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| Date | Fasting (mg/dL) | Post-Meal (mg/dL) | Status | Notes | Action |
|---|---|---|---|---|---|
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Fasting blood sugar is measured after not eating or drinking (except water) for at least 8 hours. It's typically done in the morning before breakfast.
Post-meal (postprandial) blood sugar is measured 1-2 hours after eating. It shows how your body processes glucose from food.
To test for Diabetes Mellitus, doctors primarily use blood tests that measure the concentration of glucose (sugar) in your system. Because blood sugar fluctuates based on what you eat and your activity level, different tests look at different "time windows" of your health.
As discussed, this is the most common diagnostic tool. It measures your average blood sugar over the past 2โ3 months.
This measures your blood sugar at a single point in time after you have not eaten for at least 8 to 12 hours (usually done first thing in the morning).
This is a more sensitive test often used to catch prediabetes or gestational diabetes. You fast overnight, have your blood drawn, then drink a very sugary liquid. Your blood is tested again 2 hours later to see how your body handles the "sugar challenge."
This test is used if you are experiencing severe symptoms (like extreme thirst or frequent urination). It can be done at any time, regardless of when you last ate.
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| HbA1c | < 5.7% | 5.7% โ 6.4% | โฅ 6.5% |
| Fasting Glucose | < 100 mg/dL | 100 โ 125 mg/dL | โฅ 126 mg/dL |
| OGTT (2-hour) | < 140 mg/dL | 140 โ 199 mg/dL | โฅ 200 mg/dL |
| Random Glucose | Not typically used | โฅ 200 mg/dL + symptoms | |
Unless you have clear symptoms of high blood sugar, a diagnosis usually requires two abnormal results from either the same test on different days or two different types of tests performed at the same time.
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