I bought these and they taste great. A Mexican buddy of mine at school let me have one and I was hooked. The only problem I had with these is that is was the Aldama brand and not Las Sevillanas but it is still a great tasting Oblea with cajeta and I plan to buy again.
The hook effect and false BFNs. Summarised, the hook effect is when someone continuously gets negative urine and blood tests but are actually pregnant. It happens because hcg levels are too high to register and is common with mothers carrying multiples or on older woman.
(Redirected from Prozone phenomenon). The hook effect or the prozone effect is a false negative result with certain immunoassays due to very high concentrations of a particular analyte.The hook effect mostly affects one-step immunometric assays.ince the antibodies do not bridge between antigens, no agglutination occurs. Because no agglutination occurs, the test is interpreted as negative. In this case, the result is a false negative. The zone of relatively high antibody concentrations within which no reaction occurs is called the prozone or the prezone.