LabMed

Decreased Urine Specific Gravity

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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