Background: Objective and reliable diagnosis of bronchial asthma is usually done by carrying out spirometry. The parameters assessed include Forced Expiratory Volume in One Second (FEV1), Forced Vital Capacity (FVC) and FEV1/FVC ratio. FEV1/FVC ratio reflects the degree of bronchial obstruction. Pulse oximeter not invasive, simple, user friendly, portable and affordable device used in the measurement of blood oxygen concentration. It is very useful in assessing the need for oxygen administration and monitoring of asthmatic patients on emergency admission for acute exacerbations. Making diagnosis of bronchial asthma based on clinical symptoms without carrying out spirometry and pulse oximeter could lead to misdiagnosis and poor assessment of bronchial asthma respectively. Therefore, this study aimed at carrying out a survey of levels of oxygen saturation and spirometric parameters among suspected asthmatics referred to the respiratory clinics in the NDUTH. Methodology: This was an observational cross-sectional descriptive study carried out among suspected asthmatics referred to the Chest Clinic of the NDUTH. A total of 150 suspected bronchial asthmatics referred to the Chest Clinic of the NDUTH between January 2017 and December 2020 were recruited for the study.The research was done in the cardio-respiratory laboratory of the department of internal medicine, NDUTH. Global Initiative for Asthma (GINA) criteria was used to make diagnosis of asthma so all participants underwent spirometry and pulse oximeter in the cardio-respiratory laboratory of the department of internal medicine. Data was documented and Statistical Package for Social Sciences (SPSS) version 22 was used to analyze the data. Descriptive statistics was performed for socio-demographic characteristics while Pearson’s correlation was used to compare spirometric parameters and levels of oxygen saturations among the participants. A p-value of less than or equal to 0.05 was considered statistically significant for all relevant tests. Results: The study participants were more in the age range of 18-44 years, males had more participants than females. Fifty seven constituting 38.2% of the study subjects had FEV1 /FVC ratio % predicted of <0.75, 59 (39.2%) had bronchodilator reversibility of >12% and obstructive spirometric pattern, 139 (93.92%) had oxygen saturation (SPO2) of >92% while 9 (6.08%) had oxygen saturation (SPO2) of < 92%. The correlation between oxygen saturation and FEV1, FVC and FEV1 /FVC was statistically significant. Conclusion: Only a proportion of the suspected asthmatics were confirmed by spirometry and correlation between oxygen saturation and FEV1, FVC and FEV1 /FVC among the participants was statistically significant.