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Immunotherapy Side Effects · Hormone & Endocrine Reactions
Which Hormone Tests Should Be Done — and How Often?
Hormone problems caused by immunotherapy often start with symptoms easy to dismiss — a little more tiredness than usual, feeling unusually cold, mild nausea — which is exactly why a fixed testing schedule matters more than waiting to feel unwell. NCCN and ASCO guidance on managing immune-related adverse events sets out a testing rhythm for checkpoint-inhibitor immunotherapy: baseline hormone tests before you start, repeat testing through active treatment, and continued checks well after your last infusion. This page sets that schedule out in one place, so you and your family can hold your care team to it.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- A schedule, not a guess — the exact tests and how often each is repeated are set out below, so nothing is left to memory.
- Vague symptoms get taken seriously — tiredness, weight change and thirst each map to a specific test, not a wait-and-see approach.
- Extra testing has clear triggers — new symptoms, a borderline result or an upcoming procedure are all reasons to test sooner, explained below.
- Monitoring continues after treatment ends — hormone checks don't stop the day immunotherapy does; see how long they continue.
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Feeling Suddenly Unwell? This Could Be an Adrenal Crisis — Call Now
Sudden severe weakness, persistent vomiting, dizziness, fainting or confusion — especially in anyone already known to have low cortisol or adrenal involvement — can be an adrenal crisis, a medical emergency with no safe home management. Don't wait for a scheduled blood test to confirm it. Go to the nearest emergency room now, or call for help immediately.
Go to the ER now if you notice any of these:
- Sudden severe weakness, dizziness or fainting
- Persistent vomiting, or inability to keep fluids down
- Confusion or collapse
- Severe abdominal pain together with any of the above
If that isn't happening right now, here is the exact hormone-testing schedule to hold your care team to — which tests, how often, and what should trigger a test sooner.
The core panel
Which Hormone Tests Should Be Done During Immunotherapy?
Four tests form the core hormone panel during checkpoint-inhibitor immunotherapy: thyroid function (TSH and free T4), a morning cortisol level for the adrenal glands, blood glucose or HbA1c for the pancreas, and — only if pituitary involvement is suspected — a wider pituitary hormone panel. All four are simple blood draws.
- Thyroid function (TSH and free T4) — the most commonly affected gland; catches an overactive or underactive thyroid early.
- Morning cortisol, with an ACTH stimulation test if the level is borderline — checks adrenal gland function, the test most tied to emergency risk.
- Blood glucose or HbA1c — screens for immunotherapy-induced diabetes, which can appear suddenly.
- Pituitary hormone panel (LH, FSH, prolactin and related hormones) — added only when symptoms suggest pituitary involvement, not a routine test for everyone.
Your oncology team decides which of these apply to you based on your specific immunotherapy drug class and any symptoms — this is the usual starting panel, not a fixed prescription for every patient.
The schedule, in one table
How Often Should Each Hormone Test Be Repeated?
Thyroid and glucose tests are usually repeated before every treatment cycle while you're on active immunotherapy, roughly every three to six weeks depending on your regimen. Cortisol is checked on a similar rhythm, or sooner if symptoms arise. Testing continues, at a slower pace, for at least a year after your last dose.
| Test | Baseline (before starting) | During active treatment | After stopping (first year) | Beyond year one |
|---|---|---|---|---|
| Thyroid function (TSH, free T4) | Before first dose | Before each cycle, roughly every 3–6 weeks | Every 6–12 weeks | Every 6–12 months, or sooner if symptoms return |
| Morning cortisol | Before first dose | Each cycle, or sooner if symptoms appear | Every 6–12 weeks | As directed if you're on steroid replacement |
| Blood glucose / HbA1c | Before first dose | At every visit | Every 8–12 weeks | Annual screening, or sooner with symptoms |
| Pituitary panel | Only if clinically indicated | Only if symptoms suggest pituitary involvement | As directed by endocrinology | As directed by endocrinology |
These are typical ranges drawn from NCCN and ASCO guidance on monitoring immune-related adverse events. Your own oncology team sets your exact schedule based on your specific immunotherapy drug, dose interval and risk factors — use this table to check with them, not to replace their plan.
Beyond the routine schedule
What Triggers Extra Hormone Testing Between Scheduled Checks?
Several situations call for a hormone test sooner than your next scheduled check: any new symptom such as unusual tiredness, weight change, feeling unusually cold, nausea, dizziness or excessive thirst; a borderline result on a previous test; or an upcoming surgery or procedure where steroid dosing may need adjusting.
- A new or worsening symptom — tiredness, weight change, feeling cold, nausea, low blood pressure, palpitations, or excessive thirst and urination
- A borderline or unclear result on a previous test, needing confirmation
- Before any planned surgery, dental procedure or hospital admission, if you're on steroid replacement
- An unrelated illness or infection, which can unmask adrenal insufficiency
- Restarting immunotherapy after a pause for a previous immune reaction
None of these need to wait for your next scheduled cycle — call your care team and ask for the relevant test rather than waiting to see if the symptom passes.
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Why the schedule doesn't stop early
When Do Endocrine Problems Typically Appear, and Why Testing Continues?
Endocrine immune-related reactions don't all appear on the same timeline, which is exactly why testing continues well past your last dose. Thyroid changes tend to appear earliest, adrenal and pituitary effects can appear later and more unpredictably, and new diabetes can appear suddenly at any point, including after immunotherapy has stopped.
| Gland / effect | Typically starts | Why monitoring continues |
|---|---|---|
| Thyroid (thyroiditis) | Weeks 6–20, often within the first few cycles | Early appearance means baseline plus on-cycle testing catches most cases |
| Adrenal gland | Any time during treatment, and sometimes months after stopping | Delayed onset is why testing continues into survivorship |
| Pituitary (hypophysitis) | Weeks 5–36, variable timing | Symptom-triggered testing matters as much as the fixed schedule here |
| Pancreas (new diabetes) | Any time, including after treatment ends | Can appear suddenly — this is why glucose is checked at every visit, not just at baseline |
This variability is exactly why a written schedule — not memory — is the safer way to track your own testing.
Between blood draws
What Should You Track Between Scheduled Hormone Tests?
A monitoring schedule works best alongside a simple habit of noticing change early, especially since many endocrine irAE symptoms build slowly rather than announcing themselves clearly.
- 1
Keep a simple symptom log
Tiredness, weight, appetite, thirst and mood, noted weekly — not just when something feels wrong.
- 2
Save every hormone report
A running record helps your team spot a trend before a single number crosses a threshold.
- 3
Know your baseline numbers
Ask for a copy of your pre-treatment results so any later change is visible to you too.
- 4
Ask "which test, and when next" at every visit
A two-line note in your phone keeps the schedule visible even if a visit runs long.
- 5
Loop in a family member
For adrenal-related testing especially, someone else should know the schedule and the emergency signs.
Testing that keeps pace with treatment
A Monitoring Schedule Your Team Can Be Held To
Patients on immunotherapy get the same structured hormone-monitoring schedule from day one through survivorship.
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Common questions
Hormone Monitoring During Immunotherapy: Your Questions Answered
Which hormone tests should be done during immunotherapy?
The usual starting panel has four parts: thyroid function (TSH and free T4), a morning cortisol level to check adrenal function, blood glucose or HbA1c to screen for new diabetes, and a wider pituitary hormone panel only if symptoms suggest pituitary involvement. All four are simple blood draws, most with same-day or next-day results. Your oncology team decides which apply to you based on your specific immunotherapy drug and any symptoms you report, so treat this as the usual starting point rather than a fixed list for every patient.
How often should each hormone test be repeated?
As a general guide drawn from NCCN and ASCO monitoring guidance, thyroid function and blood glucose are usually checked before every treatment cycle during active immunotherapy — roughly every three to six weeks depending on your regimen — while morning cortisol is checked on a similar rhythm or sooner if symptoms appear. After your last dose, testing continues at a slower pace: roughly every six to twelve weeks through the first year, then every six to twelve months, or sooner if symptoms return. A pituitary panel is added only if it's clinically indicated. Your own oncology team sets your exact schedule based on your specific drug, dose interval and risk factors.
What triggers extra hormone testing between scheduled checks?
Several situations call for a test sooner than your next scheduled check: a new or worsening symptom such as unusual tiredness, weight change, feeling unusually cold, nausea, low blood pressure, palpitations or excessive thirst and urination; a borderline result on a previous test that needs confirming; an upcoming surgery, dental procedure or hospital admission if you're on steroid replacement; an unrelated illness or infection, which can unmask adrenal insufficiency; or restarting immunotherapy after a pause for a previous immune reaction. None of these need to wait for your next cycle — call your care team directly.
Do hormone tests continue after immunotherapy stops?
Yes. Endocrine immune-related reactions don't always appear during active treatment — adrenal and pituitary effects in particular can appear months after your last dose, and new diabetes can appear at any point. Because of this, hormone testing typically continues for at least a year after immunotherapy ends, at a reduced frequency, and then moves to annual screening. If you're on any hormone replacement started during treatment, that testing continues for as long as the replacement does, guided by your endocrinology-linked oncology team.
What should I do if a hormone test comes back abnormal?
An abnormal hormone test on its own is rarely an emergency — it usually means your team will repeat the test, add a confirmatory test such as an ACTH stimulation test, or start clinician-directed hormone replacement at a carefully judged dose. The exception is a result suggesting adrenal insufficiency alongside symptoms like severe weakness, vomiting or confusion, which should be treated as a possible adrenal crisis and taken to the emergency room immediately. In every other case, don't self-interpret the number — bring it to your oncology team so it's read alongside your symptoms and treatment stage.
Can I ask for these hormone tests myself if my care team hasn't ordered them?
Yes — you're entitled to ask, and doing so is reasonable, especially if you have new symptoms or it's been longer than expected since your last check. Bring this schedule to your next visit and ask specifically which of the four core tests are due. Most oncology teams welcome a specific, informed question far more than a vague worry, and a blood test is often the simplest way to confirm or rule out a hormonal cause rather than leaving it unanswered.