ADH-Antidiuretic Hormone Vasopressin
What is ADH?
Antidiuretic hormone (ADH) or arginine vasopressin (AVP) regulates salt and water balance in the body. An ADH test helps doctors identify the underlying causes behind fluid and salt (electrolyte) imbalances in the body. This test measures the level of ADH in your blood.
The normal range of ADH in the blood is between 1 to 5 pg/mL. A high level often means SIADH. The SIADH can be due to different types of cancer, including lung, brain, bladder, pancreatic, and blood.
A very high level of ADH could be dangerous as it may lead to cerebral oedema and seizures. A moderately high level may mean conditions like HIV, epilepsy, or multiple sclerosis. A low level may indicate diabetes insipidus, a low (very) sodium level in the body, or excessive water consumption.
Why is ADH done?
This test is often conducted when you have symptoms suggesting dehydration, variable sodium levels or even lung cancer.
Interpreting ADH results
High levels of Anti Diuretic Hormone could mean that you may be suffering from brain tumor, lung infection, stroke or central nervous system tumor. Low levels of ADH might mean that you are suffering from primary polydipsia, pituitary damage or central diabetes insipidus.