Medical Oncologist
Before you start
Kidney and liver tests before chemotherapy
Because those two organs are how the drugs leave your body. The kidneys filter some into the urine and the liver breaks others down. How well each is working decides how much of a drug can safely be given, and sometimes which drug is chosen at all. The result shapes the dose far more often than the decision to treat.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
Why are kidney and liver tests done before chemotherapy?
Because those two organs are how the drugs leave your body. The kidneys filter some of them into the urine and the liver breaks others down. How well each is working decides how much of a drug can safely be given, and sometimes which drug is chosen at all.
They are ordinary blood tests, taken with everything else, occasionally with a urine collection. Nothing is scanned and nothing is injected. The result shapes the dose far more often than it shapes the decision to treat.
Slow clearance means the drug stays longer
If an organ is working below par, the same amount of drug remains in the body for longer and acts on it for longer. That is what makes side effects heavier. Reducing the dose to match is not giving you less treatment, it is giving you the right amount for your body.
They become a running check, not a one-off
The baseline is taken now, and these tests are often repeated through the course. Chemotherapy itself can nudge the numbers, so the team watches them rather than checking once and forgetting.
Ask whether yours will be repeated before every cycle or only sometimes. It changes how many hospital trips you plan for.The words on the report
What the terms on the report actually mean
- Creatinine
- A waste product the kidneys clear. When they slow down it builds up, so a rising value is the usual first sign. It is affected by muscle mass and by how much you have had to drink, which is why it is read alongside the other figures rather than alone.
- eGFR or creatinine clearance
- An estimate of how much blood the kidneys filter, calculated from the creatinine along with your age and sex. Several drug doses are worked out directly from this figure.
- Urea
- Another waste product. It rises when the kidneys are struggling but also simply when you are dehydrated, which is common after a spell of vomiting or loose motions.
- Bilirubin
- The pigment that causes yellowing of the eyes and skin when it builds up. Several drug doses are reduced when it is high, so it is one of the figures checked most closely before each cycle.
- SGOT and SGPT
- Also written as AST and ALT. These are enzymes released when liver cells are irritated. Mild rises are common and often settle. Large rises prompt a pause and a closer look.
- Albumin
- A protein made by the liver. A low value reflects long-standing poor nutrition or liver trouble, and it matters because it affects how much of a drug is free to act in the bloodstream.
Not sure whether this applies to you?
Ask an oncologistWhat the team does with it
How an abnormal result changes the plan
Four responses, roughly in order of how often they are used. Cancelling treatment is not among them.
The dose is reduced
The commonest response by a wide margin. The amount is matched to what your body can clear, so the drug does its work without staying around long enough to cause harm. This is normal practice, not a second-best plan.
Worth asking
- Whether the dose can rise again if things improve
- What is being watched between cycles
A different drug is chosen
Some drugs lean heavily on the kidneys and others on the liver. If one organ is weak, the team can often pick a drug that leaves by the other route and reach the same goal.
Treatment is delayed briefly
Often because the figure reflects something fixable: dehydration, an infection, a blockage, or another medicine. Correct that and the numbers frequently come back on their own within days.
Common fixable causes
- Not drinking enough after a sickly week
- Painkillers and some other tablets
Extra fluids are given
For some drugs a drip is run before and after the treatment to protect the kidneys, and you are asked to drink steadily for a day or two afterwards. This lengthens treatment day and is worth planning around.
Your part
What actually helps protect these organs
- Drink steadily through the day, more so around treatment days
- Report vomiting or loose motions early, before you get dry
- Ask before taking any painkiller, including the ordinary ones
- Tell the team about every other tablet you take, from any doctor
- Stop alcohol during the course, and say so if that is difficult
- Leave out herbal, ayurvedic and liver tonics unless cleared first
- Keep sugar and blood pressure controlled, as both wear on the kidneys
- Do the pre-cycle blood test on time rather than on the morning itself
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Being straight with you
What this page cannot tell you
It cannot tell you what your own numbers mean. Laboratories use different ranges, the figures are read together rather than one at a time, and the same creatinine means different things in a young labourer and an elderly woman. Only your oncologist can read yours in context.
It also cannot tell you what dose you will get. That comes from your drug, your plan, your body size and these results combined, and the arithmetic is not something to attempt at home from a report.
An abnormal figure is not a diagnosis
A single out-of-range value on one report is very often a temporary thing — a dry week, a chest infection, a painkiller. Repeat it before concluding anything. People frighten themselves badly by reading one number in isolation.
What to do next
Get the baseline bloods done early rather than on the morning of cycle one. Bring every medicine box, including anything herbal, to the planning appointment. Ask which figures will be checked before each cycle. And ask what your own results mean for your dose, in words you understand.
Commonly believed
Four things people misread on these reports
"A reduced dose means I am getting weaker treatment."
It means you are getting the amount your body can actually clear. Giving a standard dose to someone who cannot clear it produces heavier side effects and more missed cycles, which helps nobody. The adjusted dose is the correct dose for you.
"My creatinine is slightly high, so my kidneys are failing."
Creatinine moves with muscle mass, with how much you have drunk, with a spell of vomiting, and with several ordinary medicines. A single mildly raised value usually needs repeating before it means anything at all.
"Liver tonics and herbal remedies will protect me."
Several are themselves hard on the liver, and some interfere with how chemotherapy drugs are broken down. Nothing bought over a counter should go in during a course without your oncologist knowing. Tell them what you are already taking, without embarrassment.
"If the numbers are normal now, they will stay normal."
Chemotherapy itself can shift them, which is why they are rechecked. A change part way through is common, usually manageable, and much easier to handle when it is caught on a routine test rather than when someone becomes unwell.
Questions we are asked
Common questions about kidney and liver tests
Do I need to fast for these tests?
Usually not for kidney and liver function alone, though they are often drawn alongside a sugar or lipid test that does need fasting. Ask when booking, because arriving fasted unnecessarily makes a long hospital morning much harder.
Will an abnormal result stop my treatment?
Rarely. It far more often changes the dose or the drug, or delays the cycle briefly while something fixable is corrected. Being told your kidney function is reduced is information the team plans around, not a verdict.
Can drinking more water improve the numbers?
If dehydration is part of the cause, yes, and it genuinely helps around treatment days. It will not correct long-standing kidney disease. Do not flood yourself with fluid if you have heart trouble or have been told to limit it.
Are these tests repeated before every cycle?
Often, alongside the blood count, though it depends on your drugs. Ask which apply to you and whether the sample can be taken the day before. That one question removes the longest wait from treatment day.
I have hepatitis B. Does that change things?
It needs to be known before you start, because chemotherapy can allow a quiet infection to become active. It is usually manageable with the right cover and monitoring. Tell the team even if it was found years ago and never troubled you.
Can I take my usual painkiller?
Ask first. Several common over-the-counter painkillers are hard on the kidneys, and others affect the liver or platelets. There is almost always something suitable, so you do not need to endure pain while you check.
My relative was told to have a urine collection. Why?
A collection over a full day measures kidney clearance more precisely than a blood test estimate, and some drugs need that precision before the dose is set. It is inconvenient rather than difficult, and the instructions matter.
Will chemotherapy damage my kidneys or liver permanently?
For most people the changes are modest and settle after the course. Some drugs carry a real risk, which is why they come with fluids, dose adjustments and repeat testing. Ask specifically what your own drugs require.
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Sources
- Cancer Research UK — Blood tests during chemotherapy
- Macmillan Cancer Support — Liver function tests
- National Cancer Institute — Chemotherapy to Treat Cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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