Lactose Tolerance Test

This test measures how well your body is able to absorb lactose and is done when lactose intolerance is suspected. The test is done by giving a lactose (milk sugar) load by mouth after a period of fasting.

PREPARATION FOR TEST

Nothing to eat or drink or any strenuous exercise is recommended for 8 hours prior to the test.

NORMAL FINDINGS

Adults and Children: Rise in blood glucose levels of >20-30 mg/dl (1.1-1.7 mmol/L) above fasting level

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.

MEANING OF TEST

Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.

OBTAINING THE TEST RESULTS

It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.