Lab tests play an important role in your health care. They help your doctor make a diagnosis or treatment decisions. But they may not provide all of the information that your doctor needs. Your doctor will not usually make a decision or diagnosis based only on the results of a lab test, unless the test results are...

What are outpatient services? Outpatient services are medical procedures or tests that can be done in a medical center without an overnight stay. Many procedures and tests can be done in a few hours. Outpatient services include: Wellness and prevention, such as counseling and weight-loss programs. Diagnosis, such as lab...

Discusses test used to check your heart and coronary arteries. Covers reasons cardiac catheterization is done. Looks at how to prepare. Explains how the test is done in the cardiac catheterization laboratory (cath lab) by a cardiologist. Covers risks.

Looks at assessments done to discover problems like depression, schizophrenia, Alzheimer's disease, learning disabilities, or obsessive-compulsive disorder. Covers what is done, including an interview, physical exam, lab tests, and written or verbal tests.

A Pap test is done to look for changes in the cells of the cervix. During a Pap test, a small sample of cells from the surface of the cervix is collected by your doctor. The sample is then spread on a slide (Pap smear) or mixed in a liquid fixative (liquid-based cytology) and sent to a lab for examination under a...

Methamphetamine is a powerful stimulant that's similar to amphetamine. It is sometimes prescribed to treat ADHD or obesity. The illegal form of this drug is usually called meth. It may also be called crystal meth, speed, ice, crystal, glass, or chalk. It's often made in home labs from cheap, sometimes toxic ingredients...

During in vitro fertilization (IVF), eggs and sperm are brought together in a lab to allow the sperm to fertilize an egg. With IVF, you can use any combination of your own eggs and sperm and donor eggs and sperm. After IVF, one or more fertilized eggs are placed in the uterus. Ovarian stimulation and egg retrieval. To...

Describes various sleep studies used to diagnose sleep disorders. Discusses problems like snoring, sleep apnea, insomnia, and narcolepsy. Covers common sleep studies, including polysomnograms, multiple sleep latency tests, and the maintenance of wakefulness test.

Discusses test that evaluates sperm to see if there are fertility problems or if a vasectomy worked. Covers how the test is done and how to prepare. Discusses what results may mean. Lists factors like medicines or activities that may affect the test.

Discusses test to check level of potassium (K) in urine. Includes info on what affects potassium levels in the body such as kidney function, blood pH, and hormones. Explains how and why test is done. Covers what results mean.

A test for calcium in urine is a 24-hour test that checks the amount of calcium that is passed from the body in the urine. Calcium is the most common mineral in the body and one of the most important. The body needs it to build and fix bones and teeth, help nerves work, make muscles squeeze together, help blood clot...

A chloride test measures the level of chloride in your blood or urine. Chloride is one of the most important electrolytes in the blood. It helps keep the amount of fluid inside and outside of your cells in balance. It also helps maintain proper blood volume, blood pressure, and pH of your body fluids. Tests for sodium...

The phosphate urine test measures the amount of phosphate in a sample of urine collected over 24 hours (24-hour urine test). Phosphate is a charged particle (ion) that contains the mineral phosphorus. The body needs phosphorus to build and repair bones and teeth, help nerves function, and make muscles contract. Most...

An amylase test measures the amount of this enzyme in a sample of blood taken from a vein or in a sample of urine. Normally, only low levels of amylase are found in the blood or urine. But if the pancreas or salivary glands become damaged or blocked, more amylase is usually released into the blood and urine. In the...

The uric acid urine test measures the amount of uric acid in a sample of urine collected over 24 hours. Uric acid is made from the natural breakdown of your body's cells. It's also made from the foods you eat. Your kidneys take uric acid out of your blood and put it into urine so that it can leave your body. But if your...

Catecholamines (say "kat-uh-KOH-luh-meens") are hormones made mostly by your adrenal glands as a reaction to stress. When you feel stressed, these hormones increase heart rate, blood pressure, breathing rate, muscle strength, and mental alertness. They also lower the amount of blood that goes to the skin and intestines...