My Dad (diabetic) and I went to a doctor for a checkup. The doctor advised my dad to increase his insulin because his sugar was high in those days. Furthermore doctor told my dad to call him after a week to let him know about his sugar.
It's day 3, but my dad's sugar has been low so far. Would the following sentence be fine for telling the doctor about his blood sugar?
Its has been 3 days since you told me to increase his insulin but his sugar has been low, now what to do?
The main thing I want to know is the use of has been.