Blood ketone testing measures ketones in a finger-prick blood sample. Rising ketones are an early warning sign of diabetic ketoacidosis (DKA), especially for people who use insulin.
NDSS guidance for people living with type 1 diabetes: below 0.6 mmol/L is normal (provided there are no symptoms) and sick day plans should be followed. From 0.6 to 1.5 mmol/L, start your sick day action plan and check glucose and ketones every 2 to 4 hours. From 1.5 to 3.0 mmol/L there is a serious risk of DKA, so contact your doctor or diabetes team straight away if levels are not falling. At 3.0 mmol/L or above, go to an emergency department or call 000.
People taking SGLT2 inhibitor medicines can develop ketoacidosis with near-normal glucose, so ketone testing when unwell matters for them too. Blood ketone strips are subsidised through the NDSS.
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