If you have a surgery scheduled, your hospital will likely book you for a pre-operative (pre-op) assessment. To the patient, this can sometimes feel like an unnecessary hurdle, but for the surgical team, it is the most critical step in ensuring a successful outcome.
A pre-op assessment is a physical and clinical evaluation to ensure you are healthy enough for surgery and—most importantly—safe to undergo general anesthesia.
This appointment usually takes place two to four weeks before your surgery date. It is a comprehensive health check-up led by a specialised nurse or an anesthesiologist. Depending on the complexity of your upcoming procedure, the assessment typically includes:
Medical History Review: A deep dive into your existing conditions (like diabetes or heart disease) and any previous reactions to anesthesia.
Physical Examinations: Checking your blood pressure, heart rate, oxygen levels, and Weight/BMI.
Infection Screening: A routine “MRSA swab” (usually from the nose or throat) to check for bacteria that could cause post-surgical infections.
Diagnostic Tests: Depending on your age and health, you may need an Electrocardiogram (ECG) to check your heart or a chest x-ray.
Just as in a pre-chemotherapy clinic, blood work is the “gold standard” for surgical clearance. Doctors look for:
Hemoglobin Levels: To ensure you aren’t anaemic, which could cause complications during blood loss.
Clotting Factors: To verify your blood will clot correctly after the incision.
Kidney Function: To ensure your body can safely process the anesthetic drugs.
Modern healthcare has made many assessments more flexible. Here is how they differ:
| Assessment Type | When It’s Used | What to Expect |
| Face-to-Face | Major surgeries (Joint replacement, Heart, Abdominal) | Physical exams, blood draws, and MRSA swabs. |
| Telephone/Video | Minor surgeries (Cataracts, Simple biopsies) | A verbal review of health history and medications. |
| Digital/Online | Very low-risk patients | A self-reported questionnaire submitted via a patient portal. |
One of the most important reasons to attend your pre-op clinic is to receive instructions on medication management. Certain drugs can be dangerous during surgery:
Blood Thinners (Anticoagulants): These often need to be stopped several days prior to prevent excessive bleeding.
Diabetes Medication: Insulin doses may need to be adjusted because you will be “nil by mouth” (fasting).
Herbal Supplements: Some natural supplements (like Garlic or Ginger) can actually interfere with blood clotting.
To ensure your surgery isn’t delayed, come prepared with the following:
A printed list of all current medications and dosages.
Details of any allergies (especially to latex or specific medicines).
Any recent letters from other specialists (like a cardiologist or neurologist).
Pro-Tip: If you are having a “Day Surgery” (going home the same day), the pre-op assessment is also when the team will verify that you have a responsible adult to drive you home and stay with you for 24 hours.
The pre-operative assessment isn’t just a formality; it is a custom-built safety plan designed specifically for your body.
By identifying potential risks early, the team can adjust the anesthetic plan or provide preventative antibiotics, significantly reducing the chance of complications.
This is very good video on pre-op assessment.
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