Table 1

 BILAG renal score

BILAG, British Isles Lupus Assessment Group; HPF, high power field; rbc, red blood cell; wc, white cell.
CATEGORY A
Disease thought to be sufficiently active to require disease modifying treatment, prednisolone >20 mg/dl or immunosuppressant.
Two or more of the following present, providing (1), (4), or (5) is included:
(1) Proteinuria, defined as
    Urinary dipstick increased by two or more levels; or
    24 hour urinary protein rising from <0.20 g to >1 g; or
    24 hour urinary protein rising from >1 g by 100%; or
    Newly documented proteinuria of >1 g
(2) Accelerated hypertension
(3) Deteriorating renal function, defined as
    Plasma creatinine >130 μm/l and having risen to >130% of previous value; or
    Creatinine clearance having fallen to <67% of previous value; or
    Creatinine clearance <50 ml/min and previously >50 ml/min or not measured.
(4) Active urinary sediment (on uncentrifuged specimen): pyuria (>5 wc/hpf), haematuria (>5 rbc/hpf), or red cell casts in the absence of infection or other cause
(5) Histological evidence of active nephritis by WHO criteria within last 3 months (or since previous assessment if seen less than 3 months ago; sclerosis without inflammation not counted)
CATEGORY B
Disease requiring only symptomatic treatment.
One of the following present:
(1) One of the category A criteria
(2) Proteinuria
    Urinary dipstick which has risen by 1+or more to at least 2+; or
    24 hour urinary protein rising from >1 g by >50% but <100%
(3) Raised plasma creatinine: Plasma creatinine >130 μm/l and having risen to 115% of previous value
CATEGORY C
Stable, mild disease
One of the following present:
(1) 24 hour urinary protein >0.25 g
(2) Urinary dipstick 1+ or more
(3) Rising blood pressure, defined as systolic rise of ⩾30 mm Hg and diastolic rise of ⩾15 mm Hg (provided the recorded values are >140/90 mm Hg)
CATEGORY D
Previous renal disease
CATEGORY E
No previous renal disease