hematologic system
HEMATOLOGIC SYSTEM INTENSE STUDY GUIDE
Question → Answer Style
STRUCTURES & FUNCTIONS
Bone Marrow / Hematopoiesis
Q: Hematopoiesis means?
A: Formation of blood cells.
Q: Where does hematopoiesis occur?
A: Red bone marrow.
Q: Function of red bone marrow?
A: Produces RBCs, WBCs, platelets.
Blood Components
RBCs (Erythrocytes)
Q: Function of RBCs?
A: Carry oxygen via hemoglobin.
Q: Main component carrying oxygen?
A: Hemoglobin (Hgb).
Q: Low RBCs can cause?
A: Anemia.
WBCs (Leukocytes)
Q: Function of WBCs?
A: Fight infection.
Q: Low WBC = ?
A: Leukopenia.
Q: High WBC = ?
A: Leukocytosis.
Platelets (Thrombocytes)
Q: Function?
A: Clot formation.
Q: Low platelets = ?
A: Thrombocytopenia.
Risk? Bleeding.
Spleen
Q: Function of spleen?
A: Filters blood and removes old RBCs.
Lymph System
Q: Function?
A: Fluid drainage + immune defense.
Q: Lymph nodes do what?
A: Filter lymph.
ASSESSMENT
Subjective Data
Q: Symptoms of hematologic problems?**
Fatigue
Weakness
Dyspnea
Dizziness
Palpitations
Bleeding history
Objective Data
Inspection
Look for:
Pallor
Petechiae
Ecchymosis
Jaundice
Bleeding
Pallor
Q: Pallor suggests?
A: Anemia.
Check:
Conjunctiva
Nail beds
Mucosa
Petechiae
Q: Petechiae?
A: Tiny red/purple spots.
Cause?
Low platelets.
Ecchymosis
Q: Ecchymosis?
A: Bruising.
ANEMIA
Definition: Decreased oxygen carrying capacity.
General Manifestations
Fatigue
Weakness
Pallor
SOB
Tachycardia
Dizziness
Headache
Cold intolerance
IRON DEFICIENCY ANEMIA ⭐⭐⭐
Cause:
Low iron
Blood loss
Poor intake
Pregnancy
Manifestations
Fatigue
Pallor
SOB
Glossitis
Brittle nails
Pica
Labs
LOW serum iron
LOW ferritin
LOW Hgb
Iron Teaching (VERY HIGH YIELD)
Take with:
Vitamin C.
Avoid taking with:
Milk
Antacids
Calcium
SE:
Constipation
Dark stools
GI upset
Liquid iron teaching:
Use straw.
Brush teeth.
FOLIC ACID DEFICIENCY
Cause:
Poor intake
Alcohol
Pregnancy
Malabsorption
Manifestations
Same anemia symptoms.
Labs:
LOW folate.
Teaching:
Increase leafy greens.
Give folic acid.
APLASTIC ANEMIA ⭐⭐⭐
Definition: Bone marrow failure.
Findings
Pancytopenia:
↓ RBC
↓ WBC
↓ Platelets
Manifestations
Fatigue
Infection risk
Bleeding risk
Petechiae
Nursing Priorities
Infection prevention
Bleeding precautions
Monitor CBC
ANEMIA FROM BLOOD LOSS
Acute blood loss
Examples:
Trauma
Surgery
GI bleed
Manifestations:
Hypotension
Tachycardia
Shock
Chronic blood loss
Examples:
Heavy menses
GI bleeding
Manifestations:
Gradual fatigue
Weakness
Iron deficiency
DIAGNOSTIC STUDIES
CBC ⭐⭐⭐
Hemoglobin (Hgb)
Carries oxygen.
LOW = anemia.
Hematocrit (Hct)
% RBC volume.
LOW = anemia.
WBC
High → infection.
Low → infection risk.
Platelets
Normal clotting.
LOW → bleeding.
Blood Typing / Rh
Q: Rh positive means?
A: Has Rh antigen.
ESR
(Erythrocyte Sedimentation Rate)
Measures:
Inflammation.
Bilirubin
High bilirubin suggests?
RBC destruction.
Liver problems.
Serum Iron
Measures circulating iron.
LOW in iron deficiency.
Transferrin
Iron transport protein.
PT / INR / PTT ⭐⭐⭐
PT / INR
Monitors:
Warfarin.
PTT
Monitors:
Heparin.
Biopsy
Bone marrow biopsy evaluates?
Blood cell production.
MEDS
Vitamin B12
Use?
B12 deficiency / pernicious anemia.
Manifestations deficiency:
Fatigue
Glossitis
Neurologic symptoms
Tingling
Folate
Use?
Folate deficiency.
Teaching:
Increase leafy greens.
Iron
Take with Vitamin C.
Avoid calcium.
Dark stool expected.
ASPIRIN ⭐⭐⭐
Class?
Antiplatelet.
Action?
Prevents platelet aggregation.
SE:
Bleeding
GI irritation
Tinnitus toxicity
Avoid:
Other anticoagulants unless ordered.
CLOPIDOGREL (Plavix) ⭐⭐⭐
Action?
Prevents platelet aggregation.
Watch:
Bleeding
Bruising
GI bleed
Hold before surgery sometimes.
EPOETIN ALFA ⭐⭐⭐
(You just studied this recently)
Class?
Erythropoiesis-stimulating agent.
Action?
Stimulates RBC production.
Use?
CKD anemia
Chemo anemia
Monitor:
Hgb
BP
Risk:
HTN
Thromboembolism
MI
Stroke
PRIORITY BOX
Pallor = anemia
Petechiae = platelets low
Iron + Vitamin C
NO milk with iron
Dark stools expected with iron
PT/INR = warfarin
PTT = heparin
Aplastic anemia = pancytopenia
Epoetin alfa = stimulates RBCs
Aspirin / clopidogrel = bleeding risk
STRUCTURES & FUNCTIONS
Bone Marrow / Hematopoiesis
Q: Hematopoiesis means?
A: Formation of blood cells is a complex process that includes the differentiation of pluripotent stem cells into various types of blood cells, including red blood cells (RBCs), white blood cells (WBCs), and platelets. This process is vital for maintaining normal blood cell levels and is influenced by various growth factors and cytokines.
Q: Where does hematopoiesis occur?
A: Hematopoiesis primarily occurs in the red bone marrow, which is found in flat bones (such as the sternum and pelvis) and the ends of long bones (such as the femur). In fetal development, hematopoiesis also occurs in the liver and spleen before transitioning to the bone marrow at birth.
Q: Function of red bone marrow?
A: Produces RBCs, WBCs, and platelets, which are essential components of the blood necessary for oxygen transport, immune response, and blood clotting, respectively. The microenvironment within the bone marrow supports the development of hematopoietic cells, facilitated by a stromal network that provides structural support and biochemical signals.
Blood Components
RBCs (Erythrocytes)
Q: Function of RBCs?
A: Carry oxygen via hemoglobin, which enables them to transport oxygen from the lungs to tissues throughout the body. RBCs also assist in transporting carbon dioxide back to the lungs for exhalation, playing a crucial role in maintaining acid-base balance.
Q: Main component carrying oxygen?
A: Hemoglobin (Hgb), a protein that can bind to oxygen molecules. The structure of hemoglobin allows it to carry four oxygen molecules, significantly enhancing oxygen transport efficiency in the bloodstream.
Q: Low RBCs can cause?
A: Anemia, which may lead to symptoms such as fatigue, weakness, and pallor due to inadequate oxygen delivery to tissues. Anemia can result from various conditions, including nutritional deficiencies, chronic disease, or bone marrow disorders.
WBCs (Leukocytes)
Q: Function of WBCs?
A: Fight infection and play a critical role in the immune response. They are involved in recognizing and responding to pathogens, producing antibodies, and orchestrating the immune response to eliminate infection.
Q: Low WBC = ?
A: Leukopenia, which increases the risk of infections due to insufficient immune defense.
Q: High WBC = ?
A: Leukocytosis, which often indicates an active immune response, such as infection or inflammation, and can also be associated with certain types of cancer.
Platelets (Thrombocytes)
Q: Function?
A: Clot formation, which is essential for hemostasis. Platelets aggregate at the site of a vascular injury to form a plug and release factors that promote coagulation.
Q: Low platelets = ?
A: Thrombocytopenia, which heightens the risk of bleeding due to impaired clotting mechanisms.
Risk? Serious bleeding events may occur, especially if the platelet count is significantly reduced.
Spleen
Q: Function of spleen?
A: Filters blood and removes old or damaged RBCs, contributing to recycling iron and other components. Additionally, the spleen serves as a reservoir for blood and plays a role in the immune response by producing lymphocytes and filtering out pathogens from the bloodstream.
Lymph System
Q: Function?
A: Fluid drainage and immune defense. The lymphatic system collects excess interstitial fluid and returns it to the bloodstream while also transporting immune cells throughout the body to respond to infections.
Q: Lymph nodes do what?
A: Filter lymph, trapping pathogens and foreign particles. They are sites where immune responses can be activated, enabling the proliferation of lymphocytes in response to an infection.
ASSESSMENT
Subjective Data
Q: Symptoms of hematologic problems?
Fatigue
Weakness
Dyspnea (shortness of breath due to reduced oxygen-carrying capacity)
Dizziness
Palpitations
Bleeding history (including frequent nosebleeds, easy bruising, or prolonged bleeding after cuts)
Objective Data
Inspection
Look for:
Pallor (indicative of anemia)
Petechiae (small, pinpoint hemorrhages)
Ecchymosis (bruising)
Jaundice (yellowing of skin and eyes, suggesting liver dysfunction or hemolysis)
Signs of bleeding (e.g., blood in urine or stool)
Pallor
Q: Pallor suggests?
A: Anemia. The assessment of pallor should occur in areas with less pigmentation. Check:
Conjunctiva (the mucous membrane covering the eye)
Nail beds
Mucosa (oral cavity)
Petechiae
Q: Petechiae?
A: Tiny red/purple spots typically caused by a decrease in platelet count (thrombocytopenia), indicating potential bleeding disorders.
Ecchymosis
Q: Ecchymosis?
A: Bruising, which may indicate bleeding disorders or trauma.
ANEMIA
Definition: Decreased oxygen-carrying capacity of the blood, which can result from various etiologies, including nutritional deficiencies, chronic diseases, and intrinsic bone marrow pathology.
General Manifestations
Symptoms generally include:
Fatigue
Weakness
Pallor
Shortness of breath (SOB)
Tachycardia (increased heart rate)
Dizziness
Headache
Cold intolerance
IRON DEFICIENCY ANEMIA ⭐
Cause:
Low iron intake
Chronic blood loss (e.g., menstruation, gastrointestinal bleeds)
Poor absorption of iron (from conditions like celiac disease)
Increased requirement during pregnancy
Manifestations
Common symptoms include:
Fatigue
Pallor
Shortness of breath (SOB)
Glossitis (inflammation of the tongue)
Brittle nails
Pica (cravings for non-nutritive substances)
Labs
Expectation in testing:
LOW serum iron
LOW ferritin (indicating depleted iron stores)
LOW Hemoglobin (Hgb), confirming anemia
Iron Teaching (VERY HIGH YIELD)
Take with: Vitamin C (enhances iron absorption).
Avoid taking with:
Dairy products (milk)
Antacids (they inhibit absorption)
Calcium-containing foods
SE: Common side effects of iron supplements include:
Constipation
Dark stools (a typical side effect)
Gastrointestinal upset (nausea, cramping)
Liquid iron teaching:
Recommend using a straw to prevent staining teeth.
Encourage brushing teeth afterward.
FOLIC ACID DEFICIENCY
Cause:
Low dietary intake
Alcohol abuse (which affects absorption)
Pregnancy and lactation (increased needs)
Malabsorption syndromes such as Crohn’s disease
Manifestations
Manifestations are similar to anemia symptoms.
Labs:
LOW folate levels in blood tests.
Teaching:
Increase dietary intake of leafy green vegetables (sources of folate).
Provide folic acid supplements as needed.
APLASTIC ANEMIA ⭐
Definition: Bone marrow failure leading to decreased production of blood cells, including all three cell lines (RBCs, WBCs, and platelets).
Findings
Characteristic findings include:
Pancytopenia: reductions in RBC, WBC, and platelet counts across the board.
Manifestations
Include:
Fatigue and weakness due to anemia
Infection risk due to low WBC counts
Bleeding risk due to low platelets
Petechiae and other signs of bleeding
Nursing Priorities
Focus on:
Infection prevention through hygiene and monitoring
Bleeding precautions to avoid trauma
Regular monitoring of complete blood count (CBC) and other relevant labs
ANEMIA FROM BLOOD LOSS
Acute blood loss
Examples include:
Trauma (accidents, injuries)
Surgery complications
Gastrointestinal hemorrhage (GI bleed)
Manifestations:
Hypotension (low blood pressure)
Tachycardia (elevated heart rate)
Symptoms of shock (rapid heartbeat, confusion, cold clammy skin)
Chronic blood loss
Examples include:
Heavy menstrual bleeding (menorrhagia)
Chronic GI bleeding (e.g., ulcers)
Manifestations:
Gradual onset of fatigue
Ongoing weakness
Development of iron deficiency due to sustained blood loss
DIAGNOSTIC STUDIES
CBC ⭐
Hemoglobin (Hgb)
Q: Carries oxygen.
A: LOW levels indicate anemia.
Hematocrit (Hct)
Q: % RBC volume.
A: LOW level suggests anemia or volume depletion.
WBC
High levels indicate potential infection or inflammatory process.
Low levels indicate heightened infection risk.
Platelets
Play a crucial role in coagulation.
LOW levels can lead to significant bleeding risk.
Blood Typing / Rh
Q: Rh positive means?
A: Has Rh antigen, indicating compatibility for blood transfusions in cases of Rh factor consideration.
ESR
(Erythrocyte Sedimentation Rate)
Measures:
Inflammation levels in the body. An increased rate can indicate a variety of conditions, including infections and autoimmune diseases.
Bilirubin
High bilirubin suggests?
RBC destruction (hemolysis) or liver dysfunction.
Serum Iron
Measures circulating iron levels in the blood, with LOW levels indicating iron deficiency.
Transferrin
Iron transport protein that can indicate iron deficiency based on levels in the blood.
PT / INR / PTT ⭐
PT / INR
Monitors anticoagulant therapy with Warfarin, ensuring therapeutic levels are maintained for effective blood thinning.
PTT
Monitors anticoagulant therapy with Heparin to prevent clotting.
Biopsy
Bone marrow biopsy evaluates:
Blood cell production and helps diagnose conditions such as leukemia, lymphoma, and aplastic anemia, providing essential insight into bone marrow health.
MEDS
Vitamin B12
Use?
Treats B12 deficiency and pernicious anemia, essential for DNA synthesis and neuronal health.
Manifestations deficiency:
Fatigue
Glossitis
Neurologic symptoms (e.g., neuropathy, tingling, memory issues)
Folate
Use?
Treats folate deficiency, essential for cell division and DNA synthesis.
Teaching:
Increase leafy green vegetable intake.
Iron
Take with Vitamin C to enhance absorption. Avoid calcium during administration. Dark stools can be expected due to iron supplements.
ASPIRIN ⭐
Class? Antiplatelet.
Action? Prevents platelet aggregation to reduce thrombus formation, indicated in various cardiovascular diseases.
SE:
BLEEDING
GI irritation (e.g., ulcers)
Tinnitus (a sign of toxicity at high levels)
Avoid:
Other anticoagulant use unless supervised by healthcare provider to mitigate bleeding risk.
CLOPIDOGREL (Plavix) ⭐
Action?
Prevents platelet aggregation, indicated for preventing stroke and heart attacks.
Watch:
Monitor for bleeding, bruising, and gastrointestinal bleeding, especially in geriatric patients.
Hold before surgery:
Sometimes required to minimize bleeding risks during procedures.
EPOETIN ALFA ⭐
Class? Erythropoiesis-stimulating agent.
Action? Stimulates RBC production in the bone marrow, counteracting anemia in chronic kidney disease and those undergoing chemotherapy.
Monitor:
Hgb levels and blood pressure.
Risk:
Essential to consider potential risks for hypertension, thromboembolism, and cardiovascular events (MI, stroke).
PRIORITY BOX
Pallor = anemia
Petechiae = platelets low
Iron + Vitamin C for better absorption
NO milk with iron (hinhibitory effect)
Dark stools expected with iron supplementation
PT/INR = warfarin monitoring
PTT = heparin monitoring
Aplastic anemia = pancytopenia significance
Epoetin alfa = stimulates RBCs in specific anemic conditions
Aspirin / clopidogrel = associated bleeding risk and management strategies.