Pharmacogenomic testing in Australia: what it is, who it helps, what it costs.
Pharmacogenomic testing reads the genes that control how your body processes and responds to medicines. It is done once, because your genes do not change, and it gives the doctor who prescribes for you information to weigh when choosing a medicine or a dose. It is self-pay in Australia, and your prescriber, not the test, makes every decision.
What pharmacogenomics is, in one paragraph
Most medicines are broken down by a small family of liver enzymes, and moved around the body by transporter proteins. The genes that build those enzymes and transporters vary from person to person. Some people carry versions that work slowly, so a standard dose builds up higher than intended. Others carry versions that work very fast, so a standard dose is cleared before it does much. A pharmacogenomic profile reports which version you carry for each gene tested, expressed as a category such as poor, intermediate, normal or rapid metaboliser, and links that category to published prescribing guidance.
You will see two words used for this. Pharmacogenetics usually means looking at one gene at a time, in relation to one medicine. Pharmacogenomics means looking at a panel of genes across many medicines at once. In everyday use, and on most Australian laboratory reports, they are used interchangeably.
The genes commonly tested, and what each affects
A clinically useful panel sticks to genes where the evidence is strong enough to change what a prescriber does. Naming the medicine groups rather than individual medicines is deliberate: which medicine suits you is a decision for the doctor who prescribes it.
| Gene | What it does | What a variant result can mean |
|---|---|---|
| CYP2D6 | A liver enzyme involved in breaking down a large share of commonly prescribed medicines, including many used for mood, pain and nausea | Slow processors can reach higher levels than intended on a standard dose. Very fast processors may get little effect from one. |
| CYP2C19 | A liver enzyme important for several medicines used for mood, stomach acid and blood clotting | Affects whether a standard dose reaches, overshoots or falls short of its intended level. For a few medicines it decides whether the medicine is switched on at all. |
| CYP2C9 | A liver enzyme that clears some anti-inflammatory, diabetes and anticoagulant medicines | Slow processors may need a lower starting dose, which matters most for one class of blood thinner. |
| SLCO1B1 | A transporter that carries some cholesterol-lowering medicines into the liver | Reduced function is linked to higher blood levels and a greater chance of muscle aches at standard doses. |
| VKORC1 | The target enzyme for one class of anticoagulant | Variants change how sensitive you are, so the dose a prescriber starts with may differ. |
| Other actionable genes | Additional genes with established international prescribing guidance | Reported where the result would change the usual advice, according to the laboratory's current panel. |
Results are reported as metaboliser or function categories rather than numeric ranges; your report shows the categories your laboratory uses.
Who tends to benefit, and why it is the doctor's call
Pharmacogenomics is most useful where the answer would actually change something. In practice that means:
- People about to start a medicine in one of the affected groups, because the information is most valuable before the first prescription rather than after.
- People for whom a previous medicine did not work at a usual dose, or caused side effects that others do not get.
- People taking several medicines at once, where interactions and processing speed compound.
- People with a family history of unusual medicine responses, since these gene variants are inherited.
- Anyone who expects to be prescribed medicines over the years, and wants the information on file before it is needed.
It is far less useful as a general curiosity test. Australian specialist bodies regard pharmacogenomic panels as useful in selected situations rather than as a routine test, and the evidence that testing improves outcomes is strongest for a small number of gene and medicine pairs. The panel covers only the genes and medicine groups with established guidance, and genetics is one factor among several. Your condition, your other medicines, your kidney and liver function, your age and weight, and how you have responded before all matter at least as much.
How the test is done, and how long the result lasts
It is a single sample, collected once. At KnowLuna the default is a home swab or saliva kit posted to you with a prepaid return satchel, and you can collect at an accredited (NATA and RCPA) Australian centre instead if you prefer. Either way the sample is analysed by the same accredited laboratory network used for any other pathology. There is no fasting, no cycle timing, and nothing to stop or start beforehand: keep taking every medicine exactly as prescribed, because what you are taking does not change the genetic result. Some medicines can block these enzymes and make you behave like a slower processor than your genes suggest, which is why your prescriber needs your full medicine list when reading the report.
Because it is genetic rather than routine chemistry, the laboratory work takes longer than a blood panel. Allow a few weeks from collection to report.
The result itself does not expire. Your genes will be the same at 70 as they are today, so the profile is done once in a lifetime. Two exceptions are worth knowing: a result from a blood sample is not valid if you have had a bone marrow or stem cell transplant from a donor, and after a liver transplant the enzymes doing the work are the donor's, so tell your doctor if either applies to you. What does change is the guidance layered on top of it, as research adds medicines and refines advice. Keep the report with your health records and show it to any doctor who prescribes for you; they can check the current guidance against your unchanged result.
What it costs in Australia, and where Medicare sits
Broad pharmacogenomic panels are self-pay in Australia. There is no Medicare rebate for a general profile like this one, whoever provides it. Medicare does fund a small number of specific single-gene tests in defined clinical situations, and your treating doctor can arrange one of those separately if it applies to you.
Prices vary between providers, and it is worth checking what is included: some prices cover the laboratory work only, and put the interpretation, or a consultation to explain it, on top.
The KnowLuna pharmacogenomic profile is priced at launch, once our laboratory agreement is signed; waitlist members see the price first. Either pathway applies: bring your own doctor's signed request, or have a KnowLuna doctor request it and explain the result in a 20-minute video consult. Both prices include the report you can download and hand to any prescriber. Doctors are AHPRA-registered and the laboratory is accredited to the Australian standard.
Common questions
What is pharmacogenomic testing?
A genetic test that reads the genes controlling how your body processes and responds to medicines. For each gene it reports a category, for example poor, normal or rapid metaboliser, and links that category to the medicine groups where it changes the usual advice on choice or dose. The doctor who prescribes for you decides what the result means in your situation.
What is the difference between pharmacogenetics and pharmacogenomics?
Pharmacogenetics usually describes looking at a single gene in relation to a single medicine. Pharmacogenomics describes a panel of genes assessed across many medicines at once. The distinction matters less in practice than it used to, and Australian laboratories and doctors often use the two words for the same thing. A consumer profile is almost always the panel version.
Does Medicare pay for pharmacogenomic testing?
Not for a broad panel. A general pharmacogenomic profile is self-pay in Australia, whoever provides it. Medicare does fund a few specific single-gene tests where a defined clinical situation applies, which your treating doctor can arrange if relevant. Ask what a quoted price includes, since some cover the laboratory work only and charge separately for interpretation.
Is pharmacogenomic testing worth it?
It depends on whether the answer would change anything for you. It is most useful before starting a medicine in an affected group, after an unusual response to one, or where several medicines are involved. It is least useful as a general curiosity test, because it covers only the genes and medicine groups with established guidance. Your prescriber is the right person to advise.
How reliable is pharmacogenomic testing?
Genotyping is highly accurate for the variants tested, but panels look for known variants rather than reading the whole gene, so uncommon ones can be missed and a normal result is less certain than a variant result. The prescribing guidance comes from international expert consortia, and Australian specialist bodies regard the panel as useful in selected situations rather than as a routine test, with the outcome evidence strongest for a small number of gene and medicine pairs.
Where is the sample collected?
Wherever suits you. The default is a home swab or saliva kit posted to you, which you return in a prepaid satchel; you can also collect at an accredited Australian centre, the same network your GP's pathology goes through. There is no fasting and no timing to plan around, and it takes a few minutes either way. A swab, saliva and a blood sample all give the same genetic information when processed by an accredited laboratory.
Sources and further reading
- Pathology Tests Explained (RCPA): pharmacogenomics (PGx) testing
- Clinical Pharmacogenetics Implementation Consortium (CPIC): guidelines
- Medical Genetics Summaries (NCBI): pharmacogenomic summaries
- Healthdirect: genetic testing
General information only, not medical advice. If your symptoms are severe or sudden, see a doctor promptly. This page does not replace a consultation with a doctor who knows your history; read our medical disclaimer.
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