Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test
Homocysteine Blood Test

Over 250k Biomarkers Tested

Homocysteine Blood Test

$45.00 AUD

Want to check a marker that reflects both your cardiovascular risk and how well your body is processing folate and B12?

Measures homocysteine, an amino acid that rises when folate, B12, and B6 metabolism is impaired. Elevated levels are associated with increased cardiovascular and neurological risk. Used to investigate B-vitamin deficiency and assess methylation function. Fasting preferred.

Collection Location
Specimen Type

You will be emailed a referral to take to your local collection centre. If you ever have any questions, we're here to help.

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Getting your health measured shouldn't be hard! We're here to help you every step of the way.

1
Order a test

Order a test

Order the private test that suits you and your goals. After ordering, you will receive your referral by email.

2
Collect the sample

Collect the sample

Attend one of our 4000+ partner collection centres throughout Australia. Search locations.

3
Receive your results

Receive your results

View all your lab results in your secure health dashboard. Easy!

Overview

Homocysteine is an amino acid produced during the metabolism of methionine, an amino acid found in protein-rich foods. In a healthy system, homocysteine is quickly recycled back into methionine (using folate and B12) or converted into cysteine (using B6). When any of these B vitamins are insufficient, or when the enzymes involved are less efficient due to genetic variation, homocysteine accumulates in the blood.

Elevated homocysteine has been associated with increased cardiovascular risk. Research links higher levels to endothelial damage (injury to blood vessel walls), which can promote plaque formation and increase the tendency for blood clots. This association is independent of cholesterol, meaning someone with normal cholesterol can still carry elevated cardiovascular risk if their homocysteine is high. For this reason, homocysteine testing can add valuable context to a lipid panel.

Beyond cardiovascular health, elevated homocysteine has been associated with increased risk of cognitive decline and neurological conditions in epidemiological research. It is also used as a functional marker of B12 and folate adequacy. Because homocysteine rises when these vitamins are insufficient for normal metabolism, it can flag a functional deficiency even when serum B12 or folate levels appear within the normal range.

The most common causes of elevated homocysteine are low folate, B12, and B6. Other contributors include chronic kidney disease, hypothyroidism, certain medications (including methotrexate and some anti-epileptic drugs), smoking, and excess alcohol. MTHFR gene variants, which reduce the efficiency of the methylation cycle, can also lead to persistently elevated levels.

Your practitioner will interpret homocysteine alongside folate, B12, B6, and your overall clinical picture. If levels are elevated, addressing nutritional deficiencies is typically the first step.

Symptoms

To assess cardiovascular and neurological risk, investigate B12 and folate metabolism, and evaluate methylation function as part of a broader health assessment.

Questions

  • Fasting for 10–12 hours is preferred. While homocysteine is not as strongly affected by food as some markers, fasting reduces variability and gives the most reliable baseline result.
  • Low folate, B12, and B6 are the most common causes. Other contributors include kidney disease, hypothyroidism, some medications (including methotrexate and certain anti-epileptic drugs), smoking, excess alcohol, and MTHFR gene variants that reduce methylation efficiency.
  • Not exactly. Homocysteine is a functional downstream marker — it rises when B12 and folate are inadequate for metabolism, even before serum B12 or folate levels appear clearly abnormal. It provides additional information alongside those markers.
  • Elevated homocysteine is associated with increased risk of cognitive decline and dementia in epidemiological research. Whether lowering it reduces that risk is still being studied. A practitioner can put any elevated result in context for you.
  • If you are already taking B12, folate, or B6 supplements and want to see your treated level, continue taking them. If you want to see your baseline before treatment, discuss timing with your practitioner before making any changes.

Dr. Vu Tran
Bloody Good’s Chief Medical Officer

Biomarker Tested

How to prepare

Fasting for 10–12 hours before your blood draw is preferred. Water is fine. Take medications as normal unless your practitioner advises otherwise. Avoid alcohol for at least 24 hours beforehand as it can affect the result.

After the test

If your result is elevated, share it with your GP or specialist. They may recommend testing B12, folate, and B6 alongside it, or investigating MTHFR gene variants if there is a pattern of elevated homocysteine that does not respond to nutritional correction. Lifestyle factors such as smoking, excess alcohol, and poor diet are also known to raise homocysteine levels.

Your test results will be available in your private dashboard. If there are any urgent issues, we'll let you know so you can follow up with your health professional.

Understanding results

Homocysteine is measured in micromoles per litre (µmol/L). Reference ranges vary slightly between laboratories, but results are generally interpreted as follows:

- Normal: below 15 µmol/L in most adult reference ranges
- Mildly elevated: 15–30 µmol/L
- Moderately elevated: 30–100 µmol/L
- Severely elevated: above 100 µmol/L (rare)

Even mildly elevated results are considered worth investigating, particularly in the context of cardiovascular risk factors or suspected B-vitamin deficiency. Results should always be reviewed alongside folate, B12, and B6 levels for context.

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What Our Customers Say

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Frequently bought together

Frequently Asked Questions

Most collection centres accept walk-ins. Some may require a booking - check details when you click on your chosen location.

If your test needs fasting, we’ll include that in your instructions after you order. Fasting usually means no food for 8–12 hours, but water is fine.

Just your pathology referral form (we email it to you)

Of course. Just maybe don’t bring the friend who faints at the sight of blood.

They’re the highly trained professionals who take your blood sample - with a steady hand and a sharp needle. They love blood, but don’t worry… they’re not vampires. Just legends who make blood tests quick, clean, and (almost) painless.

Some of our tests include Urine, Stool, Saliva and more. Each test will have a clear description on what sample you will need to give and instructions on how.