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You had a hormone function test using a catheter.

In the body there are various glands that produce hormones. Hormones are important messengers. They carry information between various organs. In this way, hormones control many bodily functions.

A hormone function test can determine what volume of specific hormones are being produced. To do this, for instance, the hormone content in certain bodily fluids such as blood or urine can be tested. Hormone production is subject to various factors such as the time of day, certain substances, and situations. In some function tests these factors are used to stimulate or restrict hormone production. So certain substances may be administered.

You had blood taken using a catheter. A catheter is a thin tube. This tube is inserted into a blood vessel in the groin or arm, and pushed further in. Various instruments can be pushed at the front of the tube. The test involves pushing a catheter through the blood vessels to particular sites in the body. In the process, X-ray images can be taken. The catheter is visible in the X-ray images. Contrast agents can be administered through the catheter into particular blood vessels. A contrast agent is a substance that spreads inside the blood vessels. The blood vessels with contrast agent can then be seen with particular clarity on the X-ray image. The X-ray images can be used to push the catheter precisely to certain sites in the body. Blood can then be taken through the catheter at those sites. This method helps find out whether too much hormone is being produced at those places in the body.