Differential Diagnosis
Loss of renal tubular concentrating ability
Overhydration
Diabetes insipidus
Unsatisfactory collection of specimen producing low specific gravity
Suggested Additional Lab Testing
Serum or plasma BUN and/or creatinine as initial assessment for renal disease
Repeat urinalysis to assess whether unsatisfactory collection (most likely dilution with water) produced the low specific gravity
Tests to evaluate the possibility of diabetes insipidus
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