1. Which of the following parasites is endemic in Yemen and diagnosed by finding a lateral spine egg in stool?

2. Which stage of *Plasmodium falciparum* is most commonly seen in a peripheral blood film during acute malaria in Yemen?

3. What is the essential step before staining a thick blood film for malaria microscopic examination?

4. What is the primary anticoagulant used in the collection tube for Complete Blood Count (CBC)?

5. What is the correct ratio of Sodium Citrate anticoagulant to blood for Coagulation profiles (PT / PTT)?

6. Under microscopic examination, Iron Deficiency Anemia (IDA) characteristically appears as:

7. Which laboratory test is used to definitively differentiate between Sickle Cell Trait and Sickle Cell Disease?

8. Immature red blood cells that contain remnant RNA and indicate bone marrow compensatory activity are called:

9. What is the golden standard and confirmatory diagnostic test for Pulmonary Tuberculosis (TB) used in Yemen?

10. What is the specific decolorizer used in the Ziehl-Neelsen (Acid-Fast) staining protocol for M. tuberculosis?

11. Gram staining of Staphylococcus aureus under microscopic examination reveals:

12. Which culture media is considered both selective and differential for the isolation of Gram-negative enteric bacilli?

13. Pseudomonas aeruginosa produces a characteristic bluish-green pigment on nutrient media called:

14. The Widal test used for the presumptive diagnosis of Typhoid fever is based on which immunological principle?

15. Which serological screening test is widely utilized in clinics for the rapid detection of Brucellosis (Malta fever)?

16. Which of the following liver enzymes is most specific for detecting acute hepatocellular injury?

17. In cases of Obstructive Jaundice due to gallstones, which enzyme shows the most marked elevation?

18. Which biochemical marker is most reliable for evaluating renal function as it is least affected by dietary protein intake?

19. The Glycated Hemoglobin (HbA1c) test reflects the average blood glucose control over a period of:

20. Which lipoprotein is clinically referred to as the "good cholesterol" due to its protective role against atherogenesis?

21. Marked elevations of serum Amylase and Lipase are highly indicative of acute inflammation of which organ?

22. Which cardiac biomarker is considered the most sensitive and specific for the diagnosis of Myocardial Infarction (MI)?

23. Which blood group type is designated as the "Universal Donor" for packed red blood cells in emergency transfusions?

24. The Major Cross-match in blood bank pre-transfusion testing consists of mixing:

25. What is the standard and safe storage temperature range for Packed Red Blood Cells (Packed RBCs)?

26. Platelet concentrates must be stored in the blood bank under which of the following conditions?

27. The Direct Coombs Test (DAT) is primarily performed to detect:

28. To prevent Hemolytic Disease of the Newborn (HDN), an Rh-negative mother is given Anti-D prophylaxis if her newborn is:

29. Which immunoglobulin class is uniquely capable of crossing the placental barrier to provide passive immunity to the fetus?

30. Which pentameric immunoglobulin is the first to be secreted during a primary acute immune response to an infection?

31. Microscopic examination of urine sediment showing hexagonal crystals is a pathognomonic indicator of:

32. Crystals found in alkaline urine that exhibit a characteristic "coffin-lid" appearance are:

33. The presence of cellular or granular casts in urine sediment directly localizes the site of renal pathology to the:

34. Which hormone is qualitatively or quantitatively detected in urine/serum to confirm pregnancy?

35. Which parasite can be diagnosed by finding terminal-spined eggs in a patient's urine sample?

36. What is the infective stage of *Entamoeba histolytica* transmitted through contaminated food or water?

37. A flagellated intestinal protozoan that causes steatorrhea and shows a characteristic "old man appearance" face in its active stage is:

38. Which clinical specimen should NEVER be refrigerated before culture to prevent the death of fastidious pathogens like *Neisseria*?

39. What is the standard and most widely used fixative for preserving tissue biopsies in histopathology?

40. Which staining method represents the routine and primary stain combination for processing histological tissue sections?

41. Which laboratory parameter is monitored to adjust the therapeutic dosage of the oral anticoagulant Warfarin?

42. Which type of white blood cell shows a significant increase (leukocytosis) during parasitic helminth infections and allergies?

43. A severe congenital deficiency of coagulation Factor VIII results in a hereditary bleeding disorder known as:

44. To separate blood serum from the clotted cells, which basic laboratory equipment utilizes centrifugal force based on density?

45. The physical sterilization of culture media under 15 psi pressure at 121°C to destroy endspores is achieved using a/an:

46. In the event of a hazardous biological or infectious spill on a laboratory bench, what is the recommended disinfectant?

47. What is the immediate first-aid step required when a laboratory technician sustains an accidental needle-stick injury?

48. Which of the following laboratory investigations strictly requires the patient to fast for 12-14 hours before sample collection?

49. The phase of laboratory testing that includes patient identification, sample collection, transport, and handling is called:

50. For a valid Semen Analysis, what is the ideal sexual abstinence period recommended for the patient before producing the sample?