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The following is a list of healthcare sector stocks. All of the stocks mentioned below have a large number of open call option positions relative to put option positions, i.e. a low Put/Call ratio.

Some technical traders view the Put/Call ratio as a contrary indicator when it reaches extreme highs or lows. In other words, because the stocks mentioned below have a high number of open call option positions, contrarians would think most of the stocks mentioned below are set for a pullback. Do you agree?

Options data sourced from Schaeffer's, short float and performance data sourced from Finviz.

Interactive Chart: Press Play to compare changes in analyst ratings over the last two years for the top six stocks mentioned below. Analyst ratings sourced from Zacks Investment Research. Note: The numbers on top of items represent the forward P/E ratio, if available.

The list has been sorted by the Put/Call ratio.

1. Optimer Pharmaceuticals, Inc. (NASDAQ:OPTR): Biotechnology Industry. Market cap of $467.01M. Call open interest at 2,613 contracts vs. put open interest at 303 contracts (Put/Call ratio at 0.12). Short float at 6.23%, which implies a short ratio of 12.32 days. The stock has lost -9.67% over the last year.

2. Chemed Corp. (NYSE:CHE): Home Health Care Industry. Market cap of $1.44B. Call open interest at 2,259 contracts vs. put open interest at 314 contracts (Put/Call ratio at 0.14). Short float at 3.56%, which implies a short ratio of 6.71 days. The stock has gained 30.44% over the last year.

3. Insulet Corporation (NASDAQ:PODD): Medical Instruments & Supplies Industry. Market cap of $749.86M. Call open interest at 6,343 contracts vs. put open interest at 1,125 contracts (Put/Call ratio at 0.18). Short float at 12.08%, which implies a short ratio of 16.53 days. The stock has gained 19.71% over the last year.

4. Allos Therapeutics, Inc. (NASDAQ:ALTH): Drug Manufacturers Industry. Market cap of $429.83M. Call open interest at 11,798 contracts vs. put open interest at 2,472 contracts (Put/Call ratio at 0.21). Short float at 9.83%, which implies a short ratio of 7.92 days. The stock has lost -45.6% over the last year.

5. Abiomed Inc. (NASDAQ:ABMD): Medical Instruments & Supplies Industry. Market cap of $387.1M. Call open interest at 640 contracts vs. put open interest at 151 contracts (Put/Call ratio at 0.24). Short float at 5.19%, which implies a short ratio of 8.35 days. The stock has gained 27.08% over the last year.

6. MEDNAX, Inc. (NYSE:MD): Specialized Health Services Industry. Market cap of $3.3B. Call open interest at 2,593 contracts vs. put open interest at 619 contracts (Put/Call ratio at 0.24). Short float at 3.68%, which implies a short ratio of 6.8 days. The stock has gained 16.6% over the last year.

7. Cell Therapeutics, Inc. (NASDAQ:CTIC): Biotechnology Industry. Market cap of $309.62M. Call open interest at 56,360 contracts vs. put open interest at 14,713 contracts (Put/Call ratio at 0.26). Short float at 7.16%, which implies a short ratio of 14.52 days. The stock has lost -66.96% over the last year.

8. Impax Laboratories Inc. (NASDAQ:IPXL): Drug Manufacturers Industry. Market cap of $1.43B. Call open interest at 3,414 contracts vs. put open interest at 892 contracts (Put/Call ratio at 0.26). Short float at 2.97%, which implies a short ratio of 2.89 days. The stock has gained 58.8% over the last year.

9. Sequenom Inc. (NASDAQ:SQNM): Biotechnology Industry. Market cap of $570.19M. Call open interest at 73,421 contracts vs. put open interest at 23,893 contracts (Put/Call ratio at 0.33). Short float at 23.68%, which implies a short ratio of 9.52 days. The stock has gained 74.13% over the last year.

10. PDL BioPharma, Inc. (NASDAQ:PDLI): Biotechnology Industry. Market cap of $765.45M. Call open interest at 18,020 contracts vs. put open interest at 6,067 contracts (Put/Call ratio at 0.34). Short float at 8.24%, which implies a short ratio of 5.52 days. The stock has lost -5.03% over the last year.

11. Qiagen NV (NASDAQ:QGEN): Biotechnology Industry. Market cap of $4.49B. Call open interest at 765 contracts vs. put open interest at 258 contracts (Put/Call ratio at 0.34). Short float at 2.41%, which implies a short ratio of 4.21 days. The stock has lost -17.93% over the last year.

12. Greatbatch, Inc. (NYSE:GB): Medical Appliances & Equipment Industry. Market cap of $561.98M. Call open interest at 1,053 contracts vs. put open interest at 364 contracts (Put/Call ratio at 0.35). Short float at 9.66%, which implies a short ratio of 18.68 days. The stock has gained 15.61% over the last year.

13. Protalix BioTherapeutics, Inc. (NYSEMKT:PLX): Biotechnology Industry. Market cap of $816.97M. Call open interest at 6,023 contracts vs. put open interest at 2,101 contracts (Put/Call ratio at 0.35). Short float at 11.74%, which implies a short ratio of 16.98 days. The stock has gained 33.07% over the last year.

14. Life Technologies Corporation (NASDAQ:LIFE): Biotechnology Industry. Market cap of $10.32B. Call open interest at 18,316 contracts vs. put open interest at 6,826 contracts (Put/Call ratio at 0.37). Short float at 2.53%, which implies a short ratio of 2.48 days. The stock has gained 8.29% over the last year.

15. Clinical Data, Inc. (NASDAQ:CLDA): Biotechnology Industry. Market cap of $464.68M. Call open interest at 34,659 contracts vs. put open interest at 13,037 contracts (Put/Call ratio at 0.38). Short float at 16.77%, which implies a short ratio of 16.57 days. The stock has lost -14.07% over the last year.

16. Sunrise Senior Living Inc. (SRZ): Long-Term Care Facilities Industry. Market cap of $445.02M. Call open interest at 1,000 contracts vs. put open interest at 383 contracts (Put/Call ratio at 0.38). Short float at 5.79%, which implies a short ratio of 4.54 days. The stock has gained 138.97% over the last year.

17. DexCom, Inc. (NASDAQ:DXCM): Medical Instruments & Supplies Industry. Market cap of $903.85M. Call open interest at 2,460 contracts vs. put open interest at 959 contracts (Put/Call ratio at 0.39). Short float at 7.15%, which implies a short ratio of 8.33 days. The stock has gained 58.66% over the last year.

18. American Medical Systems Holdings Inc. (NASDAQ:AMMD): Medical Appliances & Equipment Industry. Market cap of $1.47B. Call open interest at 1,762 contracts vs. put open interest at 693 contracts (Put/Call ratio at 0.39). Short float at 8.95%, which implies a short ratio of 7.83 days. The stock has lost -3.71% over the last year.

19. Immucor Inc. (NASDAQ:BLUD): Diagnostic Substances Industry. Market cap of $1.46B. Call open interest at 4,122 contracts vs. put open interest at 1,667 contracts (Put/Call ratio at 0.4). Short float at 3.26%, which implies a short ratio of 3.41 days. The stock has gained 3.11% over the last year.

20. Health Net Inc. (NYSE:HNT): Health Care Plans Industry. Market cap of $2.75B. Call open interest at 10,491 contracts vs. put open interest at 4,552 contracts (Put/Call ratio at 0.43). Short float at 2.31%, which implies a short ratio of 2.12 days. The stock has gained 12.51% over the last year.

Source: Contrarian Ideas: 20 Healthcare Stocks With Low Put/Call Ratios