Serum Lactose Concentration (Qualitative Milk Protein Allergy Screen)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you experience symptoms like bloating, gas, diarrhea, or abdominal pain after consuming dairy products, even if you don’t suspect a milk allergy. It can also be used to evaluate unexplained digestive discomfort linked to dairy intake.

What to Expect Before the Test

No special preparation is needed for this test. You’ll provide a blood sample, usually drawn from a vein in your arm. If you’re being screened for a milk allergy, your provider may also ask you to avoid dairy products for a short period before testing.

What the Results Mean

The test result will indicate whether lactose is present in your serum. A positive result suggests potential sensitivity to milk proteins, but it doesn’t confirm a full allergy diagnosis. Further testing, like elimination diets or allergy skin tests, may be needed for confirmation.

Common Reasons for Testing

This test is often used as a preliminary screening tool to assess if lactose or milk proteins are contributing to digestive symptoms. It’s not typically used for routine health checks unless symptoms suggest a possible reaction.