ACPA	Anti-citrullinated protein antibodies
ANA	Antinuclear antibodies
ANCA	Anti-neutrophil cytoplasmic antibodies
ANTI-SSA (Ro/52)	Anti-Sjögren’s-syndrome-related antigen A antibodies
ANTI-SSB (La)	Anti-Sjögren’s-syndrome-related antigen B antibodies
ASyS	Antisynthetase syndrome
BID	Bis in die
CK	Creatine Kinase
CT	Computed tomography
DAS28	Disease Activity Score 28
DLCO DMARDs	Diffusing capacity of the lung for carbon monoxide Disease-modifying antirheumatic drugs
DNA	Deoxyribonucleic acid
DNA-dc	Anti-double-stranded DNA antibodies
ECG	Electrocardiogram
ESR	Erythrocyte sedimentation rate
FEV1	Forced expiratory volume in 1 s
FVC	Forced vital capacity
HBsAb	Hepatitis B surface antibody
HBsAg	Hepatitis B surface antigen
HRCT	High-resolution computed tomography
IgG	Immunoglobulin G
IIM	Idiopathic inflammatory myopathy
ILD	Interstitial lung disease
LDH	Lactate dehydrogenase
MCTD	Mixed connective tissue disease
mMRC	Modified Medical Research Council (dyspnea scale)
NSIP	Nonspecific interstitial pneumonia
PAPS PCR	Pulmonary artery systolic pressure C-Reactive protein
PFT	Pulmonary Function Testing
PL-7	threonyl
PL-12	Anti-alanyl-tRNA synthetase
PM-Scl 70	Polymyositis/Scleroderma 70
RA	Rheumatoid arthritis
RF	Rheumatoid factor
RNA	Ribonucleic acid
Sm	Smith antigen (antibody)
SpO2	Peripheral oxygen saturation
SSc	Systemic sclerosis
TB	Tuberculosis
Tid	Ter in die
U1-RNP	U1 small nuclear ribonucleoprotein particle
UIP	Usual interstitial pneumonia