These questions and answers were primarily derived from the Harper University Hospital, web site. They are located in the Detroit, Michigan area.

What are the routine tests before surgery?
Certain basic tests are done prior to surgery: a Complete Blood Count (CBC), Urinalysis, and a Chemistry Panel, which gives a readout of about 20 blood chemistry values. Often a Glucose Tolerance Test is done to evaluate for diabetes, which is very common in overweight persons.

All patients but the very young get a chest X-ray and an electrocardiogram. Women may have a vaginal ultrasound to look for abnormalities of the ovaries or uterus. Many surgeons ask for a gallbladder ultrasound to look for gallstones.

Other tests, such as pulmonary function testing, echocardiogram, sleep studies, GI evaluation, cardiology evaluation, or psychiatric evaluation, may be requested when indicated.

What is the purpose of all these tests?
An accurate assessment of your health is needed before surgery. The best way to avoid complications is to never have them in the first place.

It is important to know if your thyroid function is adequate since hypothyroidism can lead to sudden death post-operatively.

If you are diabetic, special steps must be taken to control your blood sugar.

Because surgery increases cardiac stress, your heart will be thoroughly evaluated.

These tests will determine if you have liver malfunction, breathing difficulties, excess fluid in the tissues, abnormalities of the salts or minerals in body fluids, or abnormal blood fat levels.

Why do I have to have a GI Evaluation?
Patients who have significant gastrointestinal symptoms such as upper abdominal pain, heartburn, belching sour fluid, etc., may have underlying problems such as a hiatal hernia, gastroesophageal reflux or peptic ulcer.

For example, many patients have symptoms of reflux. Up to 15% of these patients may show early changes in the lining of the esophagus, which could predispose them to cancer of the esophagus.

It is important to identify these changes so a suitable surveillance or treatment program can be planned.

Why do I have to have a Sleep Study?
The sleep study detects a tendency for abnormal stopping of breathing, usually associated with airway blockage when the muscles relax during sleep. This condition is associated with a high mortality rate.

After surgery, you will be sedated and will receive narcotics for pain, which further depress normal breathing and reflexes. Airway blockage becomes more dangerous at this time.

It is important to have a clear picture of what to expect and how to handle it.

Why do I have to have a Psychiatric Evaluation?
The most common reason a psychiatric evaluation is ordered is that your insurance company may require it. Most psychiatrists will evaluate your understanding and knowledge of the risks and complications associated with weight loss surgery and your ability to follow the basic recovery plan.

What impact do my medical problems have on the decision for surgery, and how do the medical problems affect risk?
Medical problems, such as serious heart or lung problems, can increase the risk of any surgery. On the other hand, if they are problems that are related to the patient's weight, they also increase the need for surgery.

Severe medical problems may not dissuade the surgeon from recommending gastric bypass surgery if it is otherwise appropriate, but those conditions will make a patient's risk higher than average.

If I want to undergo a gastric bypass, how long do I have to wait?
After you have attended one of our bimonthly seminars, a one-on-one consultation can be scheduled with one of our surgeons within a week or two. Once a patient is seen, if the surgeon and patient agree it is appropriate, the operation can usually be scheduled within 4 to 8 weeks.

The time before surgery is required to obtain the appropriate preoperative tests and insurance authorization.

What can I do before the appointment to speed up the process of getting ready for surgery?