In case you missed us today... · Microscope Views (FREE)

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In case you missed us today...

Greetings Gang:

Here is the recording of the live study session today, for your review at your leisure! We went over a mix of questions in Lab Ops, UA/Body Fluids, Micro, and Heme.

👇🏽 Click here to view the recording

VIEW RECORDING - 84 mins (No highlights)

Key Takeaways

LAP Score is the CML/Leukemoid Differentiator: A high LAP score (e.g., 155) indicates a leukemoid reaction (mature cells), while a low score is characteristic of CML (immature cells).
JAK2 Mutation is Not Exclusive to ET: The JAK2 mutation, often linked to Essential Thrombocythemia (ET), also occurs in Primary Myelofibrosis (PMF). The key differentiator is PMF's "marked marrow fibrosis."
Campylobacter Jejuni's Key ID: Identify C. jejuni by its growth at 42°C, oxidase/catalase positivity, and positive hippurate test.
Study Strategy is Critical: Use process of elimination and common sense. For complex questions, memorize 2–4 key biochemicals per organism to rule out incorrect choices.

Topics

Lab Operations & Safety

Electrical Safety: Use a non-conductive material (wood/plastic) to separate a victim from a live electrical line.
Patient ID: Acceptable identifiers are full name, DOB, and medical record number. A room number is insufficient and unsafe.
Bloodborne Pathogens: Prevent exposure with engineering controls (splash guards) and PPE (gloves, masks). Asking patients about their HIV/hepatitis status is unethical and a HIPAA violation.
Surface Decontamination: Clean work surfaces with disinfectant after any blood/OPIM spill and at the start of each shift.
Chemical Handling: Read a chemical's label before moving or opening it.

Urinalysis & Body Fluids

Kidney Function: Kidneys maintain acid-base balance (via bicarbonate), produce hormones (renin, EPO), and regulate water/electrolytes. They do not reabsorb waste products.
Urine pH Indicators: The reagent strip uses methyl red (red/orange → yellow) and bromthymol blue (yellow → green/blue).
CSF Cell ID:

Macrophages: Large, vacuolated cells with a kidney-bean nucleus.
Malignant Cells: Clumped, dark-staining cells with a high N:C ratio and prominent nucleoli.

Sample Quality: Recognize common pre-analytical errors:

Lipemic: Cloudy/milky serum/plasma.
Hemolyzed: Red-tinged serum/plasma.
Icteric: Yellow/gold-tinged serum/plasma.

Hematology

Multiple Myeloma: Characterized by Rouleau formation (from excess IgG) and plasma cells.
Acute Leukemia: Presents with high fevers, bleeding gums, and petechiae. Lab findings include pancytopenia (low Hgb, Hct, Plt) and >20% blasts in peripheral blood and bone marrow. ALL is the most common childhood leukemia.
Myelodysplastic Syndromes (MDS): Dyserythropoiesis is indicated by oval macrocytes.

Note: Schistocytes suggest hemolysis (e.g., DIC, TTP), and basophilic stippling suggests lead poisoning.

Myeloproliferative Disorders (MPNs):

Primary Myelofibrosis (PMF): Hypercellular bone marrow, excess megakaryocyte proliferation, marked marrow fibrosis, and the JAK2 mutation.
Essential Thrombocythemia (ET): Also has megakaryocyte proliferation and the JAK2 mutation, but with less fibrosis and very high platelet counts.

Eosinophilia: A high eosinophil count can be caused by parasitic helminths, allergic reactions, and CML. It is notassociated with Mycosis Fungoides (a lymphoma).

Microbiology

Gram Stain ID:

Staphylococcus aureus: GPC in grape-like clusters. Catalase+, Coagulase+. The ORFX gene is specific to S. aureus.
Streptococcus pneumoniae: GPC in pairs/chains. Catalase-, Alpha-hemolytic, P-disc sensitive.
Corynebacterium spp.: GP rods in palisades ("Chinese letters").
Micrococcus spp.: GPC in tetrads, often lemon-yellow colonies.

Enterobacteriaceae ID (Providencia stuartii Example):

Indole+: Rules out Proteus mirabilis.
PAD+: Rules in Providencia and rules out Serratia marcescens.
Urea-: Rules out Morganella morganii and Proteus mirabilis.

Campylobacter Jejuni ID:

Growth at 42°C: Key differentiator for Campylobacter from stool.
Biochemicals: Oxidase+, Catalase+, Hippurate+.

Parasitology:

Chilomastix mesnili: Non-pathogenic flagellate with a "shepherd's crook" cyst.
Xenodiagnosis: An antiquated method for diagnosing Chagas disease (Trypanosoma cruzi). It involves feeding a non-infected kissing bug on a patient and later examining the bug's droppings for parasites.

Salmonella Serotyping: Uses O (somatic), H (flagellar), and Vi (capsular) antigens. The F1 antigen is for Yersinia pestis.

Next Steps

Marilyn: Create a consolidated PDF chart for hematology disease states (erythrocytes, leukocytes, platelets) and upload it to the Inner Circle community.
Community: Support Tina (exam today) and Nicole (exam Tuesday).
Consider joining the Inner Circle for the upcoming 7-day study session series.

👇🏽Click here to join the Inner Circle Community.

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