Heart, Kidney and Hearing Tests — Before Chemotherapy
If your oncologist has asked for an echocardiogram, a kidney function test, or a hearing check before chemotherapy begins, that is not a bureaucratic hurdle. It is the information your team needs to treat you safely from the first day.
Medically reviewed by Dr. Naresh Gundu, Medical Oncologist, MBBS (Chalmeda Anand Rao Institute of Medical Sciences, Karimnagar) · DNB Internal Medicine (Sir Gangaram Hospital, New Delhi) · DM Medical Oncology (AIIMS) · Last reviewed September 2026
- Heart baseline — An echo records how well your heart pumps before treatment, so any future change has something to measure against.
- Kidney safety — A creatinine test tells your team whether your kidneys can clear chemotherapy drugs efficiently and safely.
- Hearing protection — Some drugs affect the inner ear. A hearing test before treatment makes any change during it measurable and verifiable.
- Protection, not delay — These tests give your oncologist the information they need to plan your treatment safely. They are not obstacles.
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An echocardiogram, creatinine clearance test, and hearing check before chemotherapy are baseline safety measurements. Some chemotherapy drugs can affect the heart, kidneys, or hearing, and your oncologist needs to know your starting function to plan your treatment safely and to detect any change that develops during or after it.
Why does my doctor want an echocardiogram before chemotherapy?
An echocardiogram measures how well your heart is pumping at the moment it is taken. This measurement — your ejection fraction — becomes your personal baseline before treatment begins.
Some chemotherapy drugs are known to affect the heart's pumping function over time. If your team does not have a starting measurement, they cannot tell later whether a change in your heart function was caused by the treatment or was already present before it.
The echo also tells your oncologist whether your heart is strong enough to tolerate the planned treatment. If it shows something unexpected, your team can adjust the plan before chemotherapy starts rather than discovering a problem mid-way through.
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Why do I need a kidney test and a hearing test before chemotherapy?
The kidney function test — usually a creatinine clearance, measured from a blood sample or a timed urine collection — tells your oncologist how well your kidneys are filtering your blood. Some chemotherapy drugs leave the body through the kidneys. If the kidneys are not working well enough, those drugs can build up and cause harm rather than clearing safely.
The hearing test (audiogram) is ordered before chemotherapy drugs that are known to carry a risk to the inner ear. Damage from these drugs typically begins with the ability to hear high-pitched sounds, which fall outside ordinary conversation — meaning it can progress before you notice it yourself. A test taken before treatment begins makes any later change measurable.
Both tests are about knowing where you start. They are not a barrier to treatment. They are the information your team needs to give it safely.
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Frequently asked questions
Why do I need an echo if my heart has always been fine?
The echo is not checking whether your heart is healthy — it is recording exactly how well it pumps today, before any treatment. That measurement becomes your reference point. Some chemotherapy drugs can reduce heart pumping function over time, and the change may be subtle at first. Without a measurement taken before treatment began, a result taken months later has nothing reliable to compare against. The test is about creating a baseline, not about suspecting a problem.
What is creatinine clearance and why does it matter before chemotherapy?
Creatinine clearance measures how efficiently your kidneys are filtering waste from your blood. Some chemotherapy drugs are removed from your body through the kidneys, and if kidney function is reduced, those drugs can accumulate rather than clear. Your oncologist uses this result to understand your kidney function before treatment begins, so they can plan your care appropriately. This is not about excluding you from treatment — it is about ensuring the treatment given is appropriate for your body at that moment.
Which chemotherapy drugs need a hearing test beforehand?
The hearing test is most commonly ordered before drugs that are known to carry a risk to the inner ear. Your oncologist decides whether a hearing test applies to your specific planned treatment — it is not ordered for every chemotherapy regimen. The test captures your baseline hearing across a range of frequencies, including high pitches that ordinary conversation does not reach. Damage from certain drugs often begins in that high range, which is why a starting measurement matters even when your hearing currently seems completely normal.
What happens if my echo result is not normal?
If your echo shows that your heart's pumping function is below what your oncologist considers appropriate for the planned treatment, they will discuss the options with you. This might mean a review with a cardiologist before chemotherapy begins, a different approach, or monitoring with more frequent echo tests during treatment. It does not automatically mean you cannot have any treatment. The value of the test is exactly this — it gives your team the information to act before a problem arises, not after.
Do I need these tests again during chemotherapy, or just at the start?
Many oncology teams repeat the echocardiogram at intervals during treatment, particularly if you are on a drug that affects the heart over time. Kidney markers are often checked regularly as part of routine blood tests throughout chemotherapy. Whether and how often your tests are repeated depends on the drugs you are receiving and your baseline results. Ask your oncologist at your pre-treatment appointment so you know what monitoring to expect during your treatment course.
My echo was done six months ago — do I need a new one before chemotherapy?
That depends on the chemotherapy you are about to start and how your health has been since the last test. Some oncology teams will accept a recent echo done within a set window; others require one taken closer to the start of treatment. Do not assume a recent result will be accepted, and do not assume you need a repeat without asking. Your oncologist's team can tell you in one conversation whether the existing result is sufficient for your planned regimen.
What if a pre-treatment test was not done before I started chemotherapy?
Mention it to your oncologist. Not every regimen requires all three tests, and your team may have had a reason for the order they chose. What matters now is that your team has the information they need going forward. Some tests can still be done during treatment and used as a reference for monitoring from that point. Raising it is about better care from here on, not about revisiting past decisions.
Will these tests delay the start of my chemotherapy?
In most cases they do not cause a significant delay. The echocardiogram and hearing test are outpatient procedures. The creatinine test is a blood or urine test with a quick turnaround. If all results are normal, your team moves forward. If a result raises a question, the short pause to investigate is protecting you — it is a clinical reason to wait, not a bureaucratic one. Ask your team's coordinator whether the tests can be booked alongside other pre-treatment appointments so they run in parallel rather than in sequence.
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