When your child is unwell, you may want as many tests as possible to find an answer. Sometimes further testing is helpful, but your paediatrician will choose tests based on your child’s symptoms, age and how the results might affect their diagnosis, treatment or follow-up.
More tests do not always mean better care. Your paediatrician will consider whether a test is necessary, what it is looking for and whether the benefits outweigh any discomfort or risks for your child.
Why Don’t More Tests Automatically Mean Better Care?
You may feel that more tests will give you a clearer answer, but a test is most useful when your paediatrician has a specific question to answer. If your child has been tired for several weeks, for example, they may need certain targeted blood tests, but testing everything at once will not necessarily provide more useful information.
Your paediatrician will look at your child’s symptoms, history and examination before deciding which tests your child may need. The aim is to give you useful answers and help you understand what should happen next, rather than simply giving you more test results.
UK Guidance Note
The RCPCH identifies unnecessary investigations, procedures and treatments as an important paediatric patient-safety risk. Good paediatric care therefore aims to balance doing enough investigation to identify important problems with avoiding tests that are unlikely to benefit your child. Decisions should be guided by your child’s symptoms, examination, age and the clinical question being investigated.
How Does a Paediatrician Decide Which Tests Your Child Needs?
Before your child has any tests, your paediatrician will ask you about their symptoms, medical history, growth, development and how the problem affects daily life. Your child’s age and examination can also help your paediatrician narrow down the possible causes.
Your paediatrician can then choose tests that help make particular conditions more or less likely, confirm certain diagnoses where appropriate or guide the next steps in your child’s care. You can ask what each test is looking for and how the result could change your child’s care.
Why Are the History and Examination So Important Before Testing?
You may feel that your child needs more tests, but a detailed conversation and examination can be just as important. When you tell your paediatrician when symptoms happen, what triggers them and how they affect your child, you can provide clues that a blood test or scan cannot.
Your paediatrician may also learn a lot by watching how your child walks, plays, communicates and responds during the examination. Once you and your paediatrician have a clearer picture, they can decide which tests, if any, your child actually needs.
Are Blood Tests Completely Harmless?
Blood tests are generally safe and can provide useful information, but they are not completely free from discomfort or other drawbacks. Your child may experience fear or discomfort, and repeated blood tests can sometimes make future healthcare more stressful.
Your paediatrician also needs to interpret the results using the correct age-specific range. A slightly unusual result does not always mean your child is unwell, so your paediatrician will consider the result alongside your child’s symptoms and overall health.
Why Can a Healthy Child Have an “Abnormal” Test Result?
You may see a test result flagged as unusual, but this does not always mean your child is unwell. Your paediatrician will check whether the correct age-specific range was used and whether the result fits your child’s symptoms.
When your child has several tests, one or more results may fall slightly outside the reference range by chance, even when they are otherwise healthy. Your paediatrician can explain whether your child needs a repeat test, monitoring or further investigation.
Can Too Much Testing Lead to More Testing?
You may hope that more tests will give you more answers, but an unexpected result can sometimes create new worries for you and your child. Your paediatrician may then need to repeat tests or arrange further investigations to check whether the result is important.
Testing may sometimes identify a genuine problem, but an isolated unexpected result can also reflect normal variation. Your paediatrician will therefore consider whether a test is likely to provide useful information that could affect your child’s assessment or care before recommending it.
Evidence Note
The European Academy of Paediatrics has highlighted overtesting and overtreatment as potential sources of harm in children’s healthcare. Unnecessary investigations may create discomfort, expose children to avoidable procedures or produce unexpected findings that lead to further testing. The aim is not to minimise investigation, but to use the right test when it has a clear clinical purpose.
Do Normal Test Results Mean There Is Nothing Wrong?
You may feel that normal test results should give you a clear answer, but they usually only make certain conditions less likely. Your paediatrician will interpret the results alongside your child’s symptoms, examination and overall health.
If your child is well, growing normally and improving, you may be advised to monitor their symptoms. If symptoms continue, worsen or change, your paediatrician can decide whether further investigation is needed.
Why Might a Paediatrician Avoid Repeating a Test?
You may wonder whether your child needs the same test again, but repeating it is not always necessary. If you bring your child’s previous test results, scans and clinic letters, your paediatrician can see what has already been checked and avoid unnecessary duplication.
Your child may need a repeat test if their symptoms have changed, an earlier result was unclear or the test is needed to monitor treatment. Your paediatrician should consider what useful new information the repeat test could provide about your child’s health or treatment.
What Should You Ask Before Your Child Has Another Test?
You should feel comfortable asking why a particular test is being recommended for your child and what information it may provide. Understanding the purpose of the investigation can help you know what to expect and how the result may affect the next stage of your child’s care.
- What Is the Test Looking For: You can ask which condition or concern the test is intended to investigate and what the result could make more or less likely.
- How Could the Result Change Care: Ask whether a normal or abnormal result would affect your child’s treatment, monitoring or need for further investigation.
- Does the Test Have Any Risks: You can discuss possible discomfort, radiation exposure or other practical considerations before the investigation.
- Is Another Test More Suitable: If imaging is needed, you can ask whether another investigation could answer the same clinical question without ionising radiation or with different practical considerations, where appropriate.
- Has This Test Already Been Done: Bringing previous results, scans and clinic letters can help your paediatrician avoid unnecessary repeat investigations.
Asking these questions can help you understand why each investigation is being considered rather than feeling that more testing is automatically better. Your paediatrician can then focus on tests that are most likely to provide useful information and support the right next step for your child.
Does Your Child Need a Scan Whenever Symptoms Persist?
You may think your child needs a scan if symptoms continue, but different scans answer different questions. Ultrasound and MRI do not use ionising radiation, while CT scans and standard X-rays do.
Your child does not always need the most detailed imaging test. Your paediatrician will choose the investigation that is most likely to answer the clinical question while avoiding unnecessary tests or risks.
Why Does Radiation Matter When Children Need Imaging?
You may worry about radiation if your child needs an X-ray or CT scan, but you should not avoid a necessary test. Your paediatrician will consider whether the scan will give you useful information and whether an appropriate alternative that does not use ionising radiation could answer the same clinical question.
When imaging that uses ionising radiation is clinically justified, its expected benefit should outweigh the radiation risk and the exposure should be optimised for the child’s size and the clinical purpose of the examination. The aim is to avoid unnecessary imaging while ensuring that useful investigations are not delayed when they are needed.
Are MRI and Ultrasound Always the Right Alternatives?
You may prefer an MRI or ultrasound because they do not use radiation, but that does not mean they are always the right choice for your child. Your paediatrician will consider which scan is most appropriate for the clinical question being investigated.
MRI can also be difficult for younger children because they need to stay still in a noisy scanner. Your child may sometimes need sedation or a general anaesthetic, so your paediatrician will weigh the benefits and practical considerations before recommending it.
What Should Be Considered With Different Tests?
| Type of investigation | Important considerations |
| Blood tests | Can answer specific clinical questions but may cause discomfort or distress, and results need age-appropriate interpretation. |
| X-rays and CT scans | Can provide important diagnostic information but use ionising radiation, so the investigation should be clinically justified and the radiation exposure appropriately optimised. |
| MRI | Does not use ionising radiation but takes longer and requires the child to remain still; some children may need sedation or anaesthetic support. |
| Ultrasound | Does not use ionising radiation and can be very useful, but it cannot answer every clinical question. |
| Repeat tests | May be appropriate when symptoms or treatment change, but unnecessary duplication should be avoided. |
Can Observation Really Be Better Than Another Test?
You may sometimes be asked to monitor your child’s symptoms instead of having immediate tests. This staged approach can help focus further investigation while avoiding tests that are unlikely to provide useful additional information.
You should know what to watch for, when your child will be reviewed and which changes mean you should seek help sooner. With a clear plan, monitoring becomes an active part of your child’s diagnosis rather than simply waiting.
Why Are Investigations Sometimes Done in Stages?
Your child may not need every possible test at once. Your paediatrician can start with the investigations most likely to help your child and only move to more specialised tests if they are needed.
If your child’s first results are reassuring but symptoms continue, you can then discuss the next step with your paediatrician. This staged approach can help you get the right answers while avoiding unnecessary tests.
When Might Further Tests Be Necessary?
You should not avoid necessary tests just because unnecessary testing can have drawbacks. Further testing may be appropriate when your child’s assessment identifies concerning features, significant deterioration, persistent symptoms that need explanation or a need to monitor a known condition or treatment.
Your child’s previous normal results do not rule out a condition developing later. You should know which changes mean your child needs another medical review.
Can Specialist Assessment Help Target Testing?
Sometimes, your child may benefit from specialist assessment when their symptoms clearly involve a particular area of health. A specialist can help decide which tests, if any, are most appropriate for your child’s particular clinical problem.
If your child’s symptoms are broad or unclear, a general paediatric assessment may be a more appropriate starting point. A general paediatrician can help decide whether your child needs tests, treatment or a specialist referral, so you can focus on finding the right answers rather than having unnecessary investigations.
Myth vs Fact
| Myth | Fact |
| More tests always mean more thorough paediatric care. | No. The most useful tests are those that answer a clear clinical question and may affect your child’s care. |
| A flagged blood result always means something is wrong. | No. Results need to be interpreted using appropriate paediatric reference ranges and alongside your child’s clinical picture. |
| Normal test results mean your child’s symptoms cannot have a medical cause. | No. Normal results may make certain conditions less likely without explaining every symptom. |
| CT, MRI and ultrasound are interchangeable. | No. Different imaging tests answer different questions and have different practical considerations. |
| MRI has no drawbacks because it does not use radiation. | No. MRI does not use ionising radiation, but some children may struggle to remain still and may occasionally need sedation. |
| Observation means nothing is being done. | No. Planned monitoring with clear safety-netting can provide useful information and may avoid unnecessary investigations. |
Key Takeaways
- More investigations do not automatically mean better paediatric care.
- Tests are most useful when they answer a specific clinical question and may change management.
- Children’s blood results need to be interpreted using age-appropriate reference ranges.
- Unexpected results can sometimes lead to repeat testing even when they represent normal variation.
- Imaging that uses ionising radiation should be clinically justified and appropriately optimised for children.
- MRI and ultrasound avoid ionising radiation but are not interchangeable with every other scan.
- Observation and staged investigation can be active parts of good paediatric care.
- Further testing remains important when your child’s clinical assessment shows that it is needed.
Frequently Asked Questions
1. Do More Tests Mean Better Care for Your Child?
Not necessarily. The most useful tests are those that answer a specific clinical question and could change your child’s care.
2. What information can help your paediatrician decide whether another test is needed?
Bring details of your child’s symptoms, relevant previous results, clinic letters and an up-to-date medicines list where appropriate. Tell the paediatrician whether the symptoms have changed since earlier tests and how they are affecting your child’s everyday life.
3. How can you prepare your child for a blood test?
Explain the test in a way that suits your child’s age and avoid promising that it will not hurt. You can ask the healthcare team what preparation is recommended and whether distraction, numbing options or other support may help your child cope with the procedure.
4. Can Your Child Have an Abnormal Test Result and Still Be Healthy?
Yes. A slightly unusual result does not always mean your child is unwell. Your paediatrician will interpret it using the correct age-specific range and alongside your child’s symptoms and overall health.
5. What should you ask if one of your child’s results is slightly outside the reference range?
Ask whether the correct age-specific reference range has been used, whether the result fits your child’s symptoms and whether it is clinically significant. Your paediatrician can explain whether monitoring, repeating the test or further investigation is actually necessary.
6. Do Normal Test Results Mean Nothing Is Wrong With Your Child?
Not always. Normal results can make certain conditions less likely, but your paediatrician will also consider your child’s symptoms, examination and how their condition changes over time.
7. Does Your Child Always Need a Scan if Symptoms Continue?
No. Different scans answer different questions, so your paediatrician will choose the investigation most likely to provide useful information while considering the benefits, limitations and any relevant risks of the available options.
8. When can repeating a test be useful for your child?
Repeating a test may be useful if your child’s symptoms have changed, an earlier result was unclear or the test is being used to monitor a condition or treatment. The important question is whether repeating it is likely to provide useful new information.
9. Can Monitoring Your Child Be Better Than Having Another Test?
Sometimes. If your child is otherwise well, monitoring can help show whether symptoms improve, return or develop a clearer pattern, provided you know what changes to look for and when to seek further help.
10. How can you help avoid unnecessary repeat tests when seeing another doctor?
Bring relevant previous blood-test results, imaging reports, clinic letters and an up-to-date medicines list where available. This can help the clinician understand what has already been investigated and decide whether anything genuinely needs repeating.
Final Thoughts: Choosing the Right Tests for Your Child
More tests do not always mean better paediatric care. You can work with your paediatrician to understand what each test is looking for, how the result could change your child’s care and whether further investigation is really needed.
If you’re looking for a paediatrician in London, you can get in touch with our team at London Paediatric Clinic. A careful assessment can help identify which tests may be most useful for your child, rather than simply carrying out more investigations.
References:
- Royal College of Paediatrics and Child Health (RCPCH) (no date) Patient safety fundamentals. Available at: https://safety.rcpch.ac.uk/fundamentals
- Størdal, K., Wyder, C., Trobisch, A., Grossman, Z. and Hadjipanayis, A. (2019) ‘Overtesting and overtreatment—statement from the European Academy of Paediatrics (EAP)’, European Journal of Pediatrics, 178(12), pp. 1923–1927. Available at: https://pubmed.ncbi.nlm.nih.gov/31506723
- Adeli, K., Higgins, V., Trajcevski, K. and Palmert, M.R. (2018) ‘Important considerations for interpreting biochemical tests in children’, BMJ, 361, k1950. Available at: https://www.bmj.com/content/361/bmj.k1950
- World Health Organization (WHO) (2016) Communicating radiation risks in paediatric imaging: Information to support healthcare discussions about benefit and risk. Available at: https://www.who.int/publications/i/item/978924151034
- National Institute for Health and Care Excellence (NICE) (2010) Sedation in under 19s: using sedation for diagnostic and therapeutic procedures. Clinical guideline CG112. Available at: https://www.nice.org.uk/guidance/cg112