Short answer: DHA’s guideline lists screening and periodic health examination as one of twelve content areas for General Practice. Learn the criteria for a good screening programme, the three levels of prevention, the biases that flatter screening, and how predictive value falls when prevalence is low. Age cut-offs vary by guideline, so use the one in the question.
Where this sits in the exam
The General Practice entry in DHA’s CBT Guideline (cover reads “Updated - Sep 2026”) lists twelve areas with no weights. One is screening and periodic health examination, and another is basic epidemiology and evidence-based medicine concepts. They overlap, which makes this topic efficient to revise. DHA publishes no sample questions, so this is a revision map.
Meddex is independent and is not connected to the Dubai Health Authority (DHA) or Prometric.
This is exam-preparation revision, not clinical advice. In practice, follow your own organisation’s policies and the current guideline, and check every dose and threshold against them.
What makes a good screening programme
The classic criteria are from Wilson and Jungner for the World Health Organization. In short: the condition is an important health problem, there is a recognisable early stage, an accepted treatment exists and is better when started early, the natural history is understood, a suitable and acceptable test exists, the facilities for diagnosis and treatment are available, there is an agreed policy on whom to treat, the cost is balanced against the benefit, and case finding is a continuing process.
Questions often give a scenario and ask which criterion is missing. If a test finds a disease for which no effective treatment exists, the programme fails the criterion about treatment, however accurate the test.
Primary, secondary and tertiary prevention
Primary prevention stops disease before it starts, such as immunisation, smoking cessation and advice on activity. Secondary prevention finds disease early in people without symptoms, which is screening. Tertiary prevention reduces the harm of established disease, such as rehabilitation after a stroke. Learn one example for each and say it aloud.
Test performance and the effect of prevalence
Sensitivity is the share of people with the disease whom the test finds. Specificity is the share of people without it whom the test clears. Positive predictive value, the chance that a positive result is a true positive, depends on prevalence as well.
Example, written by Meddex with invented numbers. A test has sensitivity 90 percent and specificity 90 percent, and 1 in 100 people screened have the disease. Out of 1000 people, 10 have it and the test finds 9. Of the 990 without it, 10 percent, which is 99, test positive wrongly. So 108 people test positive and 9 of them are true, which makes the positive predictive value about 8 in 100. A positive screening result is a reason for a confirmatory test, not a diagnosis.
Biases that make screening look better than it is
Lead-time bias: earlier detection adds time to the survival figure without changing the date of death. Example, written by Meddex: a cancer found by a test at age 60 instead of 63 gives 3 extra years of apparent survival even if death still occurs at age 66. Length-time bias: screening picks up slow-growing disease more often than fast-growing disease. Overdiagnosis: finding disease that would never have caused harm. Healthy-volunteer bias: people who attend screening are often healthier. Randomised trials with mortality as the outcome avoid these problems.
Common screening topics, and why the age is not memorised
Adult screening that appears in general practice teaching includes blood pressure, cholesterol, diabetes in people at risk, cervical screening, breast screening by mammography, colorectal screening, a one-off ultrasound for abdominal aortic aneurysm in older men, and osteoporosis risk assessment in older women. Starting ages, intervals and tests differ between national guidelines. The UAE has its own programmes, and we could not confirm their details, so this guide does not state UAE schedules. When a question gives an age and a guideline, follow it. When it does not, choose the answer that fits the principle.
The periodic health examination
Modern advice favours a risk-based review over a routine yearly check. It covers blood pressure, weight and waist, smoking and alcohol, physical activity, diet, immunisation status, mood and the screening tests due for the person’s age and sex. The World Health Organization advises adults to do at least 150 to 300 minutes of moderate-intensity physical activity a week, and to limit sedentary time. Adult immunisation teaching includes yearly influenza vaccine for those at risk, a tetanus booster at the interval your schedule sets, pneumococcal vaccine for older adults and hepatitis B vaccine for those at risk.
Counselling in a short consultation
A common structure for smoking is ask, advise, assess readiness, assist and arrange follow-up. Keep advice brief, specific and respectful, and agree one small goal. Document it.
How to practise
Write the nine criteria as a list, then invent one condition and test it against them. Do five predictive value calculations with different prevalence figures and watch the positive predictive value change. Then link the topic to biostatistics for EMREE, which uses the same table, and to DHA exam for doctors for the format. Try the question bank once you have the principles.
Frequently asked questions
This article is general educational guidance, not official advice. Exam rules, fees and timelines are set by the Dubai Health Authority and the test provider and can change, so always confirm the latest details on their official channels. Review of Meddex content by named, licensed clinicians is not complete yet. See how we write and check our content.
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