Medical Oncologist
While you are on abiraterone
Tests and Monitoring — While You Are on Abiraterone
Abiraterone changes how hormones are made in your body, and that affects more than just the cancer. Regular blood tests are not a formality — they catch side effects before they become serious, and tell your team whether the treatment is working.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- Liver tests matter most early on — The liver risk from abiraterone is highest in the first few months, so tests are more frequent then.
- Potassium can drop silently — Low potassium causes few symptoms until it is quite low, which is why it is caught through blood rather than by how you feel.
- PSA tracks the cancer — A falling PSA is usually a sign the drug is working. A rising trend is one signal the team watches carefully.
- You are part of the monitoring — Symptoms you notice between appointments — swelling, dizziness, fatigue — are as important as any blood result.
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Abiraterone requires regular liver function tests, a potassium check, blood pressure monitoring, and a PSA. NCCN and ESMO guidelines call for liver tests more often in the first few months, when the risk is highest, and less often once you are stable. Knowing what each test watches for helps you understand your results and report anything unusual early.
Why does abiraterone need regular blood tests?
Abiraterone blocks an enzyme that controls hormone production in the adrenal glands and the tumour itself. That blockade is what makes it effective against prostate cancer. It also shifts the balance of other hormones in your body.
That shift can raise blood pressure and lower potassium. Both changes happen silently, without you feeling much different. It can also stress the liver, particularly in the first few months.
The blood tests are how your team catches these changes early enough to act on them without stopping treatment. Missing a test does not mean nothing is happening — it means the information is not available.
Which tests will you need, and what does each one check?
- Liver function tests (ALT and AST)Checks whether abiraterone is straining the liver. Done more often in the first few months, then less frequently once levels are stable. A raised result may lead to a dose change or a short pause.
- PotassiumChecks for low potassium, which abiraterone can cause through its effect on the adrenal glands. Low potassium can cause muscle weakness or an irregular heartbeat, so it is caught through blood rather than symptoms.
- Blood pressureMeasured at each clinic visit. Abiraterone can raise blood pressure. If it rises, your team may adjust your medicines or ask you to check it at home between visits.
- PSATracks the cancer's response. A falling PSA generally means the drug is working. A rising trend over several readings is what prompts a closer look — a single higher result is not automatically a cause for alarm.
- Blood sugarAbiraterone is taken with prednisone or prednisolone, which can raise blood sugar. Particularly important if you have diabetes or are at risk. Your team may ask about thirst, urination changes, or unexplained fatigue.
- TestosteroneConfirms that testosterone is at castrate levels — the hormonal environment in which abiraterone works best. Usually checked periodically rather than at every visit.
- Imaging — CT scan or bone scanNot a blood test, but part of overall monitoring. Done periodically to assess whether the cancer is responding or has changed. The interval between scans depends on your individual situation.
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What happens if a result comes back outside the normal range?
An abnormal result does not automatically mean treatment stops. Most changes are managed with a dose adjustment, a short pause, or a new medicine — potassium supplements if your levels are low, or a blood pressure tablet if that is what has risen.
Liver results that rise significantly are taken more seriously. NCCN and ESMO guidance recommends holding abiraterone and retesting when liver enzymes reach a level your oncologist will specify, then considering a restart at a lower dose once they settle.
Between appointments, call your team if you notice yellowing of your eyes or skin, dark urine, significant ankle swelling, or a heartbeat that feels irregular or unusually fast. These are reasons to be seen before your next scheduled test.
What happens at each monitoring appointment?
Before you leave home
Write down any new symptoms since your last visit — ankle swelling, dizziness when you stand up, changes in urination, unexpected fatigue, or anything else that is different. Prepared notes are more complete than anything you try to recall on the spot.
Blood draw and blood pressure check
A blood sample is taken for whichever tests are scheduled for that visit. Blood pressure and weight are also recorded. Fasting is not usually required, but confirm with your team when you book the appointment.
Results are reviewed
Your oncologist or a member of the team reviews the numbers — sometimes on the same day, sometimes at a follow-up call. They compare against your previous results, looking for trends rather than isolated readings.
Any changes to your plan are explained
If a result needs action, your team will tell you what is changing and why. This might be a new supplement, a medicine change, a sooner repeat blood test, or a different abiraterone dose.
Between appointments
If you have been asked to monitor your blood pressure at home, record the readings with the date and time. Report anything that worries you before your next scheduled visit rather than waiting.
Did you know?
Liver enzyme rises on abiraterone are most likely to occur in the first three months of treatment, which is why monitoring is most intensive at the start.
Once liver function has stayed stable through that window, the frequency of testing usually reduces — a sign the treatment is being well tolerated, not a sign that monitoring has stopped mattering.
Source: NCCN Guidelines: Prostate Cancer — Management of Treatment-Related Toxicities
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Common questions
Frequently asked questions
How often will I need blood tests on abiraterone?
The frequency is highest in the first few months, when liver enzyme rises are most likely. After that, once your results have been stable for a period, tests are usually spread further apart. Your oncologist will set the schedule for your situation. The intervals may change if a result comes back outside range — in that case a repeat test is arranged sooner. Ask at each appointment when the next test is due and what it is checking for.
What does a rising PSA mean while I am on abiraterone?
A single PSA result that is higher than the previous one does not automatically mean the treatment has stopped working. PSA can fluctuate, and your oncologist looks at the trend across several readings rather than any one number. A consistent upward trend over multiple tests is what prompts a closer look — which might mean imaging to assess what is happening, or a conversation about whether the plan needs to change. Your team will explain what they are seeing.
Do I need to fast before my blood test?
For most standard abiraterone monitoring tests — liver enzymes, potassium, PSA — fasting is not required. Blood sugar testing may require fasting if a full glucose assessment is being done rather than a routine check. Ask your team or the phlebotomy nurse when you book the appointment so you are not caught out on the day.
Can I skip a monitoring appointment if I feel completely well?
Feeling well does not mean the blood results are normal. The most important things abiraterone monitoring checks for — a rise in liver enzymes, a drop in potassium — do not reliably cause noticeable symptoms until they are quite advanced. The test exists precisely because how you feel is not a reliable guide. If you genuinely cannot attend on the scheduled date, contact your team to rearrange rather than skipping.
What should I tell my team at each visit?
Tell them about any new symptoms since the last appointment — swelling in your ankles or legs, dizziness when you stand up, a heartbeat that feels irregular, unexpected fatigue, yellowing of your skin or eyes, or dark urine. Also mention any medicines or supplements you have started, including anything bought without a prescription, since some interact with abiraterone. If you are checking your blood pressure at home, bring those readings with you.