Laboratory tests usually examine a sample of your urine, blood, or body tissues. A doctor studies the test samples to determine whether the results fall within the normal range. Since ‘normal’ varies ...

3. Try to avoid alcohol. This can negatively affect your sleep and make sleep apnea worse. 4. If you're doing the test at a sleep lab, make sure to bring: -- Your pajamas.

Antinuclear Body Test Procedure A lab tech will take a sample of your blood -- usually from a vein in your arm. They'll tie a band around the upper part of your arm to make your vein fill with ...