RRB Lab Technician cheat sheet
RRB Lab Technician · Keep the key ideas within reach.
Medical Laboratory Science
Normal adult haemoglobin: men about 13–17 g/dL, women about 12–15 g/dL; haematocrit ≈ 3 × haemoglobin.
Anaemia is classified by MCV: microcytic below 80 fL, normocytic 80–100 fL, macrocytic above 100 fL.
ESR by Westergren: men 0–15 mm/hr, women 0–20 mm/hr; it rises in inflammation and pregnancy.
Fasting plasma glucose reference is about 70–100 mg/dL; diabetes is diagnosed at ≥126 mg/dL fasting or ≥200 mg/dL with symptoms.
Liver enzymes ALT and AST are raised in hepatocellular injury; ALP and GGT rise in cholestasis.
Gram-positive bacteria stain purple (thick peptidoglycan); Gram-negative stain pink; Ziehl-Neelsen stain detects acid-fast bacilli such as Mycobacterium tuberculosis.
Culture media: MacConkey is selective for Gram-negatives and differential for lactose; blood agar is enriched and shows haemolysis.
Cardiac troponin I and T are the preferred markers of myocardial injury; CK-MB is less specific.
Renal function: normal serum creatinine roughly 0.6–1.2 mg/dL; BUN:creatinine ratio rises in pre-renal azotaemia.