The licence behind the price: DHA, DoH and MOHAP tiers
Every legitimate home nurse in the UAE holds a personal professional licence from the regulator of the emirate where they practise: the Dubai Health Authority (DHA) in Dubai, the Department of Health (DoH) in Abu Dhabi, and the Ministry of Health and Prevention (MOHAP) across Sharjah, Ajman, Umm Al Quwain, Ras Al Khaimah and Fujairah. On top of that, the home healthcare company employing them holds its own facility licence. Both layers cost money to obtain and maintain, and both show up in your quote — which is exactly why a properly licensed registered nurse costs more per hour than an informal arrangement ever will.
Verification takes minutes and is free. In Dubai you can check any professional's licence number on the DHA's Sheryan portal; Abu Dhabi and MOHAP offer equivalent lookups. Ask for the licence number before you pay anything. A provider that hesitates to share it has answered your question.