Read the finding
Endocrine · Pattern recognition
Hyponatraemia by volume
4 findings. Cover the answers and work down the list — then flip it and predict the finding from the diagnosis.
Euvolaemic, concentrated urine (Na >20), normal thyroid/adrenalSIADH
Hypovolaemic, dry, urine Na <20GI losses or diuretics
Hypervolaemic and oedematousHeart failure / cirrhosis / nephrotic syndrome
Dilute polyuria with a HIGH sodiumDiabetes insipidus