blood sugar

American  

noun

1. glucose in the blood.

2. the quantity or percentage of glucose in the blood.

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blood sugar British  

noun

1. med the glucose concentration in the blood: the normal fasting value is between 3.9 and 5.6 mmol/l

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blood sugar Scientific  

1. Sugar in the form of glucose in the blood. The concentration of blood sugar is measured in milligrams of glucose per 100 milliliters of blood.

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Etymology

Origin of blood sugar

First recorded in 1925–30

Example Sentences

He is now doing well but his condition needs to be carefully managed – his diet must be closely watched and his blood sugar checked.

From BBC • Jun. 22, 2026

Their A1C, a measure of blood sugar, was elevated.

From The Wall Street Journal • Jun. 22, 2026

People with diabetes are about 60% more likely to develop dementia than those without, and frequent episodes of low blood sugar are linked to a 50% higher chance of cognitive decline.

From Science Daily • Jun. 17, 2026

High blood sugar impairs immune function and narrows vessels that carry oxygen-rich blood, making it harder for skin to heal.

From Los Angeles Times • Jun. 14, 2026

“If he doesn’t take his medication like he is supposed to, he will! Checking his blood sugar, eating a balanced diet—he doesn’t want to do any of this!”

From "When Dimple Met Rishi" by Sandhya Menon

Related Words

• glucose