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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Allergy & Intolerance

Lactase Genotyping

Lactase Genotyping provides a definitive genetic answer about your ability to digest lactose. This one-time test guides personalised dietary decisions.

What It Measures

This test analyses specific genetic variants near the LCT gene that determine whether your body continues to produce lactase into adulthood or gradually reduces production. It does not measure current enzyme activity.

Why It Matters

Knowing your lactase genotype provides a definitive answer about your genetic capacity to digest lactose, guiding dietary decisions and avoiding unnecessary restrictions.

When to Test

Consider this test if you experience digestive symptoms after consuming dairy products or want a definitive genetic answer about lactose tolerance.

Symptoms

Low Levels

A lactase-persistent genotype means you are genetically able to digest lactose throughout life and are unlikely to have primary lactose intolerance.

High Levels

A lactase non-persistent genotype indicates genetic predisposition to reduced lactase production in adulthood, which may cause bloating, gas, diarrhoea, and cramps after consuming dairy.

Lifestyle Tips

If you have lactase non-persistence, you may still tolerate small amounts of dairy, especially fermented products like yoghurt and aged cheese. Lactase supplements before meals can help. Ensure adequate calcium intake from alternative sources.

Frequently Asked Questions

Is lactase genotyping the same as a lactose intolerance test?
Not exactly. Genotyping reveals genetic predisposition, while a hydrogen breath test measures current ability to digest lactose.
Can lactose tolerance change with age?
Yes. People with a non-persistent genotype typically produce decreasing lactase from childhood through adulthood.
Does this test require fasting?
No. Since this is a DNA test, fasting is not required and dairy consumption does not affect the result.