To test basal basically set a time to eat/inject qa say 8am. hard bit is to not eat for 5 hours. (some would say 4 hours but me thinks qa can last up to 5). This is to make sure all carbs eaten at 8am have fully digested and all qa insulin has been used. If you need to treat a high/low abandon test.
Assuming all is good till 1pm, no other food/sugary drinks consumed take a reading at 1pm. Hopefully it will be between 5 and 8. Record readings every hour from 1pm till 5pm. You wil then see what effect your basal has on your levels. I do 4 hours fasting as you can then split the 12 hour day into 3, 4 hour slots.
Only miss 1 meal a day as going much longer during the day would give inaccurate readings as the liver would overcomponsate.
To do morning basal test best just to wake up at your usual time and record readings every hour till lunch if poss till 1pm.
To do evening meal have lunch at say 1pm, test every hour from 6pm till 10\11pm. During any test abandon if needing sugar/carbs or correction bolus. Adjust qa next time for meal previous depending on results and try to repeat test another time. Doing the above would give you fasting readings for the while day. Doing this will give your fasting day time readings on different days from 8~1, 1~6, and 6 till 10/11pm giving a whole day profile pic your basal.
The night time one involves eating at say 6pm, again consuming nothing till 11pm. carry on starving and take readings every 2 hours through the night as 1 hourly can be exhausting.
Same way applies to pump and mdi, however pump easier to componsate for changes needed as can be done hourly without effecting other parts of the day.
For example on mdi you may find you need more basal in the middle of the day, but, if you increase your basal you would be having too much through the night.
Hope that explains it, anything unsure of just ask
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