Medical Lab Technology GB

Classifications of Depressive Disorders

Daily Laboratory Examinations

Preeclampsia vs Eclampsia 🤰⚠️
High-yield comparison for exams and clinical understanding.

🔹 Preeclampsia: New-onset hypertension after 20 weeks with proteinuria and/or end-organ dysfunction.
🔹 Eclampsia: Preeclampsia complicated by generalized tonic-clonic seizures — a true obstetric emergency.

📌 Key exam points:
* BP ≥140/90 mmHg (on two occasions)
* Magnesium sulfate = drug of choice for seizure prevention & treatment
* Definitive treatment for both = DELIVERY

Early detection and timely management of preeclampsia can prevent progression to eclampsia.

⚠️Disclaimer- For educational purposes only. Not medical advice. Consult a qualified healthcare professional.

What is Coagulation?
Coagulation is the physiological process by which blood changes from a liquid to a gel, forming a fibrin clot to stop bleeding after vessel injury.
It is a part of hemostasis, which has three stages:
I.Vasoconstriction
II.Platelet plug formation (Primary hemostasis)
III.Coagulation cascade (Secondary hemostasis)
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2️⃣ Coagulation Cascade (Classical Pathway)
There are three pathways:

🔹 A. Intrinsic Pathway
Triggered by blood contact with damaged endothelium
Factors involved:
XII → XI → IX → VIII
Note :
Lab test: aPTT (Activated Partial Thromboplastin Time)

🔹 B. Extrinsic Pathway
Triggered by tissue injury
Involves:
Tissue factor (Factor III)
Factor VII
Note:

Lab test: PT (Prothrombin Time)

🔹 C. Common Pathway
Both pathways meet here:
X → V → II (Prothrombin) → I (Fibrinogen)
Thrombin converts fibrinogen → fibrin
Factor XIII stabilizes fibrin
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3️⃣ Modern Cell-Based Model (Important for Exams)
Now coagulation is explained in 3 phases:

I.Initiation – TF + VIIa
II. Amplification – Platelet activation
III. Propagation – Massive thrombin burst

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Important Lab Tests (Very Important )
🧪 PT
Extrinsic + Common pathway
Monitoring: Warfarin
INR derived from PT
🧪 aPTT
Intrinsic + Common pathway
Monitoring: Heparin
🧪 Thrombin Time (TT)
Fibrinogen → Fibrin conversion
🧪 D-dimer
Fibrinolysis marker
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Common Disorders
🔴 Hemophilia A
Factor VIII deficiency
🔴 Hemophilia B
Factor IX deficiency
🔴 Von Willebrand Disease
Defective vWF → affects VIII
🔴 DIC (Disseminated Intravascular Coagulation)
Consumption of clotting factors
↑ PT, ↑ aPTT, ↓ platelets, ↑ D-dimer
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Sample Collection Errors (Lab Perspective)
⚠ Hemolyzed sample
⚠ Underfilled citrate tube (wrong 9:1 ratio)
⚠ Clotted sample
⚠ Delay in testing
All can falsely alter PT/aPTT.
_____________________________________________________Anticoagulants Used in Lab
1.Sodium citrate (coagulation tests)
2. EDTA (CBC)
3. Heparin (biochemistry)
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Note :
⚠️Disclaimer- For educational purposes only. Not medical advice. Consult a qualified healthcare professional.

🔥 Why potassium becomes high in hemolyzed sample?
RBCs contain very high potassium
Inside RBC (intracellular K⁺): ~120–150 mmol/L
Plasma/serum K⁺: ~3.5–5.0 mmol/L
So when RBCs break (hemolysis), potassium leaks out → false high K⁺
This is called:
✅ Pseudohyperkalemia (spurious hyperkalemia)
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✅ NEXT ACTION (Correct lab procedure)
1) Do NOT report potassium
Because it is analytically invalid.
2) Reject the sample
Mark: “Hemolyzed sample”
Add comment: “K⁺ falsely increased due to hemolysis”
3) Request a repeat sample (recollection)
Preferably:
Fresh venipuncture
Proper technique
Avoid hemolysis

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🚨 What should you do if it is an emergency (STAT / ICU)?
Best action:
✅ Call the ward/doctor immediately and say:
“Sample is hemolyzed. Potassium result is unreliable. Please send repeat sample urgently.”
Recommended repeat:
Heparinized whole blood for ABG analyzer (gives rapid K⁺) OR
Fresh serum/plasma sample

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📌 When should potassium be repeated?
Always repeat if:
Hemolysis index is high
Visible hemolysis (pink/red serum)
K⁺ is unexpectedly high
Patient has no symptoms but K⁺ is very high

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⚠️ Important Clinical Safety Point
If you report hemolyzed potassium as true high: ❌ Patient may receive unnecessary treatment like:
Insulin + glucose
Calcium gluconate
Salbutamol
Dialysis
Which can cause: 🚫 Dangerous hypokalemia and arrhythmias.

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🧪 Common causes of hemolysis (for your lab exam)
During collection:
Using too small needle (e.g., 25G)
Pulling syringe too fast
Forcefully pushing blood into tube
Excessive tourniquet time
Fist clenching
Shaking tube vigorously
After collection:
Rough transport
Delayed separation
Centrifugation problems

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How much does hemolysis affect potassium?
It depends on degree, but roughly:

Mild hemolysis can increase K⁺ by 0.3–1.0 mmol/L
Severe hemolysis can increase K⁺ by 2–5 mmol/L or more
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⚠️Disclaimer- For educational purposes only. Not medical advice. Consult a qualified healthcare professional.

Physiology of the menstrual cycle 🌸🩸
A complete, exam-oriented overview covering menarche, menopause, cycle duration, ovarian & uterine events, hormonal regulation, and the three key phases—menstrual, proliferative, and secretory.
Understanding estrogen, progesterone, FSH, and LH interplay is essential for gynecology, nursing, and medical entrance exams.
Remember: ovulation usually occurs around day 14 in a 28-day cycle, but normal variation exists.

⚠️Disclaimer- For educational purposes only. Not medical advice. Consult a qualified healthcare professional.

HbA1c Test

1. Objective
The objective of the HbA1c test was to measure the average blood glucose concentration over the previous two to three months by detecting the proportion of glycated hemoglobin in a blood sample. This evaluation provided long-term glycemic control status for diabetic patients.
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2. Principle
The test was based on the principle that glucose in the bloodstream bound irreversibly to hemoglobin within red blood cells, forming glycosylated hemoglobin (HbA1c). Since red blood cells had an average lifespan of 120 days, the amount of HbA1c reflected the average blood glucose concentration over that period. Various analytical methods such as ion-exchange chromatography, immunoassay, or high-performance liquid chromatography (HPLC) were used to separate and quantify HbA1c.
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3. Materials
The materials that were used included:
• Sterile syringes and vacutainer tubes (with EDTA anticoagulant) for blood collection
• Microscopic slides and cover slips
• Stains (as required for microscopic preparation, e.g., Wright’s stain for morphology verification)
• Pipettes and micropipette tips
• Centrifuge machine
• HbA1c testing kit (HPLC or immunoassay reagents)
• Microscope for examining red blood cells and confirming sample integrity
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4. Procedure (Microscopic)
1. A venous blood sample was collected in an EDTA tube.
2. The sample was centrifuged, and red blood cells were separated for analysis.
3. A smear was prepared on a microscopic slide to assess red cell morphology, ensuring no hemolysis or abnormality interfered with the test.
4. The prepared slide was air-dried and stained, then examined under a microscope to confirm red cell integrity.
5. The HbA1c concentration was then determined using the chosen method (HPLC or immunoassay). The microscopic step ensured sample quality before analytical processing.
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5. Result
The results were expressed as a percentage of HbA1c relative to total hemoglobin.
• Normal range: 4% – 5.6%
• Prediabetes: 5.7% – 6.4%
• Diabetes: ≥ 6.5%
The test report provided both the HbA1c percentage and an estimated average glucose (eAG) level.
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6. Uses
The HbA1c test was used for:
• Diagnosis of diabetes mellitus
• Monitoring long-term glycemic control in diabetic patients
• Assessing the effectiveness of treatment regimens
• Predicting risks of diabetic complications (neuropathy, retinopathy, nephropathy)
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7. Consultation
After obtaining the results, patients were advised to consult a physician or endocrinologist. The healthcare provider interpreted the values, adjusted medication if necessary, and gave dietary, lifestyle, or insulin therapy recommendations. The consultation also included counseling on preventing long-term diabetic complications through strict glycemic control.

⚠️Disclaimer- For educational purposes only. Not medical advice. Consult a qualified healthcare professional.

RBC inclusions means abnormal materials seen inside red blood cells on a peripheral blood smear (PBS). They help in diagnosis of many anemias and infections.
✅ Common RBC Inclusions (with meaning)

1) Howell–Jolly bodies
What: Small round dark dot (DNA remnant)
Seen in:
Post-splenectomy
Hyposplenism
Megaloblastic anemia
Sickle cell disease

2) Basophilic stippling
What: Many fine/coarse blue dots (ribosomal RNA)
Seen in:
Lead poisoning
Thalassemia
Sideroblastic anemia
Alcoholism

3) Pappenheimer bodies (Siderotic granules)
What: Small iron granules (seen better with Prussian blue stain)
Seen in:
Sideroblastic anemia
Post-splenectomy
Hemolytic anemia

4) Heinz bodies
What: Denatured hemoglobin (not seen on normal stain)
Stain: Supravital stain (Crystal violet)
Seen in:
G6PD deficiency
Unstable hemoglobin
Oxidative drug exposure

5) Cabot rings
What: Ring or figure-8 thread-like structure
Seen in:
Severe anemia
Megaloblastic anemia
Lead poisoning

6) HbH inclusions
What: “Golf ball” appearance (supravital stain)
Seen in:
Alpha-thalassemia (HbH disease)

7) Parasites inside RBC
Example: Malaria (Plasmodium)
Seen in:
Malaria infection

⭐ Quick Exam Tip
Howell-Jolly = DNA remnant
Basophilic stippling = RNA
Pappenheimer = Iron
Heinz body = Denatured Hb (supravital stain)

⚠️Disclaimer- For educational purposes only. Not medical advice. Consult a qualified healthcare professional

Repolish knowledge!!🧠

⚠️Disclaimer- For educational purposes only. Not medical advice. Consult a qualified healthcare professional