Introduction: Correlation of Single breath count (SBC) with Peak expiratory flow rate (PEFR) in pediatric age group is not a widely studied topic. SBC can be a reliable potential alternative to PEFR, the latter being effort dependent and thus difficult to measure in the said age group. One minute count (OMC) is a new concept that has been used in the study at our institute. OMC is the maximum number count in 1 minute by the subject and it can be an effective alternative in children who can't count rapidly and efficiently in a single breath. Aims and objectives: To study correlation of Peak expiratory flow rate (PEFR) with Single breath count (SBC) and One minute count (OMC) in healthy asymptomatic children of third and fourth standards from a school in Mumbai. Materials and Method: PEFR readings were obtained using a Peak flowmeter, while SBC and OMC were done manually. Subjects were first given a demonstration using a Peak flow meter and the readings were then recorded by trained personnel. For SBC and OMC readings, the subjects were shown a video demonstrating the procedure and then readings were taken. Best of 3 readings was considered for all 3 parameters. Correlation of PEFR with SBC and OMC was done with help of Pearson's correlation coefficient. Linear regression analysis of the data was also done. Results: Mean age of the study group was 8 years. Mean height was 1.18 meters. Boys were 50.9 of the total. SBC was easy to perform. By Pearson's correlation, all 3 parameters were strongly correlated, with p – value at 0.01. On linear regression, all 3 tests had co-linear outcome. They are comparable. The drawback of the study was, it was subject dependent; depending on how rapidly and efficiently the child can count. A video demonstration of the proper procedure helped us overcome the problem. Conclusion: SBC can be an equally effective screening tool for pediatric respiratory functions in healthy children; as reliable as Peak flowmetry. OMC can be an effective alternative in cases where SBC can't be performed. Further studies in asthmatic children are warranted to learn its implications in disease state.

Keywords: PEFR; SBC; One minute count; Asthma manuscript.