| ENCYCLOPEDIA INDEX |
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| 1 2 5 A B C D E F G H I J K L M N O P Q R S T U V W X |
Lactose tolerance test |
| Overview Risks Results |
| Normal Values: |
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In the breath test, a peak rise in hydrogen content of 12 parts per million over the fasting (pre-test) level is considered positive. In the blood test, a rise in plasma glucose of more than 30 mg/dl within 2 hours of ingesting the lactose is considered normal. A rise of 20-30 mg/dl is inconclusive. A rise of less than 20 mg/dl is abnormal. |
| What abnormal results mean: |
An abnormal test should be followed by a glucose tolerance test to exclude an abnormality in absorption of glucose before concluding that there is a lactase deficiency. |
Blood test |
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