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From 7-G (largest) to 33-G (smallest) is used in common medical; 21-gauge needles for drawing blood for testing purposes; and 16- or 17-gauge needles for blood donation.
Posted by Tradeindia user (21-06-2021)
Hypo means ‘under’ and derma means ‘skin’ – that explains a hypodermic needle delivers a liquid drug into the body by entering the skin.