How often do you need blood tests on Cosentyx (secukinumab)?
Cosentyx (secukinumab) is a biologic used for conditions such as plaque psoriasis, psoriatic arthritis, and ankylosing spondylitis. The exact blood-test schedule is set by your prescribing clinician and depends on your diagnosis and other medicines, because Cosentyx does not have one single “universal” monitoring plan.
In practice, clinicians commonly order periodic blood tests to watch for effects that could be related to infection risk and to check baseline/ongoing safety in people with comorbidities or prior blood abnormalities. Your schedule is also influenced by whether you take other immunosuppressive drugs.
What blood tests are usually checked before and during treatment?
Common monitoring often includes baseline tests such as:
- Full blood count (FBC/CBC)
- Liver function tests
- Kidney function tests
- Infection screening (particularly tuberculosis and hepatitis status before starting biologic therapy)
During treatment, follow-up blood tests are typically repeated at intervals chosen by the prescriber, with more frequent testing if you have risk factors, abnormal prior results, or are also taking other systemic therapies.
Does Cosentyx require more frequent testing if I’m also on other medicines?
Yes, monitoring can be more frequent if Cosentyx is used alongside other agents that affect blood counts or liver function. For example, if you also take methotrexate, corticosteroids, or other immunosuppressants, your clinician may test more often to keep track of combined effects.
What if your test results are abnormal or you get sick?
If blood counts or liver tests come back abnormal, your clinician may:
- Repeat the test sooner to confirm the result
- Adjust or pause treatment
- Check for infection or other causes
If you develop signs of infection (fever, persistent cough, feeling unwell), clinicians often reassess your treatment and may order blood tests urgently rather than on the routine schedule.
Who sets your exact timetable?
Your treatment team. The safe testing interval depends on:
- Your condition (psoriasis vs psoriatic arthritis vs other indications)
- Your baseline bloodwork
- Your overall infection risk and past history (including TB/hepatitis screening results)
- Other drugs you take
If you tell me your diagnosis and whether you also take methotrexate or other immunosuppressants, I can help you narrow down the kind of monitoring interval clinicians commonly use for that situation.