Once target control is achieved and the results of self-monitoring become quite predictable, there is little gained in most individuals from repeatedly confirming this state. There are many exceptions, such as acute illness, when new medications are added, when weight fluctuates significantly, when A1c targets drift off course and in individuals who need monitoring to maintain targets. Self-monitoring is beneficial as long as one is learning and adjusting therapy based on the result of the monitoring.
Sources:
Canadian Diabetes Association Clinical Practice Guidelines Expert Committee, et al. Monitoring glycemic control. Can J Diabetes. 2013 Apr;37 Suppl 1:S35-9. PMID: 24070960.
Davidson MB, et al. The effect of self monitoring of blood glucose concentrations on glycated hemoglobin levels in diabetic patients not taking insulin: a blinded, randomized trial. Am J Med. 2005 Apr;118(4):422-5. PMID: 15808142.
Farmer A, et al. Impact of self monitoring of blood glucose in the management of patients with non-insulin treated diabetes: open parallel group randomised trial. BMJ. 2007 Jul 21;335(7611):132. PMID: 17591623.
O’Kane MJ, et al. Efficacy of self monitoring of blood glucose in patients with newly diagnosed type 2 diabetes (ESMON study): randomised controlled trial. BMJ. 2008 May 24;336(7654):1174-7. PMID: 18420662.