Mosbys Manual of Diagnostic and Laboratory Tests

Copyright 2018 by Elsevier Inc. All rights reserved.
Pagana: Mosbys Manual of Diagnostic and Laboratory Tests, 6th Edition
Iron-Deficiency Anemia
Case Study
 
A 72-year-old man developed chest pain whenever he was physically active. The pain ceased on
stopping his activity. He has no history of heart or lung disease. His physical examination was
normal except for notable pallor.
 
Studies Result
Electrocardiogram (EKG), p. 485 Ischemia noted in anterior leads
Chest x-ray study, p. 956 No active disease
Complete blood count (CBC), p.
156
 
Red blood cell (RBC) count, p.
396
2.1 million/mm (normal: 4.76.1 million/mm)
RBC indices, p. 399
Mean corpuscular volume
(MCV)
72 mm 3 (normal: 8095 mm
3 )
Mean corpuscular hemoglobin
(MCH)
22 pg (normal: 2731 pg)
Mean corpuscular hemoglobin
concentration (MCHC)
21 pg (normal: 2731 pg)
Red blood cell distribution width
(RDW)
9% (normal: 11%14.5%)
Hemoglobin (Hgb), p. 251 5.4 g/dL (normal: 1418 g/dL)
Hematocrit (Hct), p. 248 18% (normal: 42%52%)
White blood cell (WBC) count, p.
466
7800/mm 3 (normal: 4,50010,000/mcL)
WBC differential count, p. 466 Normal differential
Platelet count (thrombocyte
count), p. 362
Within normal limits (WNL) (normal: 150,000
400,000/mm 3 )
Half-life of RBC 2630 days (normal)
Liver/spleen ratio, p. 750 1:1 (normal)
Spleen/pericardium ratio <2:1 (normal)
Reticulocyte count, p. 407 3.0% (normal: 0.5%2.0%)
Haptoglobin, p. 245 122 mg/dL (normal: 100150 mg/dL)
Blood typing, p. 114 O
Iron level studies, p. 287
Iron 42 (normal: 65175 mcg/dL)
Total iron-binding capacity
(TIBC)
500 (normal: 250420 mcg/dL)
Transferrin (siderophilin) 200 mg/dL (normal: 215365 mg/dL)
Transferrin saturation 15% (normal: 20%50%)
 
 
Case Studies
Copyright 2018 by Elsevier Inc. All rights reserved.
2
Ferritin, p. 211 8 ng/mL (normal: 12300 ng/mL)
Vitamin B12, p. 460 140 pg/mL (normal: 100700 pg/mL)
Folic acid, p. 218 12 mg/mL (normal: 520 mg/mL or 1434 mmol/L)
 
Diagnostic Analysis
 
The patient was found to be significantly anemic. His angina was related to his anemia. His
normal RBC survival studies and normal haptoglobin eliminated the possibility of hemolysis..
His RBCs were small and hypochromic. His iron studies were compatible with iron deficiency.
His marrow was inadequate for the degree of anemia because his iron level was reduced.
 
On transfusion of O-positive blood, his angina disappeared. While receiving his third unit of
packed RBCs, he developed an elevated temperature to 38.5C, muscle aches, and back pain.
The transfusion was stopped, and the following studies were performed:
 
Studies Results
Hgb, p. 251 7.6 g/dL
Hct, p. 248 24%
Direct Coombs test, p. 157 Positive; agglutination (normal: negative)
Platelet count, p. 362 85,000/mm 3
Platelet antibody, p. 360 Positive (normal: negative)
Haptoglobin, p. 245 78 mg/dL
 
Diagnostic Analysis
 
The patient was experiencing a blood transfusion incompatibility reaction. His direct Coombs
test and haptoglobin studies indicated some hemolysis because of the reaction. His platelet count
dropped because of antiplatelet antibodies, probably the same ABO antibodies that caused the
RBC reaction.
 
He was given iron orally over the next 3 weeks, and his Hgb level improved. A rectal
examination indicated that his stool was positive for occult blood. Colonoscopy indicated a right-
side colon cancer, which was removed 4 weeks after his initial presentation. He tolerated the
surgery well.
 
Critical Thinking Questions
 
1. What was the cause of this patient’s iron-deficiency anemia?
2. Explain the relationship between anemia and angina.
3. Would your recommend B12 and Folic Acid to this patient? Explain your rationale for the answer
 
4. What other questions would you ask to this patient and what would be your rationale for them?