Anti coagulant usend in blood sampling

Ethylenediaminetetraacetic acid (EDTA), heparin, and citrate are the most commonly used anticoagulants (39–41). Potassium EDTA (Table 1), an anticoagulant and chelating agent, interferes with calcium assays and clot generation (42), but it is preferred for hematology testing.

a sequence is a function whose domain is the set of natural numbers.

natural numbers are all the negative and positive integers