Yes, HEMOGLOBINS is a Scrabble word!

Letter values in Scrabble US: H 4, E 1, M 3, O 1, G 2, L 1, O 1, B 3, I 1, N 1, S 1.

Is it a valid word?

HEMOGLOBINS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues

Not playable in Scrabble US: HAEMOGLOBIN, HB.