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Intraoperative PTH monitoring: how the surgeon knows the gland is out | CION Cancer Clinics
Intraoperative PTH monitoring means measuring parathyroid hormone in your blood before and minutes after the overactive gland is removed. Because the hormone clears quickly, a sharp fall tells the surgeon the right gland has come out and the operation can end. This page explains what happens while you are asleep, what the result patterns mean, and what the test cannot tell you. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What is intraoperative PTH monitoring?
- What happens to the blood samples during the operation?
- What can the hormone result tell the surgeon?
- Words you will see on the operation note
- Where does the test fall short?
- Four things families ask about the hormone test
- Common questions about PTH monitoring during surgery
The short answer
What is intraoperative PTH monitoring?
During a parathyroid operation, the surgeon takes blood samples before and after the overactive gland is removed and measures the parathyroid hormone (PTH) in each one. If the level falls sharply within minutes, the team has good evidence that the gland causing the trouble has come out, and the operation can end without a search for the other glands.
Why this changed parathyroid surgery
PTH does not last long in the blood, so once the gland making too much of it is gone, the level drops fast. The older approach was to open the neck widely and look at all four glands. With a scan pointing to one gland and a hormone check confirming it, many operations are now done through a small cut on one side. The hormone check is what gives the surgeon the confidence to stop.
Who it is not used for
If parathyroid cancer is suspected, the surgeon removes the gland with the tissue around it whatever the hormone does. If all four glands are known to be overactive, as often happens with long-standing kidney failure, the operation is planned as a full exploration and the test adds less.
Not every hospital uses this test. Ask your centre whether they do, and if not, how they will decide the operation is complete.While you are asleep
What happens to the blood samples during the operation?
The starting sample
Once you are under anaesthesia and before the surgeon touches the gland, a sample is taken. This is the baseline. Many teams take a second baseline just before the gland is lifted out, because handling a gland can make the level jump for a short while.
The gland comes out
The surgeon frees the gland and removes it. It is sent to the pathology lab straight away. From this moment the clock starts, because the samples that matter are timed from removal.
Timed samples afterwards
Blood is drawn again at set points in the minutes after removal. Each sample goes to the testing machine and a result comes back to the theatre while the surgeon waits with the wound open but everything settled.
The decision
If the fall meets the rule your team uses, the wound is closed and the operation ends. If the fall is not enough, the surgeon looks for a second overactive gland on the same side, then the other side, before closing.
Not sure whether this applies to you?
Ask an oncologistReading the result
What can the hormone result tell the surgeon?
Four patterns cover most operations. Your team will tell you afterwards which one they saw.
A clear fall
The level drops to well under the starting figure and heads towards the normal range. This is the pattern the team hopes for. It means the gland removed was very likely the only one overactive.
What usually follows
- The wound is closed
- Calcium is checked the next morning
A fall that is not enough
The level drops, but not by as much as the rule needs. This often means a second gland is also overactive and the scan showed only one of them. The surgeon keeps looking rather than closing.
A slow fall
Some people clear the hormone slowly, especially when the kidneys are not working well. The team may wait for a later sample before deciding, instead of opening up the rest of the neck straight away.
No fall at all
The tissue removed may not have been the overactive gland. A lymph node or a thyroid nodule can look similar in the neck. The search continues, and the pathology lab may be asked to look at the tissue at once.
This is the situation the test exists to catch. Without it, the problem would show up only in the blood tests afterwards.On your report
Words you will see on the operation note
- PTH
- Parathyroid hormone. It raises the calcium in your blood by drawing it out of bone. Too much of it, for too long, is what the operation is treating.
- Baseline
- The hormone level measured at the start of the operation, before any gland is handled. Every later sample is compared against it.
- Adenoma
- A non-cancerous overgrowth of one gland. It is the most common cause of high calcium from the parathyroids, and the reason a one-gland operation is possible.
- Hyperplasia
- All four glands enlarged and overactive together. It usually needs more than one gland removed, and the hormone test is read differently.
- Frozen section
- A quick look at the removed tissue under the microscope during the operation. It confirms the tissue is parathyroid. It does not say whether the gland was the overactive one.
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Being straight with you
Where does the test fall short?
The hormone check is a strong signal, not a promise. It can miss a second overactive gland when the first one was so large that removing it makes the level fall enough to pass the rule. It can also raise a false alarm, when handling the gland pushes the starting level up and the fall afterwards looks smaller than it really is.
What a good result does not tell you
A clear fall in theatre says the overactive gland is out. It does not say what your calcium will do over the following months. That is checked with ordinary blood tests at your follow-up visits. It also does not say whether the gland was cancer. That comes from the full pathology report a few days later.
What this page cannot tell you
It cannot tell you whether your own operation will use the test, or which rule your surgeon applies. Teams use slightly different thresholds and timings. Ask before the day, and ask again at the follow-up what the numbers were.
Whether you should have surgery at all is a decision for you and your treating team. This page explains one tool they may use during it.Commonly believed
Four things families ask about the hormone test
"If the hormone fell in theatre, the problem is gone for good."
The fall is good evidence for that day. It is not a long-term result. A small number of people have a second gland become overactive years later, which is why calcium is still checked at follow-up visits even after a textbook operation.
"With this test the surgeon does not need a scan."
The scan and the test do different jobs. The scan tells the surgeon where to look before the cut is made. The hormone test tells the surgeon whether to stop once a gland is out. Most teams want both.
"A bigger operation is safer, because everything gets checked."
Looking at all four glands means handling all four, and working close to the voice nerve on both sides. That carries its own risks. For one overactive gland, a smaller operation with a hormone check is the usual choice. Your team will explain which suits you.
"If the hospital does not use the test, they are cutting corners."
Some experienced centres rely on good scans and a careful look at the gland itself. The test is a help, not a rule. What matters is that the surgeon can explain how they will know the operation is complete.
Questions we are asked
Common questions about PTH monitoring during surgery
Does the test make the operation longer?
A little. The surgeon waits for the timed samples to be run before closing, which adds some minutes to the anaesthetic. Set against that, a good result often lets the team avoid opening the other side of the neck, so the whole operation is usually shorter.
What happens if the hormone does not fall?
The surgeon keeps looking. They check the other gland on the same side, then the other side of the neck, and may ask the pathology lab to confirm what has been removed. You are asleep throughout, and your surgeon will explain afterwards.
Does every hospital in Hyderabad offer this?
No. It needs a fast hormone assay and a lab willing to turn results round in minutes. Some centres have it in theatre, some send samples to a nearby lab, and some do not use it. Ask your surgeon directly. If they do not use it, ask how they will decide the operation is complete.
Is this the same as a frozen section?
No. A frozen section is the pathologist looking at the removed tissue under a microscope during the operation to confirm it is parathyroid and not a lymph node. The hormone test measures what the rest of your body is doing once that tissue is out. Some teams use both.
I have kidney disease. Does the test still work?
It can, but it is harder to read. Weak kidneys clear the hormone slowly, so the fall takes longer and a sample at the usual time may look poor. Your surgeon will know this from your blood tests and may take a later sample. Put your kidney reports in the file before the day.
If the hormone fell well, will I still need calcium tablets?
Possibly. A sharp fall in the hormone can make calcium dip for a few days while the remaining glands wake up, so many people go home on calcium tablets for a short time regardless. Your team will decide from the calcium blood test the next morning, and tell you when to stop.
Can the test tell whether the gland was cancer?
No. Cancer of the parathyroid is rare and is diagnosed by the pathologist looking at the whole gland over several days, not by a hormone level. If cancer was suspected before the operation, the surgeon removes the gland with the surrounding tissue whatever the hormone result shows.
What should I ask my surgeon before the day?
Ask whether they use hormone monitoring, what rule they apply, and what they will do if the fall is not enough. Ask whether a frozen section is also planned. Afterwards, ask what the starting and final numbers were and keep them with your records. They are useful if calcium ever rises again.
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Sources
- NICE — Hyperparathyroidism (primary): diagnosis, assessment and initial management (NG132)
- NHS — Hyperparathyroidism
- National Cancer Institute — Parathyroid Cancer Treatment (PDQ) - Patient Version
- Macmillan Cancer Support — Parathyroid 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.
Keep reading
Related pages
Parathyroidectomy: What the Operation InvolvesThe whole operation, from the cut to going homeLocalisation Scans Before Parathyroid SurgeryThe scans that tell the surgeon where to look firstMinimally Invasive ParathyroidectomyThe small-cut operation that this test makes possiblePersistent and Recurrent HyperparathyroidismWhat happens when calcium stays high or comes backAnaesthesia for Cancer SurgeryWhat being asleep for the operation involves
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