Skip to content
Interactive Resources for Schools
Schools Search Icon

Content

Help and information

This topic takes on average 55 minutes to read.

There are a number of interactive features in this resource:

Topic last updated: 30 Sept 2021

You may also be interested in these related topics

  • Biotechnology
    • Biology
    • PSHE / Citizenship studies
    • Science (applied)
    • 16+

  • Diabetes
    • Biology
    • Human biology
    • Science
    • 14-16
    • Ico Human Biology Human biology
    • Biology Biology
    • Ico Citizenship Studies PSHE / Citizenship studies
    • 16+
    • 55

Diabetes 16+

4  of  10

Diagnosis of diabetes

Type 1 diabetestype 1 diabetes
 Develops when the body does not produce the right amount of insulin or, in some cases, does not produce any at all. It must be treated with daily injections of insulin. People affected also need to manage their diet, eat regularly and plan exercise carefully to balance their energy needs with their food and insulin intake.

The onset of type 1 diabetes is rapid and its symptoms are likely to be noticed through:

  • Excessive thirst
  • Weight loss
  • Drowsiness
  • Coma, in extreme cases
  • Blood glucoseglucose
     A type of sugar: a mono saccharide with 6 carbon atoms (a hexose sugar).     level above 10 millimoles per litre (mmol/l).
  • Muscle cramps
  • Gastrointestinalgastrointestinal
     Relating to the body's digestive system, including the stomach and intestines.      symptoms such as nausea and vomitingvomiting
     The process of forcing food out of the mouth from the stomach when it is irritated or infected.     , abdominal pain and changes in bowel movements
  • Diabetic ketoacidosis (DKA)
  • Polyuria (excessive urine production)
  • Urinary tract infections

 

Type 2 diabetestype 2 diabetes
 The pancreas does produce insulin but cells stop responding properly to insulin. It is often linked to obesity and lack of exercise. Taking more exercise, losing weight and eating a carefully balanced diet can often control or even reverse type 2 diabetes.

This form of diabetes develops much more gradually and so symptoms may not be apparent for many years. It is often diagnosed during healthy screening tests where the blood sugarblood sugar
 The sugar (glucose) dissolved in the blood; the normal range is 4.0 - 7.8 mmol/l. level is found to be elevated despite there being no symptoms of diabetes.

A simple test strip can indicate the presence of glucose in the urine. Image courtesy of: Wellcome Images

Oral Glucoseglucose
 A type of sugar: a mono saccharide with 6 carbon atoms (a hexose sugar). Tolerance Test (OGTT)

Simple blood and urine tests may be sufficient to diagnose diabetes in some people. Others may have to take an oral glucose tolerance test (OGTT) if other blood and urine tests are inconclusive.

Patients are not allowed to eat for at least 12 hours before the test. A blood sample is then taken to measure the patient's fasting blood glucose level.

They are then given a drink containing 75g of glucose. This is quickly absorbed and their blood glucose level is measured over the next two hours.

 

 

Plasma venous glucose concentrationconcentration
 The amount of a substance (solute) in a solution. s used for diagnosis of diabetes:

  Concentration (mmol / l)
  Fasting ≥ 7
  2 hours post-glucose ≥ 11.1
Glucose Test Diagnostic

 

 

Individuals with diabetes rapidly become hyperglycaemic and their blood glucoseglucose
 A type of sugar: a mono saccharide with 6 carbon atoms (a hexose sugar). level remains above normal. Blood glucose in the person with diabetes rises and stays above normal.

Healthy individuals will release insulin to store the excess glucose and return their blood glucose level to normal. The healthy person regulates their glucose back to normal.

Question 3

In the UK, there are significant variations in the frequency of type 2 diabetestype 2 diabetes
 The pancreas does produce insulin but cells stop responding properly to insulin. It is often linked to obesity and lack of exercise. Taking more exercise, losing weight and eating a carefully balanced diet can often control or even reverse type 2 diabetes. between different population groups.

Look at the graph and answer the question.

Rates of diabetes in different ethnic groups in England

 

The graph shows the incidence of diabetes in adults over the age of 16 from different population groups (type 1 plus type 2). Describe the likely factors that influence the different rates of diabetes. Suggest how these factors could be further investigated.

Factors may be:

  • Most groups exhibit greater rates than when the population as a whole is considered.
  • Women are generally less likely to have diabetes than men are. However Pakistani women have a higher rate of diabetes than Pakistani men.
  • Genetic differences are likely to be a major contributing factor. Black Caribbean, Pakistani, Indian and Bangladeshi groups all have high levels of diabetes. Chinese, Black African and Irish are closer to the population average.
  • Diet could play a part, as ethnic groups may have different diets.
  • As families relocate from Asia to Europe, their lifestyle and diet may change to ones that increase the risk of developing diabetes.

Further investigations could include:

  • Genetic screening of families where someone has diabetes could lead to the identification of family members who have genes that make them susceptible to diabetes.
  • Analyse the diets of groups / families that have a higher incidence of diabetes. E.g. what proportions of diet is high in fat, sugar etc. Compare with groups that have a lower incidence.
  • Investigate lifestyle - activity, obesityobesity
     A disorder where an excessive amount of fat has accumulated in the body. It results when the energy taken in as food is stored in the body instead of being used up through activity.     etc.
  • Look at incidence of diabetes in regions where groups originated. Is the incidence of diabetes the same or different? If different, look for differences in diet and lifestyle that could explain the change in incidence.
Previous
Regulating blood glucose levels
Discovery of insulin
Next