What Is a C-Peptide Test?
The test can help your doctor decide whether you need to take insulin to control your condition or to check your dosage if you already take it.
Doctors can use the test whether you have type 1 diabetes when the immune system attacks and destroys cells in the pancreas, or type 2, when your body doesn’t use insulin as well it should.
Where Does C-Peptide Come In?
Beta cells in your pancreas make insulin. During that process, these cells also release C-peptide.
This substance doesn’t actually affect your blood sugar. But your doctor can measure the level of it to help her figure out how much insulin you’re making.
Why Would I Get This Test?
Doctors don’t use it to actually diagnose diabetes, but it can give them a reading to help treat it.
It can tell the difference between insulin your body has made and insulin that you took.
You might get the C-peptide test:
- To find out whether you have type 1 or type 2 diabetes
- When you have type 1 and your doctor needs to know how much insulin your pancreas still makes
- When you have type 2 diabetes and she needs to measure how much insulin you make on you own — or whether you need to begin taking it yet
- To find out why you have low blood sugar (hypoglycemia)
- To diagnose a tumour of the pancreas that releases insulin, called an insulinoma
- If you’ve had your pancreas removed
How to prepare for the C-peptide test?
You might need to stop eating 10 to 12 hours before the test. Sometimes, it’s done after you eat.
Let your doctor know about any medicines you are on. Include medicine you take by prescription and those you buy over the counter, such as herbal supplements or vitamins.
How has C-peptide test Done?
The C-peptide test uses a sample of your blood and result will be available in 24hrs.
What C-peptide results mean?
A normal C-peptide range is 0.5 to 2.0 nanograms per milliliter.
These levels can be high when your body makes more insulin than usual. Levels are low when your body makes less than it normally should.
A high level can mean that you:
- Have insulin resistance — meaning your body doesn’t use it as well as it should
- Have a tumour, called an insulinoma
- Have kidney disease
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