| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| how long is ppd valid | 0.06 | 0.9 | 1851 | 9 |
| how long is pdp valid | 1.17 | 0.7 | 6732 | 19 |
| how long is a ppd test valid for | 1.61 | 1 | 7277 | 10 |
| how long are ppd tests valid for | 1.55 | 0.7 | 8747 | 12 |
| how long are ppd valid for | 1.58 | 0.1 | 7245 | 15 |
| how long is ppd test good for | 0.27 | 0.1 | 4068 | 17 |
| how long are ppd results good for | 0.12 | 1 | 3610 | 87 |
| how long is ppd good after opening | 1.41 | 0.5 | 2449 | 35 |
| how long is ppd read good for | 0.41 | 0.7 | 1339 | 55 |
| how long does ppd and ppa last | 0.45 | 0.1 | 7825 | 9 |
| how long does ppd test last | 1.76 | 1 | 4408 | 90 |
| how long does pppd last | 1.17 | 0.4 | 6373 | 44 |
| how long can ppd be left unrefrigerated | 1.84 | 0.5 | 610 | 69 |
| ppd expires after opening | 1.35 | 0.8 | 2941 | 23 |
| when does ppd vial expire | 0.75 | 0.1 | 4667 | 52 |
| expiration after opening ppd | 0.83 | 0.8 | 2590 | 8 |
| how soon can a ppd be repeated | 0.02 | 0.7 | 9715 | 27 |
