopy is the examination of your colon (large bowel) using a colonoscope (long, flexible tube with a camera on the end).… More

  • Sigmoidoscopy

    A long, narrow tube with a tiny camera attached (sigmoidoscope) is inserted into your anus and moved through your lower large intestine (bowel).… More

  • Skin Disorders

    Skin conditions dealt with by general surgery include lumps, tumours and other lesions of the skin and underlying tissues.… More

  • Gastrointestinal Disorders

    Conditions of the gut dealt with by general surgery include disorders of the oesophagus, stomach, small bowel, large bowel and anus.… More

  • Gallstones

    General surgery covers some disorders of the liver and biliary system.… More

  • Hernias

    A hernia exists where part of the abdominal wall is weakened, and the contents of the abdomen push through to the outside.… More

Public Transport

The Auckland Transport website is a good resource to plan your public transport options.


Free patient parking is available at the front of the practice, alternatively 2hr free street parking is available on Shea Terrace.

Contact Details

Contact Waitemata Specialist Centre on the above numbers for enquiries and referrals.

Waitemata Specialist Centre
15 Shea Terrace

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Street Address

Waitemata Specialist Centre
15 Shea Terrace

This page was last updated at 9:48AM on October 3, 2021. This information is reviewed and edited by Mr Siraj Rajaratnam - General & Colorectal Surgeon.