In trading on Thursday, shares of the SPDR S&P International Health Care Sector ETF ( IRY) entered into oversold territory, changing hands as low as $46.85 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of SPDR S&P International Health Care Sector, the RSI reading has hit 27.9 — by comparison, the RSI reading for the S&P 500 is currently 39.8. A bullish investor could look at IRY's 27.9 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), IRY's low point in its 52 week range is $40.00 per share, with $49.94 as the 52 week high point — that compares with a last trade of $46.85. SPDR S&P International Health Care Sector shares are currently trading down about 1.1% on the day.