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Approach to Thrombotic Microangiopathy (TMA) - Differential Diagnosis and Management Algorithm

Suspected TMA: Unexplained thrombocytopenia + MAHA
Microangiopathy (TMA) - Differential ... , Urine hemoglobin ... Haptoglobin • ↑ Urine ... Microangiopathy #TMA #Differential ... Management #Algorithm #hematology
Laboratory Testing in Hemolytic Anemia

Intravascular vs Extravascular Hemolysis
Reticulocytes
Unconjugated bilirubin
LDH
Peripheral smear
Haptoglobin
Urine hemosiderin
Urine hemoglobin
Carboxyhemoglobin

#Hemolytic #Anemia #Laboratory #Testing #workup
Unconjugated bilirubin LDH ... Haptoglobin Urine ... hemosiderin Urine ... workup #diagnosis #hematology
Urine Specific Gravity - Interpretation
Specific Gravity = Density of urine / Density of water
SG close to
Urine Specific Gravity ... Gravity = Density of urine ... resistance to ADH ... inappropriate ADH ... Interpretation #diagnosis #differential
Causes of Hyponatremia - Differential Diagnosis Algorithm
Syndrome of Inappropriate ADH - Euvolemic; no physiologic stimulus to
Hyponatremia - Differential ... Inappropriate ADH ... Hypo-osmolar urine ... 100 mmol/kg - ADH ... Hyponatremia #Nephrology #Differential
Causes of Hyponatremia - Differential Diagnosis Algorithm
Syndrome of Inappropriate ADH - Euvolemic; no physiologic stimulus to
Hyponatremia - Differential ... Inappropriate ADH ... Hypo-osmolar urine ... 100 mmol/kg - ADH ... Hyponatremia #Nephrology #Differential
Hyponatremia Differential Diagnosis Algorithm - Utilizing Uric Acid 
ADH promotes Urea/uric acid excretion along with water
Hyponatremia Differential ... Utilizing Uric Acid ADH ... Osmolarity 2) Urine ... Osmolarity 3) Urine ... #Hyponatremia #Differential
Cerebral Salt Wasting vs SIADH - Pathophysiology 
1) Neurological event
2) Sodium loss from tubules
3) Naturiesis →
Hypovolaemia → ADH ... → Increased urine ... #hyponatremia #comparison
Causes of Polyuria - Differential Diagnosis
Excess Intake of Water:
 • Primary polydipsia (a.k.a. "psychogenic polydipsia")
 •
of Polyuria - Differential ... production Of ADH ... resistance to ADH ... Polyuria Mimics (↑ urine ... frequency without ↑ urine
Hyponatremia (<135 mEq/L) is a common electrolyte abnormality caused by an excess of total body water
body water in comparison ... serum osmolality, urine ... concentration and urine ... osmolality helps to differentiate ... increase in the urine
Isolated Hyperbilirubinemia - Differential Diagnosis Algorithm
Direct Hyperbilirubinemia: Dubin-Johnson Syndrome, Rotor Syndrome
Indirect Hyperbilirubinemia: 
 - Trauma, Hematoma,
Hyperbilirubinemia - Differential ... Transfusion - LDH ... Type I or II - LDH ... Hyperbilirubinemia #Isolated #Differential ... Diagnosis #Algorithm #hepatology