Medical Cert for OFWs - Do I need DOH, DFA & Embassy authentication?

Hi All!

I hope there are some Filipinos here who can give me the best advice of acquiring my Medical Cert requirement for Work Permit in Vietnam.

I am under a manpower agency here but it seems they too are still new to the process and couldn't  guide me properly so i opted to post this here. (It's a long story but we are initially informed to be direct hires but then because of changes in POEA rules, we now have to go through a manning agency)

As of now, I am just waiting for my docs to be processed in Vn (Foreign Affairs Dept and Stamp in Ph Embassy) to submit to POEA so that I can get my OEC. It was unfortunate though that it's taking so much time than what is expected.
Actually, the initial target was for us to move to Vn on 2nd week of Jan 2018 but to this date, still waiting.

My employer is also kind of annoyed already to the agency because just this day, we were given a late info by the agency that we need to authenticate my Medical Certificate first to DOH, then to DFA (Red Ribbon) and finally to Vn Embassy. btw, my medical cert from a POEA accredited clinic was issued about 2 or 3 weeks ago. All other requirements are all ready except this one.

Btw, from the list that the agency emailed this morning, it says that that Medical Certificates as part of Work Permit reqts should be issued from a selected Vn hospitals OR a Ph Hospital but need to undergo the authentication as mentioned earlier.

My question now is this, Is it possible to just take another medical exam in Vietnam when I get there so that I don't need to undergo this authentication process which will mean not just possible delays but also additional expense on our side.
My employer wants us (3 were hired) to be in Vietnam the soonest because the delays are also affecting their project plans for this Fiscal Year.

Hope you could help me with this.
TIA.