 Patients will start treatment within 21 days of the determination of inadequate mobilization. PTH treatment will be given in 4 cohorts: 40 mcg, 60 mcg, 80 mcg, and 10 mcg. PTH will be given on day 1 and continue until stem cell collections are complete or a maximum of 20 days. G-CSF 10 mcgkg will be given on days 10-14 and continue until stem cell collections are complete. Patients with inadequate CD34 cells on Day 14 will meet off study criteria and not continue with PTHG-CSF. 