What Blood Test For Diabetes? Diabetic Profile Test List

Blood Test For Diabetes

Laboratory tests are used both to screen for diabetes, and to monitor ongoing management in those with diabetes. Screening blood tests include random blood glucose, fasting blood glucose, oral glucose tolerance test (OGTT), and glycosylated hemoglobin (HbA1c).

Tests for those with diabetes include the HbAlc, which measures the average blood glucose over the previous weeks, giving an indicator of longer-term blood glucose control. Another blood testing may look at levels of blood lipids (fats and cholesterol). Urine testing (eg, microalbuminuria) is used to look for signs of diabetes complications.

Testing For Diabetes

There are a number of tests that may be done to find out if you have diabetes. These include:


A fasting blood glucose level is a measure of how much glucose is in your blood when have not eaten anything for at least 10 hours (check with your doctor or the local laboratory for the number of hours they would like you to fast before the test). The fasting blood test is normally taken first thing in the morning. When you wake up in the morning you visit the laboratory for the test before you have had anything to eat or drink (but you can have a glass or two of plain water while fasting).

A fasting blood glucose level of 7mmol/L or greater is indicative of diabetes. If you have symptoms of diabetes (thirst, tiredness, repeated interactions, and needing to pass urine often) the test should be repeated on another day to confirm the di1agnosis. Fasting blood glucose level is now the recommended test for finding out if you have diabetes.

Pre-diabetes or Impaired Fasting Glycaemia (IFG)

A fasting blood glucose level can tell you other things as well. If your fasting blood glucose level is from 6.1mmol/L to 6.9mmol/L  you may have a condition called impaired fasting glycemia (IGG) or pre-diabetes.  means that the level of glucose in your blood after eating nothing overnight is higher than it is in people without pre-diabetes or IFG, but not as high as in diabetes.

Most doctors will ask you to have a test called an oral glucose tolerance test (OGTT) if fasting blood glucose shows that you have IFG. The oral glucose tolerance test may show that you actually have diabetes or impaired glucose tolerance’ (IGT) instead of IFG.

If your tests show that you have either IFG or IGT you need to take action to manage these conditions. Having either of these conditions means you are more likely to go on to develop diabetes. You are also at higher risk of developing cardiovascular disease, that is, disease of your heart and blood vessels.

If you have IFG or IGT you should

Organize to be checked once a year for diabetes (and at any time that you have symptoms of diabetes). Ask your doctor to put you on an annual recall for this test.

  • Make sure you eat in a healthy way
  • Keep your weight in a healthy range
  • Have your cholesterol checked every year
  • Have your blood pressure checked often
  • Have 20-30 minutes of moderate exercise on most days of the week.

Oral Glucose Tolerance Test (OGTT)

An oral glucose tolerance test is a test where you go to the laboratory before eating anything in the morning. A blood glucose level is taken. Then you will be asked to drink a glass of fluid containing 75 grams of glucose. You stay in the laboratory and another blood glucose level is taken at one hour and two hours after the drink. These blood glucose levels tell you how well your body uses and stores the glucose you have taken in the drink.

You will normally be asked to do an OGTT if your doctor unsure whether you have diabetes or not. This is normal if your fasting blood glucose 1s less than 7mmo1/L but more than6.1mmol/L.

Test For Diabetes Management

Managing your diabetes means managing a number of factors in your life. You can get a good idea of how effective this management is by the results of some of the laboratory tests you have done.

Blood (Or Plasma) Glucose Level

This measures how much glucose you have in your blood at the time the test is taken. A person without diabetes would nearly always have a blood glucose level somewhere between 4 and 7.5 mmol/L (a ‘normal’ blood glucose level).

Blood Glucose Series

This is a series of three tests for blood glucose levels. There are different ways of doing this kind of test but a common way is as follows:

Day one: Have your normal breakfast and medication or insulin. Have your normal mid-morning snack (if you have one) and go to the laboratory for the first blood glucose test before your lunch. Have your usual lunch (and medication or insulin if you take it), then go back to the laboratory 2 hours after lunch and have your second blood glucose test taken. Have your normal food and medication or insulin for the rest of the day.

Day two: Have no insulin, medication, or food when you wake up in the morning. Go to|the laboratory as soon as you can and have your third blood glucose test taken. Once this is done have your medication or insulin and your breakfast. Your blood glucose series is now complete. The aim of such a series is to get a ‘picture’ of your usual blood glucose levels on a close to a normal day.

Healthy Levels for a Blood Glucose Series

Everybody will have different target levels depending on lots of individual factors. You and your doctor need to work out what are realistic and safe target levels for you.

A general guide to targeting levels for a blood glucose series is:

  • Pre-lunch between 4.5 and 7.8mmol/L
  • 2 hours after lunch between 4.5 and 8.5mmol/L
  • First thing in the morning (fasting) between 4 and 6mmol/L.


The HbAlc measures your average blood glucose over the past 4 to 6 weeks (possibly longer). It measures how much glucose is stuck onto your red blood cells. Red blood cells have a lifespan of about 6 weeks and so the test gives a good indication of what your overall blood glucose levels have been through that time.

Most diabetes specialists and GPs have a lot of confidence in this test and will use it to help show you how you are going with your blood glucose management. The HBA1c level is not directly equivalent to blood glucose levels. For example, an HbAlclevel of 13% means that your average blood glucose for the past6 weeks has been around 18-19mmol/L.

Healthy HBA1c Levels

Target HbA1c levels will vary from person to person. Work Out a safe target HbAlc for you with your doctor.
A general range for HbA1c levels |IFCCvalues in square brackets is:

  • Less than or equal to 7% [IFCC value in square brackets] is:
  • Between 7% and 8% [54-64mmol/ mol is a fair HbA1c level and needs work to improve.
  • Between8 % and 10% [65-86mmol/mol] indicate your blood glucose levels are much too high.
  • Above 10% [87mmol/mol or higher] indicates your blood glucose levels are extremely high.

Note: If you are taking insulin and your HbAlc level is less than 6.2% [44mmol/mol] this almost certainly indicates that you are having lots of low blood glucose levels. Having HbA1c levels this low is not safe when you are taking insulin.


This measures your average blood glucose levels over the previous 2 weeks. This measure is not as commonly used in India as HbA1c levels. This is because many people feel HbA1c levels tend to be more accurate and reliable.

Some diabetes services use fructosamine as a useful measure for women who are pregnant. Because insulin needs (and consequently blood glucose levels) change so rapidly during pregnancy, some services prefer to use fructosamine rather than HbAlc as it looks back over a shorter time and therefore may reflect rapid changes more effectively.

Healthy Fructosamine Level

If you are not pregnant, the target healthy level is less than 300. When you are pregnant, the target healthy level is less than 200.

Measuring Blood Fats (Cholesterol or Lipid Levels)
The level of or fats in your blood is measured by a test called a blood lipid profile. This measures the level of a number of different fats in your blood.

Protein in Urine

Small amounts of protein leaking out into your urine is an early sign that your kidneys are developing damage from your diabetes (diabetic nephropathy). The amount of protein leaking into your urine can tell if you have kidney damage and also if it is getting worse or not.

Your microalbuminuria levels should be plotted on a graph over time. Hopefully, these levels will stay low, but if they are rising then this shows there is a problem happening with your kidneys. It is best if your microalbuminuria levels are less than 2.

If your test comes back with raised microscopic protein levels your doctor may ask for you to have the test again. This is because, sometimes, your microalbuminuria levels can be up if you have to have an infection test again or even if you have been exercising hard. If they are up for this reason this is just temporary and not a problem. Repeating the test helps to d eliminate a false positive for either of these reasons.

Thyroid Function

Thyroid Function Test For Diabetes: You may also have your thyroid hormone levels tested (especially if you have type1 diabetes). Checking your thyroid function involves having a sample of blood taken at the laboratory. Some diabetes clinics will check your thyroid function on a fairly regular basis.

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