Díaz Lab Testing Store › ApoB | Apolipoprotein B | Serum (Quest) Image 1 of 1 ApoB | Apolipoprotein B | Serum (Quest) $57.00 Counts the actual number of harmful cholesterol particles — a more accurate cardiovascular risk predictor than standard LDL. Add To Cart Added! Counts the actual number of harmful cholesterol particles — a more accurate cardiovascular risk predictor than standard LDL. Add-on | Interpretation for Individual Markers $17.00 Add Added!