Aim: The aim of this research is to examine the characteristics of patients who are referred to the periodontal specialist at the Specialist Clinic of the University Hospital Centre Osijek. The characteristics studied are gender, age, reason for referral, smoking status, medications, allergies, other diseases, COVID vaccination, oral condition, bone loss, periodontal aspects, diagnosis, and additional diagnosis. Participants and methods: Participants were adult patients referred to a periodontal specialist, both male and female. A sample of 100 patients was taken. The study was conducted based on previously collected patient data. Ethical approval was obtained from the Ethics Committee of the University Hospital Centre Osijek, whose approval allowed access to patient records. Information was collected from these records, including gender, age, reason for referral, smoking status, medications, allergies, other diseases, COVID vaccination, oral condition, bone loss, periodontal aspects, diagnosis, and additional diagnoses. Statistical analysis was conducted on the collected data. Results: The sample of participants in this study consisted of 70% males and 30% females. The age of the participants ranged from 18 to 80 years. Periodontitis was diagnosed in 76% of the patients, while gingivitis was diagnosed in 24% of the patients. Almost all patients (95%) were referred by their dentist citing tooth mobility, bleeding, and gingival recession (42%) as the main reasons for referral. All patients had had their oral cavities restored with fillings and/or prosthetics, and 61% had a healthy orthodontic aspect. The majority were non-smokers (53%), had no allergies (88%), did not suffer from any other diseases (64%), and were not on any prescribed therapy (65%). All patients with a diagnosis of periodontitis had recorded bone loss, and all required initial therapy, with positive findings on the API, PBI, and PD. Patients diagnosed of gingivitis had positive findings on the API and PBI. Conclusion: A high prevalence of periodontitis was observed in patients referred to a periodontal specialist. According to the diagnoses of gingivitis and periodontitis, there was no statistically significant prevalence of allergies, medications, other diseases, or orthodontic anomalies. The restored oral cavity confirms previous poor oral hygiene that preceded the development of gingivitis and periodontitis. In addition, men were significantly more likely to be referred to a periodontal specialist, suggesting that women are less attentive to preventive care.