Bloomberg equity option volatility data

Using the Bloomberg open API, I am trying to program a C++ script that is able to download option volatility data from Bloomberg. I currently do not have access to Bloomberg, but in the coming week I will be able to access a Bloomberg terminal to try out my script.

In which field are the individual option volatilities saved? I know that the last price field would be PX_LAST or LAST_PRICE, but have no idea in which field / format the option volatility would be accessible.

• The easiest way to find a field is to go to a ticker you are interested in on a terminal, say SPY US 02/20/15 P200 Equity <Go> and then type FLDS VOLATILITY: you will see a page with a list of fields related to volatility. Jan 29 '15 at 11:38
• Well as I said, I currently do not have access to a Bloomberg terminal. Jan 29 '15 at 11:54

For real time you could use IVOL_MID_RT (or ASK or BID) and for historical data IVOL_MID (or ASK or BID).