What Is Pituitary Profile Test

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If your symptoms lead your doctor to believe that you might have a pituitary tumor, the first step is to get your medical history to learn more about your symptoms and to check for possible risk factors. Your doctor may ask about your family history of tumors or other problems to see if you might have an inherited genetic syndrome, such as multiple endocrine neoplasia, type I (MEN1).

Your doctor will also examine you to look for possible signs of a pituitary tumor or other health problems. This will probably include exams to look for vision or nervous system problems that could be caused by a tumor.

If a pituitary tumor is strongly suspected, your doctor may refer you to an ophthalmologist (eye doctor) to check your vision more carefully, as pituitary tumors can damage nerves leading to the eyes. The most common test is to measure how well you can see. The doctor may also test your field of vision (or visual fields). Pituitary tumors can press on parts of the optic nerves (the nerves leading from the eyes to the brain). This can lead to the loss of peripheral vision, meaning that you can't see things off to the side without actually looking right at them. Eye doctors have special instruments that can test for this.

You might also be referred to other doctors, such as an endocrinologist (a doctor who treats diseases in glands that secrete hormones) or a neurosurgeon (a doctor who uses surgery to treat brain and pituitary tumors), who might order other tests.

If the levels are slightly increased, an oral glucose tolerance test is often done to be sure. You'll be asked to drink a sugary liquid, and then the levels of GH and blood sugar (glucose) will be measured at certain times. The normal response to suddenly taking in so much sugar is a drop in GH levels. But if the GH levels stay high, a pituitary tumor is likely the cause.

Blood prolactin levels can be measured to check for a prolactinoma. Blood levels of other hormones might also be checked, as other types of pituitary tumors (and other conditions) can also sometimes cause prolactin levels to rise.

Diabetes insipidus can develop if a pituitary tumor grows large enough to damage the part of the pituitary that stores the hormone vasopressin (also known as antidiuretic hormone, or ADH), which leads to too much water being lost in the urine. This condition can also have other causes, including surgery to treat pituitary tumors or other tumors near the pituitary gland.

In many cases, the cause of diabetes insipidus can be determined with tests that measure the amount of urine made over a 24-hour period, sodium and glucose levels in the blood, and osmolality (total salt concentration) of the blood and urine.

If these test results are not clear, then a water deprivation test may be done. In this test, you are not allowed to drink fluids for several hours, sometimes overnight. After the water restriction, your blood and urine osmolality and your blood sodium level will be checked. If your pituitary isn't making enough vasopressin, you'll continue to make urine even though you aren't taking in any fluid. This will cause your urine osmolality to remain low, as opposed to rising as it normally would if your urine was being concentrated. You may also be given an injection of vasopressin to see if this corrects the problem.

Imaging tests use x-rays, magnetic fields, or other means to create pictures of the inside of your body. You might have one or more of these tests to look for pituitary tumors or to see if they have grown into nearby structures. In some cases, an imaging test of the head done for another reason may show a pituitary tumor.

This test is very helpful for looking at the brain and spinal cord, and it's considered the best way to find pituitary tumors. MRI images are usually more detailed than those from CT scans (see below). They can show macroadenomas of the pituitary gland, as well as most microadenomas. MRI might not detect very small microadenomas, although many of these can now be seen with newer MRI machines, which have stronger magnets and can show even more detail.

A CT scan uses x-rays to create detailed cross-sectional images of part of your body. CT scans can find a pituitary adenoma if it's large enough, but MRI scans are used much more often to look at the brain and pituitary gland.

In diagnosing cancers and tumors in most other parts of the body, imaging tests and blood tests may strongly suggest a certain type of tumor, but a biopsy (removing a sample of the tumor to examine under a microscope) is often the only way to be sure of the diagnosis. In many cases, doctors won't treat a tumor until a biopsy has been done.

When pituitary tumors are removed by surgery, they're looked at under a microscope to determine their exact type. Special stains may be used on the tumor to color the areas making hormones, and other lab tests may be done as well to help classify the tumor.

Snyder PJ. Clinical manifestations and diagnosis of gonadotroph and other clinically nonfunctioning pituitary adenomas. UpToDate. 2022. Accessed at -manifestations-and-diagnosis-of-gonadotroph-and-other-clinically-nonfunctioning-pituitary-adenomas on July 16, 2022.

The first step in diagnosing a pituitary tumor is often a blood test to check for hormone imbalances. Because the pituitary gland plays an important role in hormone production, the presence of a tumor can lead to an imbalance of certain hormones in the body.

Other pituitary tumors, including nonfunctional adenomas may grow large enough to inhibit the production of hormones by the pituitary gland. In these cases, hormone testing may show abnormally low amounts of ACTH, GH, prolactin, TSH, LH, or FSH.

An MRI is a test that uses strong magnetic fields to produce pictures of the inside of your body. These pictures can show the difference between normal and diseased tissue. MRI makes better images of organs and soft tissue than other scanning techniques, such as CT or X-ray. MRI scans do not involve the use of radiation.

We can confirm that a tumor has been entirely removed while patients are still under anesthesia. With this enhanced precision, we have improved outcomes for our patients, reducing the need for second surgeries.

Initially, your GP may perform some basic pituitary hormone function tests. The hormones that can be tested via a simple blood test include: cortisol, thyroid, prolactin, oestrogen, testosterone and growth hormone.

How often is the test done: Initial diagnosis and for review purposes. Varies, depending on your clinic/consultant but at least annually when taking when Octreotide/Lanreotide or similar medication to control growth hormone output.

How often is the test done: Diagnosis of GH deficiency. Post-operative: to assess pituitary function. Many centres will now use synacthen test post operatively to assess cortisol function and reserve IST for assessment of GH

How is the test given: Patient deprived of any fluids for up to approximately 8 hours. Blood is taken, weight checked and urine tested at regular intervals. If urine volume excessive and/or significant weight loss test is discontinued and Desmopressin given

If you are a young adult then your doctors and nurses should communicate directly to you rather than through your parents. It is important that you feel treated as a young adult rather than as a child, that you feel they are approachable, put you at ease, provide reassurance, listen to concerns, are well-informed and are willing to answer questions.

Hannah is a freelance writer with experience writing medical and health content for patients, health care professionals, obstetricians, gynecologists, and midwives in the specialist area of stem cell processing and research. Hannah has previous journalism experience writing for wedding publications, covering both consumer and trade divisions. You can follow Hannah on

Dr. Angelica Balingit is an ABMS board certified internal medicine physician. She has vast experience in treating adult conditions in the hospital, outpatient clinic, assisted living facility, home, and via telemedicine. Her special interests include hypertension, diabetes, arthritis, and anemia.

The pituitary gland is a tiny, pea-sized gland at the base of the brain. It is part of the endocrine system and helps control the release of hormones from other endocrine glands, such as the adrenal glands, sex glands, and thyroid. It also releases hormones affecting body tissues, such as breast milk glands and bones.

Some pituitary tumors can cause the pituitary gland to make excessive amounts of hormones, while others can cause the pituitary gland to make too little. Imbalances in hormones can cause various problems in many body systems.

In this article, we examine blood tests for pituitary tumors. We discuss what the blood tests look for, the types of blood tests for different tumors, and other tests doctors may use to diagnose pituitary tumors.

If a doctor suspects a person has a lactotroph adenoma, they will likely order a prolactin test to measure prolactin levels in the blood. They may also check blood levels of other hormones, since other pituitary tumor types may also cause rises in prolactin levels.

In adults, high GH levels cannot cause arm and leg bones to grow further, so people do not grow taller. However, high GH levels can make the hands, feet, and skull bones grow, which causes a condition known as acromegaly.

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