What is interstitial fluid glucose?

Interstitial fluid is the fluid that surrounds the cells of your tissue below your skin, and usually glucose moves from your blood vessels and capillaries first and then into your interstitial fluid.

Does interstitial fluid have glucose?

Interstitial fluid contains glucose, salt, fatty acids and minerals such as calcium, magnesium and potassium. The nutrients in interstitial fluid come from blood capillaries Interstitial fluid can also hold waste products which result from metabolism.

How does glucose get into the interstitial fluid?

Glucose freely diffuses from capillaries into interstitial fluid. In insulin-responsive tissues (skeletal muscle, adipose, and heart tissue), the glucose transport into the cells is facilitated by insulin-responsive glucose transporter-4 (GLUT-4).

What fluid does a CGM measure?

Different to traditional blood glucose measurement systems, systems for continuous glucose monitoring (CGM) measure glucose in interstitial fluid (ISF). The assumption is that glucose levels in blood and ISF are practically the same and that the information provided can be used interchangeably.

What is the difference between blood and interstitial fluid?

The key difference between plasma and interstitial fluid is that the plasma lies within the blood vessels and it is the liquid portion of the blood while the interstitial fluid lies between the cells of the tissues. Another difference between plasma and interstitial fluid is the protein concentration.

Is interstitial glucose higher than blood glucose?

There is a 3–5 mg/mL difference between arterial and venous levels, with higher differences in the postprandial state. Levels are higher in the arterial blood because some of the glucose diffuses from the plasma to interstitial fluid (IF) as blood circulates through the capillary system.

Is interstitial glucose lower than blood glucose?

In the human body, ISF glucose in the cells and in the brain is likely a more relevant physiological parameter than BG values. This would mean that the ISF glucose values are not of lower relevance than the BG values, but rather just the opposite.

What is more accurate CGM or glucometer?

Both finger prick glucometers and CGMs have some error margin. The gold standard for accuracy is a blood draw measurement and both finger sticks and CGMs have error margins (MARD) to that standard. Finger sticks tend to be in the range of 5-10% MARD, while the Libre has a MARD of about 9.4% over 14 days.

What is interstitial fluid and why is it important?

Fluid found in the spaces around cells. It comes from substances that leak out of blood capillaries (the smallest type of blood vessel). It helps bring oxygen and nutrients to cells and to remove waste products from them.

What is interstitial fluid or tissue fluid?

Fluid found in the spaces around cells. It helps bring oxygen and nutrients to cells and to remove waste products from them. As new interstitial fluid is made, it replaces older fluid, which drains towards lymph vessels. When it enters the lymph vessels, it is called lymph. Also called tissue fluid.

Does CGM measure blood glucose?

What does CGM measure? CGM is a tool for people with diabetes. It measures your glucose levels 24 hours a day when you are wearing the device. Insulin is a hormone that helps your body regulate blood sugar levels.

Is blood and interstitial fluid?

The ECF components are: interstitial fluid (fluid between the cells), lymph (fluid that circulates throughout the lymphatic system), and blood.

Why is glucose content higher in tissue fluid than blood?

But when the plasma is forced out of the capillaries at high hydrostatic pressure the tissue fluid then becomes more higher in glucose content than the blood. You are also right in saying the glucose is taking up the glucose for respiration.

How is interstitial fluid related to blood sugar?

Interstitial fluid and blood sugar levels. It is important to note that glucose levels in our blood rise and fall ahead of glucose levels in our interstitial fluid. The glucose level provided by a continuous glucose monitor will experience around a 10 minutes delay compared with the glucose level given by a blood glucose meter. Therefore,…

Where does the glucose in a sensor come from?

Your sensor glucose (SG) readings are taken from your interstitial fluid, and not from your blood, like fingersticks. Interstitial fluid is the fluid that surrounds the cells of your tissue below your skin, and usually glucose moves from your blood vessels and capillaries first and then into your interstitial fluid.

Where does glucose move in the human body?

Interstitial fluid is the fluid that surrounds the cells of your tissue below your skin, and usually glucose moves from your blood vessels and capillaries first and then into your interstitial fluid. It’s helpful to think about it like a rollercoaster where the front car is the blood glucose (BG) and the car in the back is the sensor glucose (SG):