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I presume you report your FBS as mg/dl which would equate to 8.7mmol/l. Stress hyperglycaemia is recognised to occur after stress e.g.  surgery/severe infection/myocardial infarction. 156mg/dl is not particularly high and could be a result of the physiological stress the patient is under. I would usually recommend a repeat fasting glucose or glucose tolerance test once the stress is over (generally once the patient has been discharged home). There are times when stress hyperglycaemia needs treating (often with insulin) whilst the individual is ill but once the stress passes this can be discontinued. As 156mg/dl is not very high it is unlikely to need treating.