05/05/2026
🍁 Common Pitfalls in CBC Interpretation
(Cold Agglutinin, Lipemia, and Hemolysis)🍁
🍁 1️⃣ Cold Agglutinin
✅ Cause
🔸Autoantibodies (usually IgM) bind to red blood cells at low temperatures (< 30 °C)
This leads to RBC agglutination
✅ Effects on CBC Parameters
🔺 Falsely increased MCV (RBC clusters counted as large cells)
🔻 Falsely decreased RBC count
🔺 Markedly increased MCHC (classic diagnostic clue)
🔸Hemoglobin is usually near the true value
🔸Abnormal RBC Histogram and Scattergram patterns
✅ Corrective Actions
🔸Warm the blood sample to 37 °C for 10–15 minutes
Mix gently and rerun the analysis
🔸Peripheral blood smear shows obvious RBC agglutination
🥛 2️⃣ Lipemia
✅ Cause
🔸Elevated plasma lipids (Postprandial state, Hypertri glyceridemia, IV lipid infusion)
Results in turbid or milky plasma
✅ Effects on CBC Parameters
🔺 Falsely increased Hemoglobin due to optical interference
🔺 Falsely increased MCH and MCHC
🔸RBC count and hematocrit are usually unaffected
🔸Plasma appears visibly cloudy
✅Corrective Actions
🔸Perform Plasma blanking or saline replacement
🔸Collect a fasting sample if possible
🔸Consider alternative Hemoglobin measurement methods if needed
🩸 3️⃣ Hemolysis
✅ Cause
🔸Improper blood collection or handling
🔸Vigorous shaking
🔸Small needle size
🔸Difficult venipuncture or prolonged tourniquet use
🔸Inappropriate transport or storage conditions
✅ Effects on CBC Parameters
🔻 Falsely decreased RBC count and Hematocrit
🔺 Abnormal Hemoglobin, MCH, and MCHC values
🔸Platelet count may be falsely altered
🔸Plasma appears pink to red
✅Corrective Actions
🔸Reject and recollect the specimen if Hemolysis is significant
🔸Interpret results in conjunction with blood smear findings
🔸Clearly indicate Hemolysis in the Laboratory report
👉 CBC results should never be interpreted based on numerical values alone.
Always correlate with:
🔸Histograms
🔸Scattergrams
🔸Flags
🔸Peripheral blood smear
👉Sample quality (Clots, Lipemia, Hemolysis)
👉 Understanding these pitfalls helps prevent reporting errors, improves Laboratory Accuracy, and supports timely and reliable clinical decision-making for optimal patient care.
