PATIENT PREPARATION FOR BLOOD TESTS
One of the most important factors in determining the accuracy and reliability of your lab test is you, THE PATIENT. After all, it is a sample from your body (blood, urine, or some other specimen), on which the test will be performed. Therefore, it is essential that you do the following to ensure that the results will be useful and interpreted correctly by your doctor:
It should be noted that many tests require no special preparation. But for those that do, be certain to adhere to the instructions provided.
VARIOUS TEST PREPARATIONS:
Please note : For fasting patient, one can have as much water as he/she wants, but no other drinks or food intake is allowed
(1) LIPID PROFILE
Patient should fast for 12 hours before blood collection. Fasting should be no food or drink except for water.
(2) BLOOD GLUCOSE
Fasting blood sugar (FBS)
For a fasting blood sugar test, do not eat or drink anything other than water for at least 8 hours before the blood sample is taken.
If you have diabetes, your doctor may ask you to wait until you have had your blood collected before taking your morning dose of insulin or diabetes medicine.
2-hour Postprandial (post lunch) blood sugar:
For a 2-hour postprandial test, you need to have your blood collected exactly 2 hours after a regular lunch. e.g. If Mr. Shah has started his lunch at 12.00 noon he needs to complete his blood collection at 2.00 pm. Mr. Shah will require to reach the lab at 1.50 pm, i.e. 10 minutes early to avoid registration delays. Also Mr. Shah cannot have any food between 12.00 noon and 2.00 p.m. time period. He can have water and his usual medicines.
Random blood sugar (RBS):
No special preparation is required before having a random blood sugar test.
(3) GLUCOSE TOLERANCE TEST (NON-PREGNANT)
Patient should be fasting for 8 hours (no food or drink, except for water). A fasting blood specimen will be drawn and tested. You will then be given a glass of glucose drink. Your blood will be drawn once each hour or each half hour after you finish the drink. The number of hours may vary from 2 to 4.
(4) PRENATAL GLUCOSE TOLERANCE TESTS
For our pregnant patients your physician may order glucose tolerance testing during your pregnancy.
50 GRAM 1 HOUR GLUCOSE TOLERANCE TEST (GESTATIONAL DIABETES SCREEN)
1. No special patient preparation is required.
2. This test is done without regard to the time of day or time of last meal. You do not need to fast before this test is given.
3. You will be given a glucose drink and your blood will be drawn one hour after you finish the drink.
4. Please allow at least 1 ½ hours for this test to be completed.
100 GRAM 3 HOUR GLUCOSE TOLERANCE TEST (GESTATIONAL DIABETES)
1. This test should be performed in the morning after an overnight fast of at least 8 hours and after at least 3 days of unrestricted diet and activity.
2. A blood specimen will be drawn and tested.
3. You will then be given a glucose drink.
4. Your blood will be drawn once each hour after you finish the drink for three hours.
5. This test will be completed in 4 hours. Hence be prepared to spend this time at the lab.