Diffusion lung capacity shows the state of the gas exchange lung zone. Disorders resulting in a decrease in the diffusion surface area or an increase in its thickness lead to a decrease in oxygen diffusion through the alveolarcapillary membrane. The objective of the study was to assess the peculiarities of diffusion lung capacity in patients with spondylarthritеs depending on the clinical and laboratory data, as well as the anamnestic information. The study involved 58 patients with spondylarthritеs: 39 men and 19 women. The interview considered their past medical history and respiratory complaints. The x-ray stage of spondylarthritеs was determined, as well as the disease activity index BASDAI. Spine mobility was evaluated using tragus-to-wall distance, chest expansion and modified Schober test. Blood tests were taken to determine the Chlamydophila pneumoniae infection markers. Diffusion lung capacity was tested. A decrease in diffusion lung capacity was observed significantly more frequently in the patients with spondylarthritеs and thyroid disorders, this group included only women. The patients with spondylarthritеs and thyroid disorders showed a significant increase in respiratory complaints, namely dyspnea. These peculiarities may be present due to common regulatory mechanisms of lung and thyroid pathology. The patients with spondylarthritеs and the Chlamydophila pneumoniae infection acute phase markers in blood showed normal parameters of diffusion lung capacity.

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