A coverage of 30X means that each individual base will be checked 30 TIMES to guarantee the sequence accuracy. These coding regions represent only 1% of the total DNA information (Genome) and is spread over each chromosome. The advantage is that it is more cost-effective as only a fraction of the Genome is sequenced. The disadvantage is that some mutations hotspots will not be covered resulting in lower accuracy and partial analysis of your health predispositions. We do recommend this first level analysis when buying a family pack ; As individuals will obtain their global risk evaluation, they can then perform Whole Genome Sequencing in case of significant risk to reduce.