Medical Lab Technologist

07/03/2026

06/03/2026

01/03/2026

Why do labs use 70% alcohol instead of 90%+ to kill bacteria?
70% alcohol contains enough water to pe*****te the bacterial cell wall
* The water slows evaporation, giving alcohol time to work
* Proteins coagulate inside the cell how? bacteria die, but
Bacterial cells are full of proteins enzymes, structural proteins, and membrane proteins.
Proteins are made of amino acids folded into a precise
structure, held together by: hydrogen bonds
ionic interactions
hydrophobic interactions
When 70% alcohol enters the cell
* Alcohol disrupts these weak interactions
* Water facilitates this process by allowing alcohol tc pe*****te deeply
* The protein unfolds (denatures) and loses its functiona shape
The cell can no longer maintain life processes
With 90-95% alcohol, rapid evaporation and surface dehvdration cause proteins to coaqulate only on the outside, forming a protective layer that limits pe*******on.

27/02/2026

Here are high-yield mnemonics for MLT exams to remember Anemia classification easily 👇

🩸 1️⃣ Microcytic Anemia (MCV < 80 fL)

🔑 Mnemonic: “TAILS”

T – Thalassemia
A – Anemia of chronic disease
I – Iron deficiency
L – Lead poisoning
S – Sideroblastic anemia

📌 Most common in exams → Iron deficiency anemia

🩸 2️⃣ Macrocytic Anemia (MCV > 100 fL)

🔑 Mnemonic: “BIG FATS RBC”

B – B12 deficiency
I – Increased reticulocytes
G – GI malabsorption

F – Folate deficiency
A – Alcohol
T – Thyroid (Hypothyroidism)
S – Severe liver disease

🔑 For Megaloblastic specifically:

“B12 & Folic make DNA Sick if absent”

(B12 and Folate → DNA synthesis defect)

🩸 3️⃣ Normocytic Anemia (MCV 80–100 fL)

🔑 Mnemonic: “HAAPPI”

H – Hemolytic anemia
A – Acute blood loss
A – Aplastic anemia
P – Pregnancy
P – Post-hemorrhage
I – Infection (chronic disease early)

🩸 4️⃣ Hemolytic Anemia

🔴 Intrinsic Causes

🔑 Mnemonic: “HEM”

H – Hemoglobin defect
E – Enzyme defect
M – Membrane defect

Examples:

Hemoglobin → Thalassemia, Sickle cell

Enzyme → G6PD deficiency

Membrane → Hereditary spherocytosis

🔵 Extrinsic Causes

🔑 Mnemonic: “AIM”

A – Autoimmune
I – Infection (Malaria)
M – Mechanical (prosthetic valve)

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🩸 5️⃣ Causes of Decreased Production

🔑 Mnemonic: “BIFA”

B – B12 deficiency
I – Iron deficiency
F – Folate deficiency
A – Aplastic anemia

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🎯 SUPER QUICK REVISION TABLE

Type Key Mnemonic

Microcytic TAILS
Macrocytic BIG FATS RBC
Normocytic HAAPPI
Hemolytic Intrinsic HEM
Hemolytic Extrinsic AIM

22/02/2026

Klebsiella is an important Gram-negative, encapsulatec bacterium commonly associated with hospital-acauired infections, including pneumonia, UTIs, and septicemia Understanding its biochemical profile and antibiotic resistance patterns is crucial in clinical microbiology Building strong diagnostic fundamentals every day

22/02/2026

This diagram shows the Primary and Secondary Immune Responses after exposure to the same antigen.

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🟢 1️⃣ Primary Immune Response (First Exposure)

🔸 When the body encounters an antigen for the first time:

⏳ Lag Phase

No immediate antibody production.

Immune system recognizes antigen.

B-cells get activated and differentiate.

🧪 IgM Production

First antibody produced is IgM.

It rises slowly.

Level (titer) is low to moderate.

Response is shorter and weaker.

👉 This phase builds immunological memory.

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🔵 2️⃣ Secondary Immune Response (Second Exposure)

When the same antigen enters again:

⚡ Very Short / No Lag Phase

Memory B-cells recognize antigen immediately.

Faster activation.

🧬 IgG Production

IgG rises rapidly.

Level (titer) is much higher.

Response lasts longer.

Stronger and more effective.

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📊 Key Differences

Feature Primary Response Secondary Response

Lag time Long Very short
First antibody IgM IgG
Antibody level Low Very high
Duration Short Long
Memory cells Formed Already present

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🔬 Why This Is Important?

This principle explains:

💉 How vaccines work

🧠 Immunological memory

Faster recovery during reinfection

21/02/2026

20/02/2026

This diagram shows X-linked recessive inheritance using Hemophilia A as an example.

Hemophilia A is caused by a defect in the gene for clotting factor VIII, which is located on the X chromosome.

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Parents in the Diagram

👨 Father: Healthy

Genotype: XY

His X chromosome is normal.

Since males have only one X chromosome, if it were abnormal, he would show the disease.

👩 Mother: Healthy Carrier

Genotype: XX

One normal X chromosome

One abnormal X chromosome (defective factor VIII gene)

She is heterozygous (carrier) and usually has no symptoms.

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How Children Inherit It

The mother can pass either:

A normal X

Or an abnormal X

The father can pass:

X (to daughters)

Y (to sons)

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Possible Children

👧 Child A – Female (XX)

Gets normal X from father

Gets abnormal X from mother

Result: Carrier (like mother), healthy

👧 Child B – Female (XX)

Gets normal X from father

Gets normal X from mother

Result: Completely healthy

👉 All daughters receive father's normal X, so none will have hemophilia in this case.
But 50% of daughters may be carriers.

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👦 Child C – Male (XY)

Gets Y from father

Gets abnormal X from mother

Result: Hemophilia

Since males have only one X chromosome, if it is defective → they develop the disease.

👦 Child D – Male (XY)

Gets Y from father

Gets normal X from mother

Result: Healthy

👉 50% of sons may have hemophilia.

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Key Points About X-Linked Recessive Disorders

1. More common in males

2. Females are usually carriers

3. A carrier mother has:

50% chance of affected sons

50% chance of carrier daughters

4. An affected father cannot pass the disease to his sons (because sons get Y from father)

17/01/2026

The copper sulphate used to determine the donor acceptability has a specific gravity of 1.054 which is equal to the weight of a red cells with Hb of 12.5 gm/dL.