Information for Patients



Full collection instructions are found inside the test kit. You can preview these instructions below.


It is important that you follow the instructions inside your test kit very carefully.

For further support, you can watch this step-by-step video guide.


The SIBO test is a breath test to assess the presence of bacterial overgrowth in the small intestine as a cause of digestive symptoms. SIBO or Small Intestinal Bacterial Overgrowth occurs when there is an overgrowth of commensal bacteria in the small intestine. These bacterium produce either hydrogen or methane gas in response to certain foods, which is what we assess with this test. The SIBO test includes a substrate (lactulose, glucose or fructose) to be consumed before testing the breath multiple times over a 3 hour period.

Click below to preview the sample tests:

ABOUT sibo test

Located in Byron Bay, NSW and founded by Dr. Nirala Jacobi, BHSc, ND (USA), who graduated from Bastyr University in 1998 with a doctorate in naturopathic medicine. Dr Jacobi is considered one of Australia’s leading experts in the natural treatment of small intestine bacterial overgrowth (SIBO), a common cause of IBS.


Not following the instructions will result in sample rejection and your sample will need to be recollected.

Test FAQs

Turn around for SIBO test results is around 2-5 business days.

RN Labs then forwards the results to your practitioner. We cannot send results directly to the patient. Only your practitioner can explain your results to you.

Please allow at least a month after a colonscopy.
Yes. Remember though that only water is to be consumed prior to testing.
Yes. They are the same diet instructions for both tests. However the glucose test requires different testing substance mixing instructions.
No. Unfortunately, we do not want anything that may interfere with the actual testing result. Any laxative use the day before you start testing can influence the test results.
Yes, you can do the testing in this way, although it’s a lot easier to do on consecutive days due to the diet preparation. If you do it separately, please return tests within 3 days of completion.
No. Vegetables are not allowed. No stock powder. Only real meat can be used to make soup/broth.
A small amount of oil for cooking is allowed.
During the manufacturing process the tubes are punctured in order to remove the air inside to create a vacuum. Sometimes you can see this puncture mark, and sometimes you cannot. In addition, the rubber stopper on some of the tubes may appear concave, while appearing convex on others. This too is a normal part of the manufacturing process.
This rubber sheath provides an additional seal against the rubber stopper of the test tube. Please do not remove it.
No. These holes are designed to vent the initial portion of your breath. Covering these holes may actually dilute your samples.
You will not be able to see the air go into the tube, nor will you see any condensation.

General FAQs

This is for a similar reason as to why you need to book an appointment with your GP to discuss general pathology test results. It is important that your practitioner can discuss the results with you; therefore, we cannot give out test results directly to patients.
Functional pathology tests are an extremely comprehensive assessment of what is potentially occurring within a person’s body. They often test very different things than what general pathology tests do. From the results, your practitioner may be able to develop more specific treatment plans that address the cause of your symptoms.
We offer functional pathology tests that have been produced by leading international laboratories, meaning the samples are assessed in overseas labs, such as in the US. This means we cannot offer Medicare rebates on our testing services. Further to this, all of our tests use extremely accurate and scientific, research-backed technology, which can contribute to higher costs. The information gained from functional pathology tests can often provide a new level of insight that allows healthcare practitioners to develop more accurate and patient-specific treatment plans, to ensure their patients are on the right track to feeling better.

The instructions found inside the test kit will tell you to either send by express post, courier pick-up, or general post (depending on what test you are completing and your location). You will either find a pre-paid courier bag or a return postal envelope inside the test kit for returning your sample.

If sending by Aus post express or pick-up courier – it is important that you time your collection to be ready to send/picked-up on a Monday or Tuesday only – so that we receive it in time for our twice-weekly shipments to the overseas labs every Tuesday and Thursday.

  • This is particularly important if the sample is time-sensitive. Please refer to the Collection Instructions found inside your Test Kit to check if your sample is time-sensitive. Any sample that has to be frozen prior to shipment is time sensitive.

  • RN Labs is closed weekends, public holidays, and 4 weeks over Christmas (mid Dec – mid Jan). Please do not conduct your test / send samples during this time.

  • If you are unable to ship the specimen the same day you finish the collection (i.e. over the weekend or public holiday), store your sample as instructed on the Collection Instructions in your test kit.

If sending by general post – please be aware general post can take anywhere from 1-10 days to arrive at our Head Office, which can add to your overall test turn-around time. If you would like your sample to be sent by express post, simply take it to your local post office and pay the additional expense for the express option. Express generally takes 1-2 days and the cost will vary depending on your location.

Please refer to the Collection Instructions found inside your test kit.
Some foods, supplements and medications can influence the test results and these will be noted in the test collection instructions. It is up to your healthcare practitioner to discuss with you what foods, supplements or medications they want you to continue or discontinue. Never discontinue medication without speaking with your healthcare practitioner.
It is best to contact your practitioner – they may like you to wait until you are feeling back to your normal state of health before conducting the test.
It may help to perform the test when you are in the privacy of your home, on a day where you don’t have much else on. Give yourself plenty of time to prepare for the test and approach it as a step-by-step process. After you complete the first step, you can then read the instructions to see what your next step is. Remember, your practitioner has recommended that you do the test in order to help you reach a better state of health. If you are feeling too overwhelmed and / or uncomfortable, we suggest that you contact your practitioner to discuss other options.
RN Labs will never share your test results with anyone other than your healthcare practitioner.
Full test price (including handling fee) is charged to your credit card on the same day we receive your test kit order. The kit is then generally dispatched within 1 business day. Please allow 1-5 working days for delivery.
Request for a refund on an unsubmitted test must be made no more than 30 days after the test kit order. The handling fee will not be refunded.


Should you require further support, our friendly customer service team can help you with any specific questions on billing, shipping, or collection.

For all other enquires, please contact your practitioner. Please be aware that our customer service team cannot assist with any questions regarding your health or why you have been recommended this test. Thanks for your understanding.

S QLD / N NSW Area Manager

Jessica Morland

Jess is a qualified Nutritionist with a Bachelor of Health Science in Nutritional Medicine. She believes that there is no one size fits all approach and is passionate about educating, inspiring and supporting clients and practitioners with a customised approach to healthcare. Specialties include preconception, pregnancy, post-natal and infant care. 

Jess is excited to build relationships, educate and share her knowledge with both retail and practitioners in South Queensland and Northern NSW.

Lauren Matich, BHSc (Nat.)

Lauren Matich

BHSc (Nat.)

Lauren is an NHAA accredited Clinical Naturopath with a Bachelor of Health Science. She is incredibly passionate about natural health and educating clients on the foundational importance of nutrition, lifestyle and stress management and believes complimenting these building blocks with nutraceutical support and functional testing often holds the key to optimal health and vitality. Lauren looks forward to supporting practitioners and clients in these key areas.

Specialties include supporting thyroid health, digestive disorders and mental health.