The aim of the present investigation was to assess and compare health
status instruments in SLE. One hundred and twenty-five patients comple
ted five health status instruments: the Health Assessment Questionnair
e (HAQ), Functional Ability Index, the Fatigue Severity Scale (FSS), t
he Disability Days Measure (DDM), the Centre for Epidemiological Studi
es Depression Scale (CES-D), and the Medical Outcomes Study (MOS) Shor
t Form Health Survey during their Clinic visit. Disease activity was m
easured using the SLE Disease Activity Index (SLEDAI). All instruments
described a spectrum of quality of life outcomes in these patients. A
n inter-instrument correlation analysis revealed that components of th
e MOS correlated significantly with each of the other instruments used
. There was no correlation between any of the instruments used and the
SLEDAI. We conclude that health status assessment as measured by the
MOS short form is a valid independent outcome measure in patients with
SLE.