There are two kind of allergy tests;
1) In vitro; this is a blood test which identifies the allergen.
2) In vivo; this is skin test and multiple allergen are injected on the skin to see the reaction.
Both have equally good test. But skin test may be slightly more specific and sensitive than the blood test (chance of false positive are less).
Reading of 928 CO2 PPM is in normal range (the range is CO2 0 to 2550 PPM). So no problem in that area.
Avoidance of indoor allergens is important.
a) Pets need to be removed from home (if you have any).
b) Control of indoor humidity may provide the best avenue for dust mite and mold abatement. Vent Check would help in it.
c) Cockroach control
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