I recently had day surgery under local anesthestic, whilst they monitored my blood oxygen levels they were concerned that they never rose above 72 and they seemed to stay at around 65/69, should I see my own GP for this, is this something I should be worried about

Yes I think you should see your GP, but when meeting with your surgeon, he didn't mention this is beyond me. Did you meet with your surgeon for a follow up, you didn't say what the surgery was for.

Low oxygen in the blood, and yours is low, can at at times signify congestive heart failure, chronic obstructive pulmonary disease, or asthma, any other chronic breathing abnormalities. This is not saying this is your problem, these are general guidelines for low oxygen levels. Normal is 95 to l00.

I mention these are general guidelines for low oxygen guidelines because we cannot diagnose on AMHD.

Of course, age and smoking, and a host of other habits can determine the cause.

Yes I am surprised they continued with it that low. You need to see your doctor. The level should be above 90. At that level perhaps you misunderstood the reading, since I would have thought they would have make it clear how dangerous this level could be.

Low Oxygen Levels: How Low is Too Low and Should You Worry? : Heart Failure Solutions (http://www.heartfailuresolutions.com/34/oxygen/low-oxygen-levels-how-low-is-too-low-and-should-you-worry)

What Is a Normal Resting Blood Oxygen Level? | 3FC (http://www.3fatchicks.com/what-is-a-normal-resting-blood-oxygen-level/)