Random sugar Random Plasma Glucose (RBG)
Your blood sugar at the moment the blood was taken, fed or not.
Also printed asRandom Blood Glucose · RBG · Random Glucose · Random Blood Sugar · RBS · Blood Sugar Random · Plasma Glucose Random
What it measures
Your blood sugar at the moment the sample was drawn, whether or not you had eaten.
A single snapshot of how quickly you clear a meal; it moves with what and when you last ate.
Why it matters for how long you stay well
On its own it settles nothing. The fasting number and the three-month average are the ones that track the slow damage to arteries and nerves.
How it shows up in daily life
It moves with your last meal, so a high number here often just means you ate shortly before the draw.
High and low readings
When it reads high
Sugar was high at the time of the draw; the fasting and three-month numbers decide whether that matters.
When it reads low
Sugar was low at the draw, usually a long gap since eating.
What moves it
Daily life
- what you ate and how long ago
- illness or stress on the day
- sleep the night before
Medicines known to shift it
- steroids (raise it)
- metformin (lowers it)
- GLP-1 medicines (lower it)
Listed so a result can be read in context. It is not advice to start, stop or change any medicine; that decision belongs with your physician.
Common questions
What does Random Plasma Glucose measure?
Your blood sugar at the moment the sample was drawn, whether or not you had eaten. A single snapshot of how quickly you clear a meal; it moves with what and when you last ate.
What does a high Random sugar result usually mean?
Sugar was high at the time of the draw; the fasting and three-month numbers decide whether that matters.
What does a low Random sugar result usually mean?
Sugar was low at the draw, usually a long gap since eating.
What is the usual reference range for Random sugar?
A broad adult reference band is 70–140 mg/dL. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Adults
- 70–140 mg/dL
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in mg/dL
Ageing relevance
2/5
Relevant to the ageing of one organ, or to disease screening.
Worth knowing
Blood sugar peaks about an hour after a meal and usually settles back within two hours.
Have a report with this marker on it? Read it in context.
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