Reverse Transcription-Polymerase Chain Reaction (RT-PCR) is a fairly touchy and unique method beneficial for the detection of uncommon transcripts or for the evaluation of samples available in restricting quantities (1,2). In most instances, when RNA evaluation is required, a qualitative have a look at isn't always sufficient to supply a first-rate solution. A common query is the quantification of precise RNA transcripts and the detection of any variation in their expression stages beneath extraordinary experimental conditions. We have regularly confronted the hassle of detecting poorly expressed transcripts, in addition to that of managing small quantities of precise samples, inclusive of number one hematopoietic cells (3,four) or tumor biopsies from human patients (five-7). When studies are carried out in human number one models or in established and converted cell traces in situations requirings luxurious reagent, evaluation must be done with a sensitive however reliable method because simplest a restrained range of experiments may be run on each sample. A number of protocols and progressed PCR techniques are actually to be had, a good way to be discussed within the present manuscript, but these aren't all without problems available to a preferred laboratory and feature pitfalls together with the benefits for which they have been created. Although reproducibility is usually an vital requirement, intense accuracy won't be: in maximum research the point of interest isn't always to degree minor modifications or the exact range of molecules, however an increase or decrease with the aid of at least 1.2-fold in expression stages. Hence, in spite of the extra accuracy of these days evolved techniques, semi-quantitative methods are nonetheless extensively used and appropriate for many puposes. Here we describe the standard manner, optimized in our laboratory, to assess Bcl-2 ranges with Aldolase A as an internal manage, and all the important controls to make certain a quantitative evaluation. Examples of the analyses of a couple of markers and of the information acquired are proven.