Discussion
What kind of sample used for estimation of platelets count?
Answer: B
The sample for a platelet count is EDTA or double oxalated blood.
Platelets clump and stick to surfaces quickly, so the blood must be anticoagulated in a way that keeps them separate. EDTA chelates calcium and preserves platelet numbers and shape well, which is why it is the standard tube for blood counts; double oxalate is the older alternative.
An isotonic solution is a diluent, not a blood sample. A capillary sample may clot and give falsely low counts unless it is handled quickly. 'Anticoagulant added blood' is too vague: heparin, for example, causes platelet clumping, so the specific anticoagulant matters.
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