By Morgan Helmling, Naturopath, Living Holistic Health — a plain-language guide to nutritional testing for children, and how we work out what is really going on.
If you have ever left an appointment being told your child’s results are normal, while you can still see that something is not right, this article is for you. That gap between the paperwork and the child in front of you is where most of my work begins.
This is the third and final post in our children’s health series. The first looked at vitamin supplements for children, and the second explored how nutrient deficiencies in children can hide behind everyday symptoms.
Both posts ended in the same place, with a promise. Rather than guessing, we test. So here is exactly how we do that, layer by layer.
Nutritional testing for children starts with a conversation
Nutritional testing for children begins with your story
Before I order anything, I want to hear from you. Parents notice the small shifts long before a laboratory does, and that observation is genuinely valuable clinical information.
I ask when things changed, and what has changed since. Furthermore, I ask what a normal day looks like, because context shapes every result that follows.
What I ask about in a first appointment
The questions cover more ground than most families expect. However, each one helps narrow the possibilities.
- Energy through the day, and how your child is at pick-up time
- Sleep, settling, and whether they wake unrefreshed
- Mood, focus, frustration and how they cope at school
- Digestion, appetite, and how food feels for them
- Growth, illness patterns, and any medications
- Birth history, feeding history, and family patterns
As a mother myself, I know how hard it can be to summarise years of small worries in one sitting. Therefore I never expect you to have it all organised beforehand.
What I look for in the room
Physical signs are the oldest form of nutritional testing for children
Long before laboratories existed, nutritional status was read from the body. In clinic I still use a structured deficiency chart to check the tissues that turn over fastest.
Consequently, I look at the mouth, skin, nails, hair and eyes. Cracked lip corners, a sore or pale tongue, brittle or spoon-shaped nails, dry rough patches on the arms and thinning hair all earn a closer look.
Why these signs are a starting point, not an answer
I want to be honest about the limits here. A physical sign points toward a possibility, but it rarely confirms one on its own.
For example, brittle nails appear alongside low iron, low calcium, low biotin and several other patterns. As a result, physical assessment tells me where to look next rather than what to treat.
Growth charts show the trend over time
A single measurement means very little. A trend, on the other hand, means a great deal.
I plot height, weight and head circumference where relevant, then look at the shape of the line. Notably, a child who has drifted down across percentiles tells a different story from one who has always tracked steadily along the same curve.
What school reports add to nutritional testing for children
This one surprises parents, so I explain it carefully. School reports and teacher feedback are an outside observer’s record of your child’s concentration, stamina and mood over months.
That matters because nutrition affects attention and energy. According to PubMed, a scoping review of thirty studies found that twenty-two showed an association between iron status and attention difficulties. Therefore a comment such as “tires by the afternoon” or “struggles to stay on task” becomes useful clinical data rather than just a school note.
Assessing what actually goes in
Diet diaries, used with care
I usually ask for a few days of food records. Meanwhile, I am careful about how much weight I place on them.
According to PubMed, a systematic review comparing dietary assessment methods against doubly labelled water found under-reporting in every included study. Interestingly, the same review found that a diet history interview and a twenty-four-hour recall performed best when a parent, or a parent and child together, were the reporters. That is precisely why I take a food history by talking with you rather than only reading a form.
Comparing intake against age-based targets
This is a step that self-prescribing at the pharmacy always skips. Children have their own nutrient reference values, and they change with every age band.
I compare estimated intake against the Australian Nutrient Reference Values for your child’s exact age group. Additionally, I check intake against the upper level, which is the point above which harm becomes more likely.
Why upper limits matter so much in children
The upper levels for children are far lower than most parents realise. A one to three year old, for instance, has an iron upper level of twenty milligrams and a zinc upper level of seven milligrams.
Those numbers are a fraction of the adult figures. Consequently, a supplement scaled for an adult body can push a small child past a safe ceiling surprisingly quickly.
Standard pathology is the essential next layer
Standard bloods are the backbone of nutritional testing for children
I want to be clear that I am a strong advocate for standard pathology. It is affordable, widely available and often bulk billed through your GP.
A full blood count, iron studies, vitamin B12, folate, vitamin D, thyroid function and coeliac serology will answer most questions. In other words, this layer resolves the majority of cases before anything else is needed.
Why ferritin can look normal when iron is genuinely low
Here is a limitation worth understanding. Ferritin rises during infection and inflammation, which means it can read as reassuring in a child who is unwell or fighting frequent bugs.
According to PubMed, researchers in a trial involving five hundred and seventy-four Mexican school children found iron deficiency in 11.3% of children using unadjusted ferritin. After adjusting for inflammation, that figure rose to 15.9%. Similarly, the wider BRINDA project concluded that inflammation is so common that it must be measured for micronutrient results to be interpreted correctly.
Why adult reference ranges can mislead in children
Reference ranges are built from populations, and most were built from adults. That is a genuine problem in paediatrics.
According to PubMed, Dutch researchers measuring three vitamin B12 markers in one hundred and seventy children aged nought to eighteen found that levels vary substantially with age. Crucially, they concluded that a large proportion of mainly young children would be misclassified if adult reference values were applied.
This is why interpretation matters as much as the test itself. A number inside a range is not automatically a number that is right for your child.
Where functional nutritional testing for children adds real insight
Standard bloods tell us how much of a nutrient is circulating. Functional testing asks a different and, I think, more interesting question. Is that nutrient actually doing its job inside the cells?
Organic acids: nutritional testing for children from one urine sample
This is the functional test I reach for most often in children, and the collection is the reason. It needs a urine sample taken at home, with no needle and no fasting.
The laboratory measures dozens of metabolites, which are the by-products your child’s cells leave behind as they make energy and process nutrients. According to PubMed, this approach has been used in paediatric research, including an Australian-led study analysing thirty-four urinary organic acids in seventy-two asthmatic children aged five to twelve.
What this tells us that a blood test cannot
Blood tells us how much of a nutrient is present. This tells us whether your child’s body is actually managing to use it.
That distinction matters enormously in practice. Consequently, when a child has normal bloods but still runs flat, this is often where the explanation finally appears, and it gives us something specific to act on rather than another dead end.
What nutritional testing for children shows about the B group
The B vitamins are the ones I most often want a functional read on. Each of them carries its own marker, so we are not left guessing from a single blood level.
Together they show whether B1, B2, B3, B5, B6, B12, folate and biotin are genuinely keeping up with demand. Consequently, if a child needs support we know which one, and we can leave the rest alone.
Whether your child is getting enough protein
Protein is easy to under-eat during fussy years, and it is hard to judge from a food diary alone. The panel reads how your child is breaking down and using amino acids, which are the building blocks that protein provides.
Separate markers reflect meat and fish intake directly. As a result, we get an honest picture of whether protein is keeping up with a growing body, rather than an estimate.
How much fruit, vegetables and polyphenols are getting in
This one genuinely surprises parents. The panel picks up plant compounds and polyphenols, which are the colourful protective molecules found in fruit, vegetables, berries and herbs.
Low readings suggest plant intake is thinner than the food history implied. Interestingly, these markers also depend on gut bacteria doing the converting, so a low result can point to the microbiome rather than the shopping trolley.
Either way, it is useful. Instead of a vague suggestion to eat more vegetables, we learn whether the issue is intake, absorption, or a bit of both.
Everyday environmental exposures
The panel also flags markers linked to common household and traffic-related chemicals, alongside a marker of oxidative wear. Nothing here is a diagnosis, and I am always careful to say so.
What it does is start a practical conversation. Sometimes the useful change is as simple as better ventilation, a different cleaning product, or airing out a newly furnished room.
Energy and mood, read side by side
The same sample shows how well your child is producing energy, alongside how their stress and mood chemistry is tracking.
For a tired and irritable child, that pairing is genuinely useful. Instead of treating low energy and low mood as two separate problems, we can see whether one is driving the other, which usually makes the plan simpler rather than bigger.
Clues about the gut, from the same sample
The panel also picks up signals from gut bacteria and yeasts. Helpfully, we do not need a second collection to get them.
That matters because absorption sits upstream of everything else. As I wrote in the previous post, a nutrient that never gets absorbed will never show up where it is needed, no matter how good the diet looks on paper.
Hair mineral analysis: painless nutritional testing for children
For many children, this is the easiest test of all. We take a small snip of hair from underneath, where it will not be seen.
Its value is the longer view. Because hair grows over months, it reflects a stretch of time rather than a single morning, and it also flags exposure to elements we would rather your child was not accumulating.
Being honest about what hair analysis can and cannot do
I always explain the limits of this one before we run it. Hair is well established for screening environmental exposure to elements such as lead and mercury, and according to PubMed it has been used exactly that way in studies of school children.
For nutritional minerals, however, hair is a supporting clue rather than a diagnosis. Consequently I read it alongside bloods and diet, never on its own, and I never treat from a hair result in isolation.
DNA and nutrigenomic testing, used gently
We do offer nutrigenomic testing, and it is a simple cheek swab. Importantly, we are not screening your child for diseases.
What we are looking at is function. Broadly, it covers how a body may process nutrients and fats, and how pathways such as methylation, detoxification and neurotransmitter production are supported. Consequently, it helps us prioritise the diet and decide which nutrients deserve attention first.
Your genes are not your destiny
This is the part I most want families to hear. Genes describe tendencies rather than certainties, and this testing does not diagnose anything.
A variant is really an insight into how your child can eat, move, sleep and live in order to make the most of their own potential. Meanwhile, those daily choices still do most of the work, which is why we read genetics alongside every other layer rather than on its own.
In other words, the report is not a verdict. Instead, it is a set of clues about where a little extra support may go further for this particular child.
The two areas that touch on risk
Two parts of the panel do relate to risk, and I explain both openly with families. The first is the coeliac group, HLA-DQ2 and HLA-DQ8.
Coeliac disease develops almost only in people carrying one of these. According to PubMed, in a Swedish study of 2,035 children, all but one of those later diagnosed with coeliac disease carried HLA-DQ2 or DQ8. Helpfully, a negative result is often the more useful one, because it makes coeliac very unlikely.
Carrying the gene, on the other hand, is common, and most carriers never develop the condition. Therefore a positive result is a reason to stay aware and to test properly if symptoms appear, not a diagnosis in itself.
The second is APOE, which we read mainly for how a body handles dietary fats. Accordingly, it helps guide how much emphasis we place on omega-3s and fat quality when we build the plan.
Our point of difference is how the layers fit together
Why nutritional testing for children works in layers
The real skill is not ordering tests. It is reading five layers of information together and finding where they agree.
When the story, the physical signs, the growth trend, the diet analysis and the pathology all point the same way, I can be confident. Conversely, when they disagree, that disagreement is usually the most useful clue we have.
We test to change the plan, not to fill a folder
Before ordering anything I ask myself one question. Will this result change what I actually do?
If the answer is no, we do not run it. Additionally, this is why I often start with standard pathology through your GP and only add functional testing when the picture stays unclear.
Precision means smaller, more targeted plans
Better information does not mean longer prescriptions. In practice, it usually means the opposite.
Knowing which nutrient is short lets us correct that one properly, at the right dose and form for your child’s age and weight. Meanwhile, we can leave everything else alone and let food do the rest of the work.
Working alongside your GP and paediatrician
None of this replaces medical care, and it is not meant to. Your GP and paediatrician diagnose and manage, and they order the standard pathology that answers most of these questions.
My role sits beside theirs, in interpretation, dietary strategy, dosing and follow-through. Everyone does better when both sides know exactly what your child is taking.
What happens when you book in
Your first appointment is a long conversation, not a rushed one. We go through the history, the timeline and your worries, and I examine the physical signs described above.
From there, I explain what I think is going on and what testing would add. Importantly, you decide what to proceed with, and I will always tell you when the answer is that no further testing is needed.
If you are ready to stop guessing, you are welcome to book an appointment at our Geelong or Drysdale clinics, or by telehealth anywhere in Australia. Bring your child’s most recent blood results and any supplements they are taking, and we will start from there.
Frequently Asked Questions
Does my child need a blood test to start?
Not always, and not on day one. We begin with history, physical signs, growth and diet, which often points clearly enough to act on. Where bloods are warranted, your GP is usually the best and most affordable place to arrange them.
Is functional nutritional testing for children safe and comfortable?
The two we use most in kids are a urine sample and a small snip of hair, so neither involves a needle. Both can be collected at home, in your own time, which removes most of the stress for children who find appointments hard.
Why not just do every test available?
Because more data is not the same as better care. Every test should earn its place by changing the treatment plan, and testing without a clear question tends to produce findings that worry families without helping them.
My child’s results were normal. Why do they still feel unwell?
This is one of the most common reasons families come to see me. Reference ranges are wide, many were built from adults, and results can be affected by inflammation. Normal means nothing was flagged, not that everything is optimal.
How much does nutritional testing for children cost?
Standard pathology through your GP is often bulk billed or low cost. Functional tests are privately funded and vary by panel, so I always discuss the cost with you before ordering anything and never proceed without your agreement.
How long before we see results from a plan?
Symptoms often start shifting within a few weeks, whereas rebuilding stores takes longer, particularly with iron. We usually retest at an appropriate interval so we know when the job is genuinely done.
References
Standard pathology in nutritional testing for children
- Heiner-Fokkema MR, Riphagen IJ, Wiersema NS, et al. Age dependency of plasma vitamin B12 status markers in Dutch children and adolescents. Pediatr Res. 2021. https://doi.org/10.1038/s41390-021-01372-2
- Finkelstein JL, Mehta S, Villalpando S, et al. A Randomized Feeding Trial of Iron-Biofortified Beans on School Children in Mexico. Nutrients. 2019. https://doi.org/10.3390/nu11020381
- Stoltzfus RJ, Klemm R. Research, policy, and programmatic considerations from the BRINDA project. Am J Clin Nutr. 2017. https://doi.org/10.3945/ajcn.116.142372
- Gosdin L, Sharma AJ, Suchdev PS, et al. Limits of Detection in Acute-Phase Protein Biomarkers Affect Inflammation Correction of Serum Ferritin. J Nutr. 2022. https://doi.org/10.1093/jn/nxac035
Diet and intake in nutritional testing for children
- Walker JL, Ardouin S, Burrows T. The validity of dietary assessment methods to accurately measure energy intake in children and adolescents. Eur J Clin Nutr. 2017. https://doi.org/10.1038/s41430-017-0029-2
- National Health and Medical Research Council. Nutrient Reference Values for Australia and New Zealand. https://www.nrv.gov.au/nutrients
- Fayet-Moore F, McConnell A, Kim J, Mathias KC. Identifying Eating Occasion-Based Opportunities to Improve the Overall Diets of Australian Adolescents. Nutrients. 2017. https://doi.org/10.3390/nu9060608
Functional nutritional testing for children: methods
- Papamichael MM, Katsardis C, Erbas B, Itsiopoulos C, Tsoukalas D. Urinary organic acids as biomarkers in the assessment of pulmonary function in children with asthma. Nutr Res. 2018. https://doi.org/10.1016/j.nutres.2018.10.004
- Drobyshev EJ, Solovyev ND, Ivanenko NB, Kombarova MY, Ganeev AA. Trace element biomonitoring in hair of school children from a polluted area by sector field inductively coupled plasma mass spectrometry. J Trace Elem Med Biol. 2016. https://doi.org/10.1016/j.jtemb.2016.07.004
Nutrients and childhood symptoms
- McWilliams S, Singh I, Leung W, Stockler S, Ipsiroglu OS. Iron deficiency and common neurodevelopmental disorders—A scoping review. PLoS One. 2022. https://doi.org/10.1371/journal.pone.0273819
- Leung AKC, Lam JM, Wong AHC, Hon KL, Li X. Iron Deficiency Anemia: An Updated Review. Curr Pediatr Rev. 2024. https://doi.org/10.2174/1573396320666230727102042
- Bellini T, Bustaffa M, Tubino B, et al. Acquired and Inherited Zinc Deficiency-Related Diseases in Children. Pediatr Rep. 2024. https://doi.org/10.3390/pediatric16030051
- Stiles LI, Ferrao K, Mehta KJ. Role of zinc in health and disease. Clin Exp Med. 2024. https://doi.org/10.1007/s10238-024-01302-6
- Horton-French K, Dunlop E, Lucas RM, Pereira G, Black LJ. Prevalence and predictors of vitamin D deficiency in a nationally representative sample of Australian adolescents and young adults. Eur J Clin Nutr. 2021. https://doi.org/10.1038/s41430-021-00880-y
- Sahin Y. Celiac disease in children: A review of the literature. World J Clin Pediatr. 2021. https://doi.org/10.5409/wjcp.v10.i4.53
- Cerqueiro Bybrant M, Udén E, Frederiksen F, et al. Celiac disease can be predicted by high levels of tissue transglutaminase antibodies in children and adolescents with type 1 diabetes. Pediatr Diabetes. 2021. https://doi.org/10.1111/pedi.13165
Research citations sourced via PubMed. This article is general information only and is not personal health advice. Please speak with your GP, paediatrician or a qualified naturopath before starting, changing or stopping anything for your child.
