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Anaemia that isn’t due to iron deficiency

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Presentation on theme: "Anaemia that isn’t due to iron deficiency"— Presentation transcript:

1 Anaemia that isn’t due to iron deficiency
Dr Annette Nicolle Consultant Haematologist Queen Elizabeth Hospital/ Sunderland Royal Hospital

2 Objectives Look at the wide differential diagnosis of anaemia
Discuss some clinical cases Look at laboratory pitfalls, and questions commonly asked

3 Thought for the day “Many of us talk in our sleep. The distinctive achievement of lecturers is to talk in other people’s sleep” Raymond Tallis American Author

4 Laboratory results suggestive of anaemia
Hb<11.5 g/dl for females Hb<13.0 g/dl for males Hb<11.0 g/dl for F with rheumatoid arthritis Hb<11.0 g/dl for M with rheumatoid arthritis NB – take into account previous Hb level

5 Taught at med school – not terribly helpful in cases that aren’t straightforward
The Med School Version

6 How many causes of anaemia can you come up with?
Iron deficiency EXERCISE How many causes of anaemia can you come up with? I’ve started you off Bone Marrow Blood vessels Intravascular Haemolysis Antibodies I give this one to the SpRs I teach – you can probably do better Liver and spleen Causes of Anaemia “Pooling”

7 Anaemia of chronic disease
Shortage of raw materials External insults Renal system Reduced Erythropoeitin Bone Marrow “Abnormal Genes” Blood Loss Intrinsic Marrow Problems Blood vessels Rapid turnover Intravascular Haemolysis Antibodies I use this to try to encourage the junior docs to think laterally…. Mechanical damage Liver and spleen Causes of Anaemia Extravascular Haemolysis “Pooling”

8 Case 1 See envelope set 1 Personnel:
Patient: Mike Tucker – 56 years old GP: BMS in the lab (Multitalented) “Greek Chorus” – everybody else

9 The rules The consultation exercise is run by the GP and patient
The BMS in the lab can only answer questions – he/she cannot volunteer information The GP can refer to the Greek chorus to seek opinions at any stage by calling a time-out

10 Case 1 Summary Polymyalgia Rheumatica Key features
History – limb girdle stiffness, extreme tiredness Microcytic anaemia High ESR Inflammatory features – high platelets, raised immunoglobulins Retics low – indicate reduced marrow output Anaemia of Chronic disease

11 Microcytic anaemia MCV<80 Iron deficiency Reduced Iron availability
Anaemia of chronic disease Small print: Reduced Haem synthesis Lead poisoning Reduced globin production Thalassaemia Other haemoglobinopathies

12 Case 2 Helen Archer - first pregnancy antenatal screening bloods: WBC 7.2 Hb 12.9 MCV (80-102) MCH 19.2 (27-32) Plt 251 Any thoughts?

13 Case 2 Ferritin 73 Next step? Haemoglobinopathy screen Significance?
HbA/A HbA2 4.0% Consistent with Beta thal trait Significance?

14 Case 3 Envelope set 2 Personnel: Patient: Linda Snell 63 years old GP:
BMS in the lab (Multitalented) “Greek Chorus” – everybody else Same rules apply

15 Case 3 discussion Macrocytic anaemia which had a wide differential diagnosis from history Insidious onset Family history Pancytopenia Note other clinical features of pernicious anaemia– not often present, but very useful when they are However – need sense of perspective when investigating macrocytic anaemia

16 Macrocytic Anaemia Abnormal RBC maturation Abnormal DNA Synthesis
MCV>100 Abnormal RBC maturation DRUGS Alcohol abuse Liver disease MDS, Leukaemia Hypothyroidism Abnormal DNA Synthesis B12 and Folate deficiency Mild macrocytosis: Reticulocytosis

17 Aetiology of macrocytosis in 300 patients with an MCV >99fl
Prevalence (%) Drugs (cytotoxics, anticonvulsants, anti-retrovirals ) 37 Alcohol (+/- liver disease) 26 Reticulocytosis (haemolysis or bleeding) 8 Vit B12 or folate deficiency 6 Non-alcoholic liver disease Primary bone marrow disorders (eg MDS, AML) Hypothyroidism 0.6 BMJ 2009;338:1644

18 Normocytic Anaemia Early iron deficiency Acute blood loss
Anaemia of chronic disease (may be microcytic) Renal Failure Cancer Haemolysis (or may be macrocytic) Bone marrow suppression/ disorders Combined haematinic deficiencies

19 Renal Anaemia GFR <60 = CKD possible cause of anaemia
GFR <30 (<45 in diabetics) = CKD is likely to be the cause Should not be assessed until iron deficiency corrected Can measure serum erythropoietin in clinic

20 Anaemia of Chronic Disease
Protective mechanism to reduce availability of iron where it may have a detrimental effect Reduced availability of essential nutrient for bacteria and tumour cells Anaemia limits oxygen transport which affects rapidly proliferating tissues/ organisms Reduced serum iron also increases immune response

21 Anaemia of Chronic Disease
Reduced erythropoietin responsiveness and production Reduced transferrin synthesis Reduced Fe mobilisation from macrophages Low serum iron despite adequate tissue stores Reduced iron re-utilization in erythropoiesis Raised serum ferritin Reticulocytopenia

22 Lab pitfalls

23 Ferritin SERUM FERRITIN is now a standard diagnostic test for Iron deficiency anaemia only iron deficiency will give a low result. A value <15 μg/L is diagnostic of IDA.

24 Ferritin Iron deficiency anaemia can occur with a normal or high ferritin: Liver dysfunction: ferritin is released when hepatocytes are damaged Increased haem turnover: haemolysis and trauma (including surgery) Inflammatory lesions: malignancy, infection and inflammation

In iron deficiency the serum iron is low (<10 μmol/L) and the TIBC is usually raised (>70 μmol/L). Erythropoiesis is iron-deficient when the transferrin saturation (SI  TIBC x 100%) falls below 15%. TIBC can be affected by nutritional status

26 Soluble transferrin receptor ratio
Available in some hospitals in the region Serum transferrin receptor-ferritin ratio better for distinguishing between iron deficiency and anaemia of chronic disease Ratio <1 suggests Anaemia of chronic disease and >2 iron deficiency STR derived from bone marrow cells, inversely increased in iron deficiency 26

27 Type of anaemia Blood film Ferritin Iron TIBC sTfR –ferritin ratio Anaemia of chronic disease Normocytic, normochromic Normal or raised Low <1 Early Iron Deficiency Hypochromic, mild anisocytosis Normal or Low Raised >2


29 Problems with B12 levels Serum B12 is not a good indicator of total body stores Low serum levels without a true deficiency OCP, pregnancy, iron deficiency, atrophic gastritis False normal B12 levels Myeloproliferative disease, hepatoma, acute liver disease, high titre IF Abs Have to use the result in clinical context Manufacturers warning that results should be interpreted in clinical context High titre intrinsic factor abs can give false normal B12 levels

30 Problems setting the B12 range…
B12 assay curve Setting lower end of range is difficult Normal distribution curve -applies to most lab tests

B12 > 197 pg/ml. No need for comment pg/ml. Borderline low B12 - probably not clinically significant pg/ml - Low B12. Not macrocytic: Check IFA: if positive, treat as PA If negative, consider oral Rx (unless gastric or ileal resection) and check response

pg/ml - Low B12. If macrocytic: Advise trial of IM B12. If response, continue as for PA < 100pg/ml - Low B12. Advise IM B12 therapy, check response. Diagnosis: ? PA (check IFA), ? Crohn’s, ? gastric or ileal resection

33 Problems with folate levels
(Labs do either serum or red cell folate) False normal serum folate -folate deficient patient who has had a few folic acid tablets False low serum folate – recent alcohol False normal red cell folate – recent transfusion False low red cell folate – primary B12 deficiency

Folate > 4.0ng/ml - no need for comment ng/ml - no need for treatment unless macrocytic and B12 normal, in which case advise trial of treatment and check response < 2.2ng/ml – trial of treatment ? dietary deficiency. Consider coeliac or other small bowel disorder or resection, anti-folate medication

35 Reticulocytes The reticulocyte count (retics) reflects the bone marrow's response to anaemia. A low retic count indicates bone marrow hypoplasia. Reticulocytosis (high retic count) indicates the marrow is still responding


37 Case 4 – Kate Aldridge 1 week history of flu-like illness
Fainted a couple of times Now dizzy every time she stands up WBC 7.6 Hb 4.1 Plt 282 Further investigations?

38 Further investigations
MCV 80 Iron 9.0 Bilirubin 10 Retics 10 LDH 200 Normal renal function Now what do you do?

39 Blood film Normal film Patient’s film

40 More results Spherocytes on film
No evidence of malignancy/ marrow infiltration How does that fit with your differential diagnoses? Other tests?

41 Other tests Parvovirus serology Confirm Hereditary spherocytosis
Family history?

42 “Aplastic” crisis Parvovirus B19 IgM positive Treatment 24/12/08
transfused as very symptomatic Folic acid, iron (tests showed iron 9.0) 24/12/08 25/12/08 26/12/08 29/12/08 Hb 4.1 8.3 7.8 10.1 Retics 10.3 27.2 106 425


44 Lab evidence of haemolysis
Increased reticulocyte count Increased bilirubin DAT (Direct Antibody test) – Coombs test low serum haptoglobin Increased LDH Film appearances Haemoglobinemia/ Haemoglobinuria Haemosiderinuria NB – Red cell autoantibodies are common 3% over 70s have a positive DAT – it does not necessarily cause haemolysis Fancy tests requested by haematology – osmotic fragility etc

45 Marrow Problems Anaemia may be secondary to Marrow infiltration
Cancer, Leukaemia, Lymphoma, inflammatory conditions, infections, fibrosis, Ineffective/ reduced production MDS, Aplastic anaemia, Inflammatory conditions, infections, DRUGS, anorexia Call your friendly local Haematologist…….

46 Case 5: Adam Macy Blood film – What is causing his anaemia

47 Summary Useful points Remember anaemia of chronic disease – infection/ inflammation Renal Impairment Reticulocyte count – tells you marrow function Combined haematinic deficiencies - can mask each other Historical results are useful, and rate of change Lab tests are not infallible

48 Any Questions? Thankyou

49 Causes of Anaemia Bone Marrow Blood vessels Liver and spleen
Iron deficiency Bone Marrow Blood vessels Intravascular Haemolysis Antibodies Slide for “brainstorm” Liver and spleen Causes of Anaemia “Pooling”

50 Other abnormal Haematology results
When to refer and when to relax…

51 Haematology laboratory results
Haemoglobin (erythrocytosis) Hb > 18.5, Hct >0.55 (M), Hb > 16.5, Hct > 0.50 (F) If only Hb raised, consider hypoxia, smoking, alcohol, dehydration and correct if possible If erythrocytosis persists, consider referral If accompanied by raised neutrophils and/or platelets, check if itching, sweating, splenic discomfort, gout, etc. Refer to haematology if PRV/MPD seems likely (JAK2, etc)

52 Haematology laboratory results
White cells Neutrophils < 1.5 Consider whether secondary to medication, auto-immune disorder, hypersplenism, race or viral infection If remains unexplained, refer to haematology (possible need for bone marrow biopsy) Low lymphocyte or monocyte count - no specific referral criteria, but consider HIV if lymphocytes reduced, with appropriate clinical history

53 Haematology laboratory results
White cells Neutrophils > 10.0, persisting for at least one month Exclude latent infection or inflammation, medication (esp. steroids) If accompanied by raised eosinophils and/or basophils, consider referral (? CML) If accompanied by monocytosis, consider referral (? CMMoL) If isolated neutrophilia but unexplained upward trend, consider referral

54 Haematology laboratory results
White cells Lymphocytes > 10.0, persistent for at least one month Consider infection, esp. IM or pertussis Laboratory will arrange cell markers when appropriate, and may then advise referral Monocytes >2.0, persistent for at least one month Consider chronic infection, e.g. TB If accompanied by anaemia and/or neutropenia, neutrophilia or thromoboctyopenia, refer to haematology

55 Haematology laboratory results
Platelets Platelets >600, persistent for at least one month Exclude blood loss, chronic infection or inflammation, prescribe low dose aspirin if no contra-indication If no obvious cause, refer to haematology Platelets do not refer, monitor to detect trend Platelets consider medication, auto-immune disorder, hypersplenism. Do not refer to haematology unless symptomatic Platelets <50 - consider referral to haematology unless cause is clear and/or more relevant to another speciality

56 Haematology laboratory results
Coagulation tests Consider referral to haematology if patient symptomatic (bruising or bleeding) and abnormalities not secondary to anticoagulation, dietary deficiency or known liver disease: PT > 18 secs APTT > 40 secs - N.B. exclude lupus “anticoagulant” Fibrinogen <1.0g/l Any combination of abnormal coagulation results accompanied by relevant symptoms

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