RRB LA UT20 – Haematology Practice Test 1: Phlebotomy Techniques & Anticoagulant Mechanisms

About this Assessment

About This Practice Test:
This targeted 30-question bilingual (English and Hindi) online practice test evaluates core laboratory knowledge in Phlebotomy, Venipuncture Techniques, Specimen Collection Standards, and Anticoagulant Mechanisms. Designed according to the RRB Paramedical Category (Laboratory Assistant Grade II, CEN 05/2026) CBT standards and standard MLT curriculum, this test covers anticoagulant chemistry, tube color codes, standard order of draw, volumetric blood-to-anticoagulant ratios, and pre-analytical error prevention.

Syllabus Covered:
– Anticoagulant Mechanisms & Color Codes:
* EDTA (K2/K3) calcium chelation and commonly lavender/purple stopper designation
* Trisodium citrate in 1:9 ratio for coagulation assays (light blue top) and 1:4 citrate:blood ratio for traditional Westergren ESR
* Heparin antithrombin-III acceleration (green top) and reasons for Romanowsky smear distortion
* Sodium fluoride enolase inhibition paired with potassium oxalate (gray top) for glucose preservation
* Trace element-free royal blue tubes (plain and additive-containing variants) and Acid Citrate Dextrose (ACD) yellow tubes
– Standard Order of Draw Protocols (CLSI / ISO standards):
* Sequence: Sterile blood cultures -> Light blue (citrate) -> SST/Red serum -> Green (heparin) -> Lavender (EDTA) -> Gray (oxalate/fluoride)
* Carryover complications: False hyperkalemia and hypocalcemia from EDTA carryover
– Phlebotomy Techniques & Venous Anatomy:
* Antecubital fossa vein selection: Median cubital vs. cephalic vs. basilic
* Tourniquet application: generally not more than 1 minute to minimize hemoconcentration
* Common adult venipuncture needle: 21-gauge, approximately 1 to 1.5 inches; actual selection depends on patient and device
* Needle insertion angle commonly 15° to 30° (WHO guidance: 30° or less)
* Capillary skin puncture standards: infant heel-stick margins and age-appropriate depth (term newborn generally no more than 2.0 mm); wipe the first drop because it may contain tissue fluid or debris
– Specimen Handling & Troubleshooting:
* Underfilling artifacts (excess anticoagulant relative to blood, RBC shrinkage and spurious PCV/MCV changes)
* Proper tube mixing by gentle inversions according to tube/additive instructions vs. vigorous shaking and hemolysis
* Management of vasovagal syncope during phlebotomy

Applicable Examinations:
– RRB Paramedical Recruitment (Laboratory Assistant Grade II, CEN 05/2026)
– Central Recruitment Boards: DSSSB Lab Technician, ESIC MLT, AIIMS Laboratory Technician, CGHS
– State Paramedical and State Medical Faculty Technical Examinations

Test Instructions & Features:
– 30 Questions | Fully Bilingual (English + Hindi)
– Timed CBT Mode: 30 Minutes (1 Minute per Question)
– CBT Marking Scheme: +1.00 for Correct Answer, -0.33 for Incorrect Answer (1/3rd Negative Marking)
– Explanations for Every MCQ
– Instant Scorecard, Time Tracking & Analytical Performance