Will individual participant data (IPD) be shared publicly (including data dictionaries)?  

Patients attending Pre-Anaesthesia Clinic for pre‑anaesthesia evaluation and risk stratification before planned elective surgeries fulfilling inclusion criteria will be included in the study. Their demographic parameters, date of arrival in PAC, ASA status, Grade of surgery according to NICE guidelines will be recorded. Number of investigation already performed before arriving in PAC and their results in terms of normal and abnormal tests will be noted. Tests will be considered as abnormal if they are not within normal limits as assigned by institutional laboratory. Based on the guidelines, the tests will considered as required or not required. Number of newly diagnosed comorbidity (disease) from the investigations will also be noted. Numbers of abnormal tests and their impact will be expressed in absolute number as well as percentage scale

These patients will then be traced on the day before surgery when they undergo pre-operative evaluation again, here patients satisfaction towards pre-operative clinic will be accessed. Then on the day of surgery, patient’s plan of anaesthetic management will be noted.

An abnormal test result will be said to be impactful if it resulted in referral, delay, further investigations, retesting as well as changes in plan of anaesthetic management. Impact will be considered to be significant only if it led to a change in the perioperative anaesthetic management (i.e., postponing the elective case for further optimisation, changes in the on‑going management, altering the anaesthetic procedure and monitoring plan.)

Cost analysis will be done for every test that will be considered not necessary based on NICE guidelines. The financial implications on the patient and the institute will be analysed.

The investigations done for diagnostic purposes will be excluded from this study. Any disease specific investigation which could be expected from patients history or clinical examination will not be considered impact as these will not be routine investigation.

The data will be collected by a fixed designated anaesthesiologist for the entire duration of the study. However, designated anaesthesiologist will not filter out any investigations. The designated anaesthesiologist (data collector) also will not intervene to modify the PAC process conducted by other colleague of the same rank. No surgeons or the anaesthesiologists will be informed about the study to remove bias. The patients who will be directly evaluated by the designated anaesthesiologist will not included in the study