BSP tu maksudnya sangkut gula ke? Or dah ada kencing manis?

Sape boleh tolong explain info about BSP ya? Sebab tadi saya first time minum gula & nurse cakap 28hb ni kena buat BSP sebab sangkut gula… bacaan gula normal berapa ya masa puasa? Tak berapa paham. Dia kata tadi bacaan gula 5.3 macam tu..