Overview
Quick answer
There is no official Australian interval for "blood tests" as a bundle. The RACGP Red Book tells GPs when to screen for specific conditions in asymptomatic people. It does not recommend a yearly comprehensive panel for a well adult.
Where colleges do name a gap, the gaps disagree with each other on purpose. Low cardiovascular risk is reassessed within five years. Intermediate risk is reassessed within two years. A diagnostic HbA1c in a high-risk adult without diabetes is funded once every 12 months. Established diabetes is usually monitored every three months, or every six months when stable. A Kidney Health Check is every one to two years if you are at risk, and annually if you have diabetes, hypertension, or are a First Nations adult.
An annual baseline plus a six-month metabolic retest is a preventative-membership model, not a Red Book rule. Hemexa uses that model and labels it as company policy. The useful question is which marker you are talking about, and whether you are screening, monitoring a condition, or tracking a change you made.
Overview
Key takeaways
A health check and a blood test are not the same request. RACGP preventive care is condition-specific. It is not a standing order for a full chemistry and hormone panel.
healthdirect still writes lipid testing every five years from age 45 (from 35 for Aboriginal and Torres Strait Islander people). That matches the 2023 guideline's low-risk reassessment window. Intermediate five-year risk is two years, not five.
Diabetes screening starts with AUSDRISK every three years from age 40 in the general population. Blood testing follows a high-risk score. Aboriginal and Torres Strait Islander people are screened with a blood test annually from age 18.
HbA1c has a biological floor: red cells live about 100 to 120 days, and the result is weighted toward the most recent four to eight weeks. Testing it every few weeks does not give a new average.
A second result is only a change if it exceeds analytical plus within-person biological variation. Pathologists call that the reference change value. A small move inside that band is noise.
Lipoprotein(a) is the opposite case. ESC/EAS say measure it at least once in adult life. The Australian Atherosclerosis Society recommends selective testing, not universal population screening.
Medicare frequency caps are billing rules, not clinical optima. Item 66841 funds one diagnostic HbA1c per 12 months. Item 66551 funds at most four monitoring tests per 12 months in established diabetes.
Hemexa draws the 76–80 marker annual baseline, then repeats 12 faster-moving metabolic and lipid markers at six months. That split is Hemexa policy, not college consensus.
The question
There is no single national interval
Most Australian pages that rank for this query collapse three different jobs into one sentence: a GP health check, a condition-specific screen, and a private preventative panel. Those jobs have different clocks.
The Red Book is not a blood-test calendar
The RACGP Guidelines for preventive activities in general practice (the Red Book) apply to asymptomatic, mostly low-risk people. They tell a GP when to assess cardiovascular risk, diabetes risk, blood pressure, and a short list of cancers. They do not publish a national schedule for ferritin, a full blood count, liver enzymes, thyroid hormones, or a 40-marker panel.
Screening, monitoring, and tracking are different clocks
Screening asks whether a well person has crossed a decision limit. Monitoring asks whether a known condition is still inside a treatment target. Tracking asks whether a change you made (diet, training, a supplement, a medicine) moved a marker. A five-year lipid reassessment and a three-month HbA1c in diabetes can both be correct for the same person, because they answer different questions.
Clinic cadence is not consensus
Memberships and longevity clinics often use annual plus mid-year. That is a product design that matches how fast some metabolic markers can move. It is not an RACGP, ADS, or Heart Foundation recommendation for well adults. The honest page names the official gaps first, then the product model.
If a page answers "how often" with a single number and no condition, it is selling a habit, not quoting a college.
Official clocks
What Australian colleges actually recommend
These are the Australian intervals that can be named from a primary source. They are not a shopping list. Your own GP still decides what is indicated for you.
Cardiovascular risk and lipids
The 2023 Australian CVD-risk guideline, Heart Foundation-led and RACGP-endorsed, assesses people aged 45 to 79, people with diabetes from 35, and First Nations people from 30. Reassess low five-year risk (under 5%) within five years. Reassess intermediate risk (5% to under 10%) within two years if you are not already on risk-reducing medicine. Formal calculator reassessment is not generally required once risk is high (10% or above). First Nations people: every year as part of an annual health check, or at least every two years. healthdirect's "every five years from 45" line is the low-risk public version of that table, not the whole table.
Diabetes screening and prediabetes
RACGP: assess diabetes risk with AUSDRISK every three years from age 40 if you have no specific risk factors. A high score (12 or above, or the other listed high-risk settings) is what triggers a blood test, not the birthday. Aboriginal and Torres Strait Islander people: annual blood testing (fasting glucose, random venous glucose, or HbA1c) from age 18. The 2020 ADS-endorsed prediabetes statement recommends annual HbA1c once prediabetes is identified, and says that interval is supported by Medicare.
Established diabetes: HbA1c
The RACGP type 2 diabetes handbook (glucose-monitoring chapter, recommended as of 14 November 2024) says monitoring is usually recommended at three-month intervals, and that a six-month interval may be appropriate when diabetes is stable. Medicare item 66551 funds monitoring in established diabetes at most four times in 12 months (note PR.2.2). That cap matches four quarterly tests. It is a billing limit, not proof that four is always better than two.
Kidney Health Check
Kidney Health Australia (CKD handbook, 5th edition, July 2024): people with risk factors get a Kidney Health Check (blood pressure, eGFR, urine ACR) every one to two years, and annually if they have diabetes or hypertension, or are First Nations adults in the handbook's risk group. An eGFR below 60 mL/min/1.73m² is repeated within seven days to exclude acute injury, then again over three months before chronic kidney disease is diagnosed. A raised urine ACR is repeated, preferably on a first-morning void, over the same three-month window.
Diagnostic HbA1c without known diabetes
MBS item 66841 funds a diagnostic HbA1c in an asymptomatic high-risk adult not more than once in 12 months. The 2015 ADS diagnostic guidance, still the reference the 2023 update points back to, says a result under 48 mmol/mol in that setting should be repeated 12 months later. That is a screening clock, not a preventative-membership clock.
What the Red Book does not schedule
There is no Red Book interval for a routine full blood count, liver enzymes, ferritin, vitamin D, B12, TSH, sex hormones, ApoB, or hs-CRP in a well, low-risk adult. Those tests are ordered when the history, a medicine, a symptom, or a separate guideline makes them indicated, or they are paid for privately as a preventative panel.
A First Nations annual health check is a different, stronger schedule than the general-population table. Do not flatten those two rows into one "every few years" sentence.
What those MBS frequency caps actually pay for, and what a routine check-up does not automatically fund, is on the Medicare blood tests guide.
Mechanism
Why some markers need a shorter gap
The reason colleges use different gaps is biology, not bureaucracy. A marker can only change as fast as the thing it is made from.
HbA1c is limited by red-cell lifespan
Glucose attaches to haemoglobin without an enzyme (non-enzymatic glycation) for as long as that red cell circulates. Adult red cells live about 100 to 120 days. Your bloodstream holds cells of every age, so the result is an average weighted toward the most recent four to eight weeks, not a flat three-month mean. That is why a six-week retest after a diet change can move, and why a two-week retest mostly remeasures the same cells.
Glucose, insulin, and triglycerides move in weeks
Fasting glucose and fasting insulin describe the last night, not the last quarter. Triglycerides respond to recent energy intake and alcohol. That is useful when you changed something, and noisy when you did not. They belong on a shorter preventative clock than ferritin or ApoB, which is why Hemexa repeats them at six months and leaves iron and particle number on the annual draw.
hs-CRP is an acute-phase protein
High-sensitivity CRP rises within hours of infection, injury, or a hard training session. A mid-year result drawn while you are unwell is not a new baseline. The useful retest is when you are well, at least several days after an acute illness, and longer after an unaccustomed race or training block.
Ferritin and Lp(a) are slow for different reasons
Ferritin estimates stored iron. Stores change over weeks to months after diet or treatment, not over days. Lipoprotein(a) is more than 90% genetically set in the ESC/EAS account, so a second draw rarely changes the risk story unless the assay changed, menopause shifted a borderline result, or a specialist is following a treatment that targets it.
If you only remember one mechanism: match the gap to the turnover of the molecule, not to the calendar habit of an annual check-up.
Reading a retest
How to read a second result
A second number is not automatically a trend. Pathologists have a name for the smallest move that is unlikely to be noise.
Reference change value, not a vibe
Fraser (Clin Chem Lab Med, 2012) restates the usual formula: a change has to exceed both the lab's analytical imprecision and the person's own within-subject biological variation before you treat it as real. The European Federation of Clinical Chemistry and Laboratory Medicine keeps a living database of those variation estimates. This page does not print a home-made percentage table, because the numbers are method-specific and the database is the source, not a blog.
Same laboratory, same method
Pathology Tests Explained tells you to use the interval on the report from the lab that did the analysis. The same rule applies to a retest. A 0.3 mmol/L LDL shift after you changed providers can be a transferred method, not a change in you. If you are comparing this year to last year, confirm it is the same network and the same assay.
Same conditions on the day
Fasting glucose, insulin, and triglycerides need the same overnight fast, water only. Morning testosterone and some other hormones need the same clock time. hs-CRP needs you to be well. A "worse" result after a late dinner, a long-haul flight, or a virus is often the protocol, not the year.
The index of individuality is the related idea: when you vary much less than the population does, your own previous result is a better comparison than the printed reference interval. That is the laboratory argument for keeping a file, not for testing every month. The companion argument, why an in-range result is still not a clean bill of health, is on the reference range vs optimal range guide.
Worked examples
Four markers, four cadences
Competing Australian pages give one interval for "blood tests." The differentiated fact is that four common markers already have four different official or biological clocks. The full walkthrough for each assay lives on its own guide. This page only needs the cadence.
HbA1c: three clocks, one molecule
High-risk adult, no diabetes: one diagnostic test per 12 months (MBS 66841), then repeat in 12 months if it is under 48 mmol/mol. Prediabetes: annual, per the 2020 ADS primary-care statement. Established type 2 diabetes: usually three months, six months if stable, at most four Medicare-funded monitoring tests a year. Hemexa's six-month preventative draw sits between the screening clock and the diabetes-monitoring clock. It is not a substitute for the three-month diabetes schedule your GP uses when you are not at target.
Lipids: risk category, not a birthday
A well adult at low five-year CVD risk can wait up to five years for the next calculator run. Intermediate risk comes back in two years, sooner if risk factors worsen. High risk is managed, not re-scored on the same clock. Standard lipids can still be redrawn sooner after a diet, weight, or medicine change. That follow-up is monitoring a change, not repeating the five-year screen.
Ferritin: wait for the stores
Australian adults use under 30 µg/L as the usual deficiency cut-off (RCPA, GESA, Lifeblood). WHO still uses under 15 µg/L for a well population. After you change iron intake or treatment, a retest is timed in weeks to months, not days, because stored iron does not turn over on a weekly clock. A normal haemoglobin does not settle the question. That argument is on the ferritin guide.
Lp(a): once is the guideline, not never again
ESC/EAS (2019, restated in the 2025 focused update) say measure lipoprotein(a) at least once in every adult's lifetime. The Australian Atherosclerosis Society 2023 position statement recommends testing in premature atherosclerotic disease and in people at intermediate-to-high risk. It does not advise universal population screening. A second measurement is reasonable if the first assay is hard to compare, after menopause when the first result was borderline, or when a specialist is following a therapy that targets Lp(a).
If those four already disagree, a single "every year" or "every five years" answer for the whole blood book is the wrong shape. Start with the HbA1c, high cholesterol, ferritin, and lipoprotein(a) guides if you want the assay, not just the clock.
Shorter gaps
When more often is warranted
Shorter gaps are for a reason you can name. They are not a general upgrade on being thorough.
A new symptom, medicine, or diagnosis
Fatigue, unexpected weight change, a new GLP-1 or GIP medicine, a steroid, or a just-made diagnosis resets the clock. The relevant marker guide, and your GP, set that interval. A membership calendar does not override it.
Confirming an abnormal before you name a disease
CKD needs a reduced eGFR or a raised urine ACR to persist for three months. Diabetes in someone without symptoms needs a second diagnostic test. A single flagged line is a prompt to repeat, not a label.
You changed something on purpose
Diet, training, a supplement, or a lipid-lowering medicine can justify a six-month metabolic or lipid redraw. Vitamin D is the tighter case already used on Hemexa's vitamin D guide: retest 8 to 12 weeks after a dose change, then annually once stable. TSH after starting or changing levothyroxine is commonly rechecked at 6 to 8 weeks, then every 6 to 12 months once stable.
Pregnancy has its own rules, including a different HbA1c Medicare item and a ban on using HbA1c to diagnose gestational diabetes. That is a specialist schedule, not a preventative-membership add-on.
Longer gaps
When less often is enough
More draws are not automatically more information. Some markers are finished after one good result.
Low cardiovascular risk, unchanged life
If the 2023 calculator put you under 5% five-year risk, and nothing in the risk-factor list has moved, the guideline's own clock is five years. Paying for a private lipid panel every quarter does not make that score more true.
A genetically stable result
Lp(a) is the clean example. Repeating it on every birthday is not what ESC/EAS asked for. Hemexa still includes it on the baseline panel so you have the number on the same dashboard as ApoB and the standard lipids. That is access, not a claim that annual Lp(a) is medically required.
A normal result you are not acting on
A stable TSH, a replete ferritin, or a vitamin D you are not supplementing does not get more accurate because you redrew it in March. Save the extra needle for a marker that can move, or for a question your clinician actually has.
Monthly consumer panels are a product category, not an Australian college recommendation. If a service cannot say which marker justifies the extra draw, the extra draw is the product.
Product
How Hemexa schedules the two panels
Hemexa splits the year into two panels. The split is company policy, read from the live marker schedule, not from a Red Book table.
Annual baseline, 76–80 signature markers
The annual draw is the wide set: iron studies, full blood count, liver enzymes, eGFR and urine ACR, vitamin D, B12, thyroid (TSH, free T4, free T3), sex hormones including the female-only oestradiol panel, ApoB, and Lp(a), plus the metabolic markers that also come back at six months. Exact counted totals depend on sex. The membership copy already published on this site is the source for those totals, not a new figure invented here.
Six-month retest, 12 markers, both sexes
The included mid-year panel is fasting glucose, fasting insulin, HOMA-IR, HbA1c, total cholesterol, HDL, LDL, non-HDL, triglycerides, the two common lipid ratios, and hs-CRP. Those twelve are identical for men and women. They are the markers that can move with diet, weight, training, or a medicine inside a year. ApoB, ferritin, thyroid, and the hormone panel stay on the annual draw.
What this model is not
It is Hemexa policy, not a claim that RACGP wants well adults tested twice a year. It is not a combined "year-one marker count" made by adding the two panels together: that double-counts every marker drawn twice. It is not a substitute for the three-month diabetes schedule, the seven-day eGFR repeat, or a GP review when something is flagged.
If you already have a clinician-set interval that is tighter than this, follow that interval. The membership calendar is the default for preventative tracking, not a ceiling on medically indicated testing.
FAQ
Frequently asked questions
- How often should a healthy adult in Australia get blood tests?
- There is no single official answer. RACGP does not recommend a yearly comprehensive panel for a well, low-risk adult. Cardiovascular risk is reassessed within five years if it is low, and within two years if it is intermediate. Diabetes risk is scored every three years from age 40, with a blood test when the score is high. A private preventative panel is a separate decision, usually annual, sometimes with a mid-year metabolic redraw.
- Is an annual blood test enough?
- For a well adult with low cardiovascular risk and no condition being monitored, an annual wide panel is already more often than the Red Book screening clocks. Markers that move with diet and weight (glucose, insulin, HbA1c, standard lipids, hs-CRP) can justify a six-month look if you are changing something or watching a borderline result. Established diabetes is usually every three months, not every year.
- How often should I retest cholesterol in Australia?
- healthdirect: every five years from 45 for a healthy person, from 35 if you are Aboriginal and/or Torres Strait Islander, and yearly if you already have high cholesterol, diabetes, heart disease, or kidney disease. The 2023 CVD-risk guideline is finer: five years if five-year risk is under 5%, two years if it is 5% to under 10% and you are not on treatment, and clinical follow-up rather than calculator reassessment once risk is 10% or above.
- How often should I retest HbA1c if I do not have diabetes?
- If you are an asymptomatic high-risk adult, Medicare funds a diagnostic HbA1c once every 12 months (item 66841). ADS 2015: repeat in 12 months if the result is under 48 mmol/mol. If you are in the 42 to 47 mmol/mol band, the 2020 prediabetes statement recommends annual HbA1c. Hemexa also redraws HbA1c at six months on the preventative retest. That is membership policy, not the Medicare diagnostic rule.
- Do I need blood tests every six months?
- Not as a national rule. Six months is a common preventative interval for markers that can move inside a year, and it is the RACGP option for stable type 2 diabetes. It is not the Red Book interval for a well adult's lipids, iron, thyroid, or hormones. If nothing has changed and every result is unremarkable, a six-month needle is optional, not mandatory.
- How often does Medicare pay for blood tests?
- Medicare pays when a treating practitioner decides a listed item is necessary, not on a membership calendar. Some items have their own caps: diagnostic HbA1c once per 12 months, monitoring HbA1c at most four times per 12 months, vitamin B12 once per 11 months for most people. The dedicated Medicare page walks through the screening note, episode coning, and current fees. A Hemexa panel is private.
- Should I repeat a test that came back just outside the range?
- Often yes, and sometimes on a short clock. A low eGFR is repeated within seven days, then over three months. A diagnostic diabetes result in someone without symptoms is confirmed on a second test. A flagged TSH or ferritin is interpreted with the history, and often with a planned repeat, not with an instant label. An H or L flag on a 95% reference interval is a prompt. About one in twenty healthy results will flag by design.
- Is Hemexa's six-month retest medically required?
- No. It is included membership policy on 12 faster-moving markers. Colleges do not require a well adult to repeat glucose, insulin, lipids, and hs-CRP at six months. The value is a structured look at markers that can move after a change you made, on the same methods, six months apart.
How Hemexa fits
How Hemexa can help
The product argument is a named schedule you can audit: one wide annual baseline, one included mid-year metabolic redraw, and a dashboard that keeps the same methods next to each other. It is not a claim that twice a year is the Australian standard of care.
Two panels, not a double-counted total
Membership includes the 76–80 marker annual baseline and the included 12 marker six-month retest. The two lists overlap on purpose. Adding them together is not a published Hemexa figure.
The marker guides keep the official clocks
HbA1c, ferritin, eGFR, lipids, vitamin D, and thyroid each keep their college interval on their own page. This page is the index, not a second copy of those assays.
Collection through Healius Pathology
Blood is collected through Healius Pathology. Membership starts at AU$1,199 a year. Hemexa does not replace your GP, and a preventative calendar is not a diagnosis.
Sources
References
RACGP. Guidelines for preventive activities in general practice (Red Book), 10th edition. About the Red Book. View source ↗
RACGP. Red Book: cardiovascular disease (CVD) risk. View source ↗
RACGP. Red Book: diabetes. View source ↗
National Heart Foundation of Australia. (2023). Australian guideline for assessing and managing cardiovascular disease risk. View source ↗
Nelson, M. R., et al. (2024). 2023 Australian guideline for assessing and managing cardiovascular disease risk. Medical Journal of Australia, 220(9). View source ↗