Dr. Gerald Diaz @GeraldMD
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Board Certified Internal Medicine Hospitalist, GrepMed Editor in Chief πŸ‡΅πŸ‡­ πŸ‡ΊπŸ‡Έ - Sign up for an account to like, bookmark and upload images to contribute to our community platform. Follow us on IG: https://www.instagram.com/grepmed/ | Twitter: https://twitter.com/grepmeded/
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Hypernatremia Differential Diagnosis Algorithm - Diabetes Insipidus Workup

Step #1 - Consider the history
Step #2 - Assess
Hypernatremia Differential ... Diagnosis Algorithm ... - Diabetes Insipidus ... #Sodium #nephrology ... #insipidus #DI
Causes of Hypernatremia - Differential Diagnosis
Inadequate water intake:
 β€’ Lack of access to water
Extrarenal hypotonic fluid
Hypernatremia - Differential ... Diagnosis Inadequate ... diabetes insipidus ... #Diagnosis #Causes ... #nephrology #sodium
Polyuria - Differential Diagnosis Algorithm
Urine Output > 3L /day
Water Diuresis (Urine Osm <100 mOsm/kg)
 β€’ Primary
Polyuria - Differential ... Diagnosis Algorithm ... Diabetes Insipidus ... #Diagnosis #Algorithm ... #causes #nephrology
True Hyponatremia Differential Algorithm

Instead (or in addition) of volume status examination, check urine sodium and serum
Algorithm Instead ... low, uric acid ... and uric acid low ... #Algorithm #Diagnosis ... #Nephrology
Hyponatremia Differential Diagnosis Algorithm - Utilizing Uric Acid 
ADH promotes Urea/uric acid excretion along with water
Hyponatremia Differential ... Diagnosis Algorithm ... #Diagnosis #Algorithm ... #nephrology #sodium ... #low #uricacid
Diabetes Insipidus - Diagnosis Algorithm
Tests:
 β€’ Osmolality, Urine AND/OR
 β€’ Osmolality, Serum or Plasma AND
 β€’
Diabetes Insipidus ... - Diagnosis Algorithm ... #Insipidus #Diagnosis ... #Algorithm #nephrology ... #differential
Causes of Polyuria - Differential Diagnosis
Excess Intake of Water:
 β€’ Primary polydipsia (a.k.a. "psychogenic polydipsia")
 β€’
of Polyuria - Differential ... Diagnosis Excess ... Diabetes Insipidus ... β€’ Central Dl (Low ... #nephrology
Two-step Copeptin algorithm for differential diagnosis of Diabetes Insipidus (DI)

Baseline Copeptin < 21.4 pmol/L:
 β€’ Arginine-stimulated
for differential ... diagnosis of Diabetes ... Insipidus (DI) ... #nephrology #differential ... #diagnosis
Physiologic Approach to Hypotonic Hyponatremia
The next time you have a case of hypotonic hyponatremia, give the
normal volume-based algorithm ... can be high or low ... #Hyponatremia #differential ... #diagnosis #table ... #sodium #nephrology
Primary Polydipsia
Definition: Excessive volitional water intake
Epidemiology:
 β€’ 6-20% of patients with psychiatric disorders - Most commonly
insipidus Differential ... Diagnosis: Diabetes ... Insipidus, Impaired ... , Urine Sodium ... #management #nephrology