Thrombocytopenia differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Farbod Zahedi Tajrishi, M.D.

Overview

Thrombocytopenia has a broad range of potential causes. While a good history and physical examination can be helpful to diagnose some of these causes such as drug-induced thrombocytopenia, they usually don't suffice and further evaluation is often needed. There are also some useful points that may guide the physician to an appropriate diagnosis. For example, asymptomatic, isolated thrombocytopenia most probably suggests ITP, while thrombocytopenia in critically ill, hospitalized patients is usually suggestive of iatrogenic causes (eg. dilution), platelet consumption, bone marrow suppression from infection/sepsis, or even drug-induced thrombocytopenia. One should consider however, that a wide variety of other conditions such as autoimmune disorders, nutrient deficiencies, thrombotic microangiopathies could all as well cause thrombocytopenia.

Thrombocytopenia Differential Diagnosis

Differentiating the diseases that can cause thrombocytopenia:

Category	Condition		Etiology	Mechanism			Inherited	Acquried	Clinical manifestations									Para−clinical findings								Gold standard	Associated findings
									Demography	History	Symptoms			Signs
																		Lab Findings
											Fever	Rash	Bleeding	BP	Splenomegaly	Jaundice	Other	CBC			PBS	Bone marrow exam	PT	PTT	UA
				Decreased platelet production	Platelet destruction in blood	Platelet destruction in spleen												Plt	HB	WBC
Hematology	Bone marrow disorders	Myelodysplastic syndromes	Unknown Mutation	+	−	−	-/+	+	Elderly	Exposure to Chemotherapy Radiation therapy Tobacco smoke	+	Petechiae, purpura, diffuse erythematous rash	+	Nl	+	+	Shortness of breath, fatigue	↓	↓	↓	Ovalomacrocytosis Basophilic stippling Howell-Jolly body Dysplastic neutrophils	Impaired myeloid maturation Dyserythropoiesis Dysgranulopoiesis Dysmegakaryocytopoiesis Hypercellular bone marrow Fibrosis	Nl	Nl	Nl	Bone marrow examination + clinical manifestation	Might transformed to acute leukemia
		Aplastic anemia	Unknown secondary to radiation, drugs and chemicals, pregnancy, PNH and viral or autoimmune causes	+	−	−	-/+	-/+	Biphasic (the young and the elderly)	Exposure to Chemicals Radiation History of Prior drug use Viral infection	−	−	+	Nl	−	−	Shortness of breath, fatigue, pallor	↓	↓	↓	large RBCs low platelets and granulocytes	Hypocellular bone marrow replacement of bone marrow by fat				Bone marrow examination + laboratory findings	Fanconi Anemia Dyskeratosis congenita Schwachman-Diamond syndrome Reticular dysgenesis Familial aplastic anemia Preleukemia Nonhematologic syndrome
		Acute leukemia		+
		Paroxysmal nocturnal hemoglobinuria (PNH)	Deficiency of complement regulatory proteins Mutations	+			−	+	Any age (usually younger adults)								thrombosis smooth muscle dystonia	↓/Nl	↓	↓/Nl		Usually cellular marrow Erythroid hyperplasia dyserythropoiesis The marrow may also become hypocellular or even aplastic in certain stages of the disease	Nl	Nl	hemoglobinuria	Flow cytometry	Chronic renal failure Pulmonary hypertension Aplastic anemia
	Condition		Etiology	Decreased platelet production	Platelet destruction in blood	Platelet destruction in spleen	Inherited	Acquried	Demography	History	Fever	Rash	Bleeding	BP	Splenomegaly	Jaundice	Other signs	Plt	HB	WBC	PBS	Bone marrow exam	PT	PTT	UA	Gold standard	Associated findings
	Thrombotic microangiopathy (TMA)	Thrombotic thrombocytopenic purpura (TTP)	Deficiency of, or antibodies to, the metalloprotease ADAMTS13		+		-/+	+	Any age		+								↓		Fragmented RBCs		Nl	Nl			Hemolysis Microvascular thrombosis
		Hemolytic uremic syndrome (HUS)	Escherichia coli O157:H7 Genetic defects		+		-/+	+	Children														Nl	Nl			Acute renal failure Hemolysis Microvascular thrombosis
		DIC		+	+		−	+	Any age	History of trauma, sepsis, malignancy, vasculitis or exogenous toxins		+	+					↓			Schistocytes		↑↑	↑		Laboratory studies including CBC, PT, PTT, FDP and d-dimer	Hemolysis Microangiopathy
	Congenital platelet disorders	MYH-9 related disorders	Cytoskeletal defects in megakaryocytes				+	−									Hearing loss Renal impairment Cataract	↓			Large platelets Leukocyte inclusions
		Bernard-Soulier syndrome	Absence of Gp Ib-IX-V	+	−	−	+	−	Children	History of easy bruising and bleeding symptoms	−	−	+	Nl	−	−	−	↓	Nl	Nl	Large platelets	NA	Nl	Nl	Nl	Flow cytometry	Increased bleeding time
		Gray platelet syndrome					+	−
		Wiskott-Aldrich syndrome	Mutation in GATA-1				+	−													Small platelets						eczema recurrent infections autoimmune disorders malignancy
		Thrombocytopenia with absent radius (TAR) syndrome	1q21.1 deletion and bone marrow failure				+	−													Normal size platelets
		Alport syndrome					+	−
		Von Willebrand disease	VWF deficiency/dysfunction		−	−	+	Rarely	More common with O blood type	Bleeding symptoms	−	−	+	−	−	−	−	Nl/ ↓	Nl/↓	Nl	Large platelets		Nl	Nl or ↑		Laboratory findings
	Nutrient deficiencies	Folate, vitamin B12, copper		+
Category	Condition		Etiology	Decreased platelet production	Platelet destruction in blood	Platelet destruction in spleen	Inherited	Acquried	Demography	History	Fever	Rash	Bleeding	BP	Splenomegaly	Jaundice	Other signs	Plt	HB	WBC	PBS	Bone marrow exam	PT	PTT	UA	Gold standard	Associated findings
Rheumatologic/autoimmune disorders	ITP		Immune-mediated platelet destruction Inhibition of platelet release from the megakaryocyte	+	+	−	−	+	Any age	−	−	Ecchymoses and petechia	+ Mucocutaneous	Nl	−	−	−	↓↓↓	Nl	Nl	Nl	Large platelets, otherwise normal	Nl	Nl	Nl	Diagnosis of exclusion	Spontaneous remission
	Systemic lupus erythematosus		Immune-mediated platelet destruction		+
	Antiphospholipid syndrome		Autoantibody-mediated syndrome		+
	Felty's syndrome		Splenomegaly			+
Infection-induced	Bacterial infections	Sepsis	Direct bone marrow suppression	+	+																		↑	↑
		Helicobacter pylori	Immune thrombocytopenia		+
		Tick-borne infection			+
	Viral infections	HIV	An ITP-like condition called primary HIV-associated thrombocytopenia	+	+	+
		Other viruses such as rubella, mumps, varicella, parvovirus, hepatitis C, & Epstein-Barr virus		+
	Parasitic infections	Malaria
		Babesiosis
Category	Condition		Etiology	Decreased platelet production	Platelet destruction in blood	Platelet destruction in spleen	Inherited	Acquried	Demography	History	Fever	Rash	Bleeding	BP	Splenomegaly	Jaundice	Other signs	Plt	HB	WBC	PBS	Bone marrow exam	PT	PTT	UA	Gold standard	Associated findings
Medication/toxicity	Antibiotics/ Antiepileptic	Quinine Sulfonamides Carbamazepine Phenytoin	Occurrence of drug-dependent, platelet-reactive antibodies	+	+	-	-	+	Any	Drug ingestion or injection	-	Ecchymoses and petechia	-	Nl	-	-	-	↓↓	↓	Nl	Reduced platelets	NA	Nl	Nl	Nl	Clinical manifestation + exclusion of the other causes	NA
	Heparin-induced thrombocytopenia		Anti-heparin/PF4 antibody	-	+	-	-	+	Any	Heparin injection	-	Necrotic skin lesions	-	Nl	-	-	-	↓	Nl	Nl	Reduced platelets	NA	Nl	Nl	Nl	ELISA	Early or delayed-onset Thrombosis
	Cytotoxic chemotherapy		Bone marrow suppression	+	-	-	-	+	Patients with malignancy	Drug ingestion or injection Cancer	-	Ecchymoses and petechia	-	Nl	-	-	-	↓	↓	↓	Reduced platelets	Megakaryocytic hypoplasia or aplasia	↑	↑	Hematuria	Clinical manifestation + exclusion of the other causes	Thrombosis
	Radiation therapy		Predictable, dose-dependent myelosuppression	+	-	-	-	+	Patients with malignancy	Radiation Cancer	-	Purpura, petechiae	+	Nl	-	-	-	↓	↓	↓	Reduced platelets	Megakaryocytic hypoplasia or aplasia	↑	↑	Hematuria	Clinical manifestation + exclusion of the other causes	Thrombosis
GI	Chronic liver disease		Bone marrow suppression	+	-	-	-	+	Any	Cirrhosis Alcohol use	-	Purpura, petechiae	+	↓	+	+	-	↓	↓	Nl	Reduced platelets	NA	↑	↑	Nl	Biopsy	Portal vein thrombosis Hepatorenal syndrome Variceal hemorrhage Hepatic hydrothorax Spontaneous bacterial peritonitis
	Portal hypertension		Bone marrow suppression	+	-	-	-	+	Any	Cirrhosis Alcohol use	-	Purpura, petechiae	+	↓	+	+	-	↓	↓	Nl	Reduced platelets	NA	↑	↑	Nl	Clinical manifestation	Portal vein thrombosis Ascites
Category	Condition		Etiology	Decreased platelet production	Platelet destruction in blood	Platelet destruction in spleen	Inherited	Acquried	Demography	History	Fever	Rash	Bleeding	BP	Splenomegaly	Jaundice	Other signs	Plt	HB	WBC	PBS	Bone marrow exam	PT	PTT	UA	Gold standard	Associated findings
Vascular	Giant capillary hemangioma (Kasabach-Merritt syndrome)		Platelet destruction	−	+	−	+	−	Infants	Rare but serious infantile coagulopathy	−	Multiple purple hemangioma	Intralesional bleeding	Nl	−	−	Visceral hemangiomas	↓↓	↓↓	Nl	Normocytic normochromic erythrocytes and markedly reduced platelets	Normal erythropoiesis, myelopoiesis, and megakaryocytic hyperplasia	↑	↑	Hematuria	Biopsy	Kaposiform hemangioendothelioma Tufted angioma
	Cardiopulmonary bypass		Platelet destruction	−	+	−	−	+	Elderly	Coronary artery disease	−	Purpura, petechiae	+	Nl or ↑	-	-	-	↓	↓	Nl	Normocytic normochromic erythrocytes and markedly reduced platelets	NA	↑	↑	Hematuria	Clinical manifestation	Coagulopathy Hypofibrinogenemia
Other	Alcohol		Platelet production suppression	+	−	+	−	+	Any	History of alcohol use	−	−	-	Nl	+	+	Hepatomegaly	↓	↓	↓	Cytopenia, macrocytosis	Cytopenia, macrocytosis	↑	↑	Nl	Clinical manifestation	Chronic liver disease
	Post-transfusion purpura		Platelet destruction by anti-platelet antibodies	−	+	−	−	+	Women	History of blood transfusion or pregnancy	−	Purpura, petechiae	+	↓	−	−	−	↓↓↓	↓	Nl	Nl	NA	Nl	Nl	Nl	Positive circulating alloantibody to a common platelet antigen	Severe but rare reaction
	Gestational thrombocytopenia		Might be physiologic adaptation of pregnancy	−	−	−	−	+	Pregnant women	Positive history of mild thrombocytopenia	−	−	−	Nl	−	−	−	↓	Nl	Nl	Nl	NA	Nl	Nl	Nl	Diagnosis of exclusion	Self-limited condition
	HELLP syndrome		Unknown	−	+	−	−	+	Pregnant > 25 years	History of preeclampsia	−	−	+	↑	−	+	Abdominal tenderness Ascites	↓	↓	Nl	Schistocytes	NA	Nl	Nl	Proteinuria	Lab abnormalities	Elevated liver enzymes and bilirubin Multiorgan dysfunction
	Idiopathic cyclic thrombocytopenia		Unknown Might be autoimmune platelet destruction	+	+	-	-	+	Females with the median age of onset 35 years	Misdiagnosed as ITP with uniformly poor responses	-	Purpura, petechiae	Minor mucocutaneous bleeding	Nl	-	-	-	↓	Nl	Nl	Reduced platelets and megakaryocytes	Megakaryocytic hypoplasia or aplasia	Nl	Nl	Nl	Diagnosis of exclusion	Rebound thrombocytosis Myeloproliferative diseases Myelodysplastic syndrome
	Pseudothrombocytopenia		Platelet clumping due to EDTA	-	-	-	-	+	Rare	Collected sample in EDTA anticoagulant	-	-	-	Nl	-	-	-	↓	Nl	Nl	Low platelet count and platelet clumps	Low platelet count and platelet clumps	Nl	Nl	Nl	Repeat collecting sample in a heparin tube	Nl
Category	Condition		Etiology	Decreased platelet production	Platelet destruction in blood	Platelet destruction in spleen	Inherited	Acquried	Demography	History	Fever	Rash	Bleeding	BP	Splenomegaly	Jaundice	Other signs	Plt	HB	WBC	PBS	Bone marrow exam	PT	PTT	UA	Gold standard	Associated findings