Medical Oncologist
Monitoring and follow-up
Tests and Monitoring — While You Are on Lenvatinib
Lenvatinib works in ways that require your team to watch several things closely. The tests are not a sign that something is wrong — they are how your team catches changes early, before they become a problem.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Blood pressure is the most common concern — Lenvatinib raises blood pressure in a significant proportion of patients. It is checked at every visit and often at home between appointments.
- Liver, kidneys and urine are all watched — Lenvatinib can affect how the liver and kidneys work, and can cause protein to appear in urine.
- Thyroid levels are checked throughout treatment — Lenvatinib can reduce thyroid hormone production. TSH is monitored regularly and the effect is straightforward to manage.
- Results guide your dose — If a result changes significantly, your oncologist may adjust your dose or add a medicine to manage the effect.
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Lenvatinib monitoring covers blood pressure, liver function, kidney function, urine protein and thyroid hormone levels at regular clinic visits. These tests are not about finding new cancer — they track how your body is tolerating the drug. Your oncologist uses the results to keep your dose as effective and as safe as possible.
What tests will I need while taking lenvatinib?
Blood pressure
NCCN toxicity management guidance identifies hypertension as one of the most frequently occurring effects of lenvatinib. Your team will check it at every clinic visit and may ask you to monitor it at home between appointments. If your readings are persistently high, your oncologist will prescribe a blood pressure medicine, adjust your lenvatinib dose, or both. Uncontrolled high blood pressure carries cardiovascular risks, which is why it is the most closely watched aspect of this treatment.
Urine protein (proteinuria test)
Lenvatinib can cause protein to leak from the kidneys into urine. A dipstick urine test is done at regular intervals. If protein is detected, a more detailed urine collection may follow. A small amount of protein is common and is usually monitored rather than acted on immediately. A larger amount may lead to a dose reduction or a temporary pause while the kidneys settle.
Liver function tests
Blood tests measuring liver enzymes such as ALT and AST show whether the liver is under stress. Your team checks these at baseline before treatment starts, then at regular intervals. A modest rise in liver enzymes is not uncommon and is watched closely. A significant rise may prompt a dose change or a temporary pause to allow the liver to recover before treatment continues.
Kidney function
Creatinine and urea levels in the blood show how well the kidneys are filtering. A rise in creatinine does not automatically mean treatment needs to stop. Your oncologist will look at the trend across visits alongside your urine protein result, since the two together give a fuller picture of how the kidneys are being affected.
Thyroid hormone levels (TSH)
Lenvatinib commonly reduces thyroid hormone production over time. You may not feel any symptoms in the early stages. Your team will check TSH regularly throughout treatment. If your TSH is high, thyroid hormone replacement tablets are prescribed. This is a well-understood and manageable effect and does not usually require stopping lenvatinib.
Electrolytes and heart tracing (ECG)
Lenvatinib can lower levels of calcium, potassium and magnesium in the blood. Low electrolyte levels can affect the heart's electrical rhythm. Blood tests check these regularly. If levels fall, your team may prescribe supplements. An ECG may be done at baseline and periodically if your oncologist is watching your heart's QT interval during treatment.
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Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
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Dr. Mohammed Imran
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Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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What should I do about my health between clinic visits?
Blood pressure is the one thing you can monitor yourself at home. Your team will advise you on what readings to watch for and when to call. A standard upper-arm home blood pressure monitor is worth having for the duration of your treatment.
Between visits, watch for new symptoms: swelling in your legs or ankles, changes in how much urine you pass, unusual tiredness, yellowing of the skin or eyes, or chest pain. These can be early signs of changes that your clinic tests will also pick up.
Do not wait for your next scheduled appointment if a new symptom appears and worries you. Call your oncology team the same day.
How does monitoring work at CION?
Most blood tests and urine checks are done at your CION day-care visit, before or alongside your review with your oncologist. You do not usually need to arrange them separately.
If imaging such as a PET-CT scan is needed to assess how the cancer is responding to treatment, CION coordinates this with a partner imaging centre and makes sure the results reach your team before your next review appointment.
Your monitoring schedule is set individually. How often tests are done can change depending on your results and how long you have been on treatment. If you are unsure when your next test is due, ask at the end of your next visit.
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Common questions
Frequently asked questions
How often will I need blood tests on lenvatinib?
Your oncologist sets the frequency based on your individual results and how stable they are. Tests tend to be more frequent at the start of treatment, when your body is still adjusting. If your results are consistently within an acceptable range, the interval between tests may lengthen. If a result is borderline, testing may temporarily become more frequent. Ask at each visit when the next set is due and whether the schedule has changed.
Can I check my own blood pressure at home?
Yes, and your team will likely encourage it. A standard upper-arm blood pressure monitor is sufficient. Your oncologist or nurse will tell you how often to check and what readings should prompt you to call. Keep a simple log — date, time, and both numbers — so your team can see the pattern at your next visit rather than relying on a single clinic reading.
What happens if one of my test results is abnormal?
It depends on which test and how far outside the expected range the result is. A mildly abnormal result is often managed with a repeat test and close observation rather than an immediate change to treatment. A significantly abnormal result may lead to a dose reduction, a short pause in lenvatinib, or a new medicine to manage the side effect. Your oncologist will explain the result and what it means for your treatment before making any change.
Will the monitoring tests tell us whether lenvatinib is working?
Not directly. The routine monitoring tests — blood pressure, liver, kidneys, thyroid, urine protein — are about how your body is tolerating the drug, not about whether the cancer is responding. Response is assessed separately through imaging such as CT or PET-CT scans, which your oncologist will arrange at intervals. If you are unsure when your next response assessment is scheduled, ask at your next appointment.
Do I need to fast before my blood tests?
For most of the routine blood tests done on lenvatinib, fasting is not required. If your oncologist also orders a glucose or lipid test, those may need a fast — your team will tell you if that applies. If you are unsure before an appointment, call the clinic and ask. Arriving with food or drink that morning will not usually affect the results your team is most closely watching.