Labs and Diagnostics

Every OTC CGM caps what it displays. Lingo reports only 55–200 mg/dL — outside that, the app shows no number at all.

Glucose and A1C measure the same sugar on different clocks: one captures this morning, the other 3 months, with the last 30 days weighing heaviest.

Types of glucose tests differ more than patients expect. An A1C of 6.8% can read
6.4-7.2% on a repeat of the same blood sample.

Glucose in urine points most people straight to diabetes. That kidney threshold, quoted as 180 mg/dL, is reported from 54 to 300 in diabetes.

The oral glucose tolerance test measures two hours of your body clearing a 75g sugar load — and roughly 20% of results come back non-diagnostic.

Fasting before a glucose test means at least 8 hours, water only. But two of the five common glucose tests require it — the other three don't.

High blood sugar without diabetes usually has a plain explanation — and one of the six is simply how your test was taken. Fruit residue alone can skew it.

Low blood sugar symptoms follow a sequence: adrenaline first, then the brain running short of fuel. That order is why confusion is the more serious sign.

High blood sugar symptoms get blamed on work, screens, antibiotics. Meanwhile 27.6% of US adults with diabetes don't know they have it.

Blood sugar after eating has no single normal. CDC puts the post-meal target under 180 mg/dL with diabetes — the figure without one comes from a lab
test.

A fasting glucose of 126 is the result people most hope was a lab error. The 2026 Standards of Care say the common error runs the other way.