Blood Day for Primary Care

Transcription

1 Blood Day for Primary Care How I work up undifferentiated anemia Ryan Zarychanski MD MSc FRCPC Donald Houston MD PhD FRCPC Department of Medical Oncology & Haematology, CancerCare Manitoba Dept. Internal Medicine, Section of Hematology/ Medical Oncology, University of Manitoba

2 Disclosures D O N A L D S. H O U S T O N 1. No shares 2. No grants 3. No speaking fees 4. No advisory boards 5. No dinners

3 Disclosures R Y A N Z A R Y C H A N S K I Grants/Research Support: None relevant to presenta.on Speaker bureau/honoraria amounts: None relevant to presenta.on Consul8ng fees: None relevant to presenta.on Other: None relevant to presenta.on

4 Objectives 1. Direct the investigation of anemia with reference to a practical algorithm that starts from the full set of data in the complete blood count 2. Employ appropriate additional testing including blood film, reticulocyte count, iron studies, and ancillary biochemical tests in the further characterization of anemia 3. Communicate effectively to make optimal use of the consultant hematologist

5 A case A 17 year old woman is referred for anemia (note at age 17, consult goes to adult service)

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7 A case No additional data provided with referral Looked up in e-chart blood work from 6 mo. earlier: WBC 5.6 Hb 91 MCV 66.6fL, MCHC 282g/L, MCH 18.8pg RDW 18.5% Platelets 338

8 A case What investigation is most appropriate in work-up of this patient at this time? 1. Serum iron and TIBC 2. Reticulocyte count 3. LDH, haptoglobin, direct & total bilirubin 4. Serum ferritin 5. Hemoglobin electrophoresis

9 A case Result: serum ferritin 3ug/L

10 General Points Anemia is very common Anemia is often more important as an objective indicator of illness than a problem for the patient in itself Every case of anemia warrants thought; investigation should be undertaken if the cause of anemia is not apparent Most cases can be sorted out by generalists

11 First: Four Practical Rules 1. If your laboratory doesn t automatically supply them, always order WBC and differential, red cell indices, and platelet count, when you order a hemoglobin (i.e. complete blood count, or CBC) 2. Look at prior CBC results, if available. Trends are as informative as point values 3. If the abnormality is minor / unexpected: repeat it before embarking on extensive investigation 4. In formulating an investigation plan and establishing a diagnosis, take account of everything you know about the patient

12 START Low Hb identified Step 1 WBC or Platelets also abnormal? no Step 2 MCV yes Multiple Cytopenias Blasts NRBCs Dysplasia Immature WBCs } Smear normal and other cytopenias not severe TTP, HUS infiltration, Myelodysplasia Acute Leukemia Microcytic low Iron Deficiency Ferritin normal, with signs of inflammation disease* Thalassemia Yellow area: Hematology consultation recommended Consider trial of iron therapy if needed check Hb electrophoresis high Acute blood loss or hemolysis toxins Renal failure disease Combined anemia Liver disease** Hypothyroidism, testosterone** Myeloma infiltration Stem cell defect Normocytic Step 3 Reticulocyte Count Step 3a Hypoproliferative Drug history Creatinine Ferritin, B12 Endocrine tests SPEP & FLCR N or Low High Hyperproliferative Step 3b LDH, bilirubin, haptoglobin norm abn Hemolytic Coombs test G-6-PD, PK screens Recovery from nutrient deficiency, toxic exposure, or acute blood loss Spherocytes Normal Microangiopathic Mechanical Spherocytosis Autoimmune Enzymopathy Macrocytic Serum B12 Retic. count Medication and alcohol history Key: B12 deficiency Antimetabolites, alcoholism* Potential folate deficiency Liver disease* Myelodysplasia* Tests Diagnoses Classifications *Alteration in MCV is modest, and MCV is often within normal range **Uncommon to cause more than mild anemia; test according to clinical context Donald S. Houston MD 2014

13 Notes about the Algorithm It starts with data provided for free by the automated analyzer (WBC and platelet count, and MCV) Disclaimer: No algorithm can address every possible patient; in particular it is common for patients to have more than one process contributing to their anemia Make use of all the data available to you!

14 Notes about the Algorithm Yellow area indicates when referral to Hematologist is warranted Note about blood smears: if the automated hematology analyzer ﬂags a signiﬁcant abnormality, a blood smear will likely be done even if you haven t requested it. Look for the result

15 Anemia Algorithm START Step 1 WBC or Platelets also abnormal? Low Hb identified Multiple Cytopenias yes Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } infiltration, Myelodysplasia Acute Leukemia Smear normal and other cytopenias not severe Normocytic Microcytic TTP, HUS Macrocytic Step 3 Iron Deficiency low Acute blood loss or hemolysis Ferritin normal, with signs of inflammation Consider trial of iron therapy Thalassemia if needed check Hb electrophoresis Serum B12 Step 3a N high w H ig h Lo or Hypoproliferative toxins disease* Reticulocyte Count Drug history Renal failure Creatinine disease Combined anemia Ferritin, B12 B12 deficiency Retic. count Antimetabolites, alcoholism* Hyperproliferative Step 3b Medication and alcohol history LDH, bilirubin, haptoglobin Liver disease* Myelodysplasia* norm abn Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficiency Spherocytes Yellow area: Hematology consultation recommended Liver disease** Hypothyroidism,! testosterone** Endocrine tests Myeloma SPEP & FLCR infiltration Stem cell defect Normal Microangiopathic Mechanical Tests Key: Diagnoses Classifications Spherocytosis Coombs test G-6-PD, PK screens Autoimmune Enzymopathy *Alteration in MCV is modest, and MCV is often within normal range **Uncommon to cause more than mild anemia; test according to clinical context Donald S. Houston MD 2014

16 Step 1 WBC or Platelets also abnormal? Multiple Cytopenias yes Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } infiltration, Myelodysplasia Acute Leukemia Macrocytic Refer to Dr. Moltzan s algorithm on pancytopenia Step 3 in conjunc.on with thrombocytopenia: TTP/HUS or DIC Emergent referral Reticulocyte Blasts Urgent referral Count Serum B12 B12 deficiency Immature W BCs: m ore t han 2 % p romyelocytes o r m yelocytes Step 3a Dysplasia: hlypogranular neutrophils or platelets, Pelger- Huet ow Hi N or Hypoproliferative ow toxins TTP, HUS Smear normal and other cytopenias not severe Normocytic Acute ood loss emolysis gh Retic. count Hyperproliferative Step 3b Drug history LDH, bilirubin, Medication and alcohol history Antimetabolites, alcoholism* Potential folate deficiency

18 START Step 1 WBC or Platelets also abnormal? Low Hb identified Multiple Cytopenias yes Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } infiltration, Myelodysplasia Acute Leukemia Smear normal and other cytopenias not severe Normocytic Microcytic TTP, HUS Macrocytic Step 3 Iron Deficiency low Acute blood loss or hemolysis Ferritin normal, with signs of inflammation Consider trial of iron therapy Thalassemia if needed check Hb electrophoresis Serum B12 Step 3a N high or Drug history Renal failure Creatinine disease w H i Lo Hypoproliferative toxins disease* Reticulocyte Count B12 deficiency gh Retic. count Hyperproliferative Antimetabolites, alcoholism* Step 3b Medication and alcohol history LDH, bilirubin, haptoglobin Liver disease* Myelodysplasia* norm abn Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficiency Combined anemia Ferritin, B12 Spherocytes Liver disease** Hypothyroidism,! testosterone** Endocrine tests Normal Microangiopathic Mechanical Spherocytosis Coombs test Autoimmune Tests Key: Diagnoses Classifications

20 Step 2 MCV Normocytic Microcytic Step 3 Iron Deficiency low Acute blood loss or hemolysis Ferritin normal, with signs of inflammation Consider trial of iron therapy disease* if needed check Thalassemia Hb electrophoresis Reticulocyte Count Step 3a N high ow Hig h L or Hypoproliferative If iron deﬁciency is established Drug history toxins or likely, evaluate for source of bleeding Renal Creatinine failure Refer to Iron Deﬁciency algorithm disease Hype St LDH ha ab Hem Bloo Combined anemia Ferritin, B12 Liver disease** No

22 Immature WBCs infiltration, Myelodysplasia Acute Leukemia Smear normal and other cytopenias not severe Anemia Algorithm ytic Macrocytic cyte t Serum B12 B12 deficiency gh Retic. count yperproliferative Antimetabolites, alcoholism* Step 3b Medication and alcohol history LDH, bilirubin, haptoglobin Liver disease* Myelodysplasia* abn norm Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficiency Spherocytes Tests

23 Anemia Algorithm START Step 1 WBC or Platelets also abnormal? Low Hb identified Multiple Cytopenias yes Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } infiltration, Myelodysplasia Acute Leukemia Smear normal and other cytopenias not severe Normocytic Microcytic TTP, HUS Macrocytic Step 3 Iron Deficiency low Acute blood loss or hemolysis Ferritin normal, with signs of inflammation Consider trial of iron therapy Reticulocyte Count N high Serum B12 Step 3a or w H ig h Lo Hypoproliferative Retic. count disease* Thalassemia if needed check Hb electrophoresis Drug history Renal failure Creatinine disease Combined anemia Ferritin, B12 Antimetabolites, alcoholism* Hyperproliferative Medication and alcohol history Step 3b toxins B12 deficiency LDH, bilirubin, haptoglobin norm abn Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficiency Liver disease* Myelodysplasia* Spherocytes Liver disease** Yellow area: Hematology consultation recommended Hypothyroidism,! testosterone** Endocrine tests Myeloma SPEP & FLCR infiltration Stem cell defect Normal Microangiopathic Mechanical Tests Key: Diagnoses Classifications Spherocytosis Coombs test G-6-PD, PK screens Autoimmune Enzymopathy *Alteration in MCV is modest, and MCV is often within normal range **Uncommon to cause more than mild anemia; test according to clinical context Donald S. Houston MD 2014

24 RT Step 1 WBC or Platelets also abnormal? Low Hb identified Multiple Cytopenias yes Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } Bone marr infiltration Myelodyspl Acute Leuke Smear normal and other cytopenias not severe Normocytic Microcytic TTP, HU Macrocytic Step 3 Iron ficiency low normal, with signs of inflammation hronic sease* assemia Acute blood loss or hemolysis Ferritin Consider trial of iron therapy Hb electrophoresis Serum B12 Step 3a N high Drug history Renal failure Creatinine disease B12 deficienc ow Hig h L or Hypoproliferative toxins if needed check Reticulocyte Count Retic. count Hyperproliferative Antimetabolite alcoholism* Step 3b Medication and alcohol history LDH, bilirubin, haptoglobin Liver disease Myelodysplasi norm abn Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficien Combined anemia Ferritin, B12 Spherocytes Liver disease** Normal Microangiopathic Tests Key: Diagnoses

25 Notes about the Reticulocyte Count Retics should increase physiologically in response to anemia, but to do so requires: Normal renal function (to produce erythropoietin) Time (7 10 days from drop in hemoglobin) Normal marrow function High reticulocyte can indicate Compensation for hemolysis Recovery from blood loss, nutritional anemia or marrow suppression

26 Anemia Algorithm START Step 1 WBC or Platelets also abnormal? Low Hb identified Multiple Cytopenias yes Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } infiltration, Myelodysplasia Acute Leukemia Smear normal and other cytopenias not severe Normocytic Microcytic TTP, HUS Macrocytic Step 3 Iron Deficiency low Acute blood loss or hemolysis Ferritin normal, with signs of inflammation Consider trial of iron therapy Reticulocyte Count N high Serum B12 Step 3a or w H ig h Lo Hypoproliferative Retic. count disease* Thalassemia if needed check Hb electrophoresis Drug history Renal failure Creatinine disease Combined anemia Ferritin, B12 Antimetabolites, alcoholism* Hyperproliferative Medication and alcohol history Step 3b toxins B12 deficiency LDH, bilirubin, haptoglobin norm abn Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficiency Liver disease* Myelodysplasia* Spherocytes Liver disease** Yellow area: Hematology consultation recommended Hypothyroidism,! testosterone** Endocrine tests Myeloma SPEP & FLCR infiltration Stem cell defect Normal Microangiopathic Mechanical Tests Key: Diagnoses Classifications Spherocytosis Coombs test G-6-PD, PK screens Autoimmune Enzymopathy *Alteration in MCV is modest, and MCV is often within normal range **Uncommon to cause more than mild anemia; test according to clinical context Donald S. Houston MD 2014

27 Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } infiltration, Myelodysplasia Acute Leukemia Smear normal and other cytopenias not severe Normocytic Microcytic TTP, HUS Macrocytic Step 3 Iron Deficiency low Acute blood loss or hemolysis Ferritin normal, with signs of inflammation Consider trial of iron therapy Thalassemia if needed check Hb electrophoresis Serum B12 Step 3a N high or Drug history Renal failure Creatinine disease B12 deficiency w H ig h Lo Hypoproliferative toxins disease* Reticulocyte Count Retic. count Antimetabolites, alcoholism* Hyperproliferative Step 3b Medication and alcohol history LDH, bilirubin, haptoglobin Liver disease* Myelodysplasia* norm abn Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficiency Combined anemia Ferritin, B12 Spherocytes Liver disease** Yellow area: Hematology consultation recommended Hypothyroidism,! testosterone** Endocrine tests Myeloma SPEP & FLCR infiltration Stem cell defect Normal Microangiopathic Mechanical Tests Key: Diagnoses Classifications Spherocytosis Coombs test G-6-PD, PK screens Autoimmune Enzymopathy *Alteration in MCV is modest, and MCV is often within normal range **Uncommon to cause more than mild anemia; test according to clinical context Donald S. Houston MD 2014

28 Notes about the Ancillary Tests It is expedient to order multiple investigations together at the outset of this diagnostic path: Creatinine Liver enzymes LDH Direct and total bilirubin Serum ferritin and B12 TSH

29 Blasts NRBCs Dysplasia Immature WBCs no Step 2 MCV } infiltration, Myelodysplasia Acute Leukemia Smear normal and other cytopenias not severe Normocytic Microcytic TTP, HUS Macrocytic Step 3 Iron Deficiency low Acute blood loss or hemolysis Ferritin normal, with signs of inflammation Reticulocyte Count N high or Consider trial of iron therapy disease* Thalassemia if needed check Hb electrophoresis Renal failure Creatinine disease Combined anemia Liver disease** Yellow area: Hematology consultation recommended Drug history Hypothyroidism,! testosterone** Endocrine tests Myeloma SPEP & FLCR infiltration Stem cell defect w H ig h Retic. count Antimetabolites, alcoholism* Hyperproliferative Step 3b Medication and alcohol history LDH, bilirubin, haptoglobin Liver disease* Myelodysplasia* norm abn Hemolytic Recovery from nutrient deficiency, toxic exposure, or acute blood loss Potential folate deficiency Ferritin, B12 B12 deficiency Lo To dis.nguish whether Hypoproliferative an elevated re.c count reﬂects hemolysis, or recovery from blood loss or marrow suppression, order LDH, bilirubin direct / total, and haptoglobin toxins Serum B12 Step 3a Spherocytes Normal Microangiopathic Mechanical Tests Key: Diagnoses Classifications Spherocytosis Coombs test G-6-PD, PK screens Autoimmune Enzymopathy *Alteration in MCV is modest, and MCV is often within normal range **Uncommon to cause more than mild anemia; test according to clinical context Donald S. Houston MD 2014

30 Take Home Messages H O W I W O R K U P A N E M I A Look at all the data from the CBC Most anemias also need a reticulocyte count Non-microcytic anemias need a blood smear Microcytic anemia: check ferritin first Other anemias: obtain a set of investigations including creatinine, liver enzymes, LDH, direct and total bilirubin, serum ferritin, serum B12, TSH

31 When to consider a referral to hematology H O W I W O R K U P A N E M I A Indication of bone marrow disorder Pancytopenia Blast cells on blood film NRBCs and immature white cells Indication of hemolysis Elevated retics, increased indirect bilirubin, increased LDH, decreased haptoglobin You re stumped

32 Another case G R A D U A T E L E V E L

33 Another case G R A D U A T E L E V E L Dec 3 Nov 14 Jul 18 WBC 6.4 Hb MCV platelets PMNs Lymphs Monos Eos Basos * * A year ago

34 Another case G R A D U A T E L E V E L Additional data provided: Serum B12 (N), serum ferritin (538) SPEP and UPEP (negative), total protein (60), albumin (39) TSH (N) ESR (35) AST, ALT, alk phos, GGT (N) LDH (153), total bilirubin (10.3) Creatinine (84)

35 Another case G R A D U A T E L E V E L Are there any other data you would like? What should be done next?

36 START Low Hb identified Step 1 WBC or Platelets also abnormal? no Step 2 MCV yes Multiple Cytopenias Blasts NRBCs Dysplasia Immature WBCs } Smear normal and other cytopenias not severe TTP, HUS infiltration, Myelodysplasia Acute Leukemia Microcytic low Iron Deficiency Ferritin normal, with signs of inflammation disease* Thalassemia Yellow area: Hematology consultation recommended Consider trial of iron therapy if needed check Hb electrophoresis high Acute blood loss or hemolysis toxins Renal failure disease Combined anemia Liver disease** Hypothyroidism, testosterone** Myeloma infiltration Stem cell defect Normocytic Step 3 Reticulocyte Count Step 3a Hypoproliferative Drug history Creatinine Ferritin, B12 Endocrine tests SPEP & FLCR N or Low High Hyperproliferative Step 3b LDH, bilirubin, haptoglobin norm abn Hemolytic Coombs test G-6-PD, PK screens Recovery from nutrient deficiency, toxic exposure, or acute blood loss Spherocytes Normal Microangiopathic Mechanical Spherocytosis Autoimmune Enzymopathy Macrocytic Serum B12 Retic. count Medication and alcohol history Key: B12 deficiency Antimetabolites, alcoholism* Potential folate deficiency Liver disease* Myelodysplasia* Tests Diagnoses Classifications *Alteration in MCV is modest, and MCV is often within normal range **Uncommon to cause more than mild anemia; test according to clinical context Donald S. Houston MD 2014

37 Questions? Ryan Zarychanski Donald Houston