We present baseline values for 12 hematologic and 17 serum chemistry parameters collected from 22 captive lynx (Felis lynx canadensis) in December 1992, at Ronan, Montana (USA). There were no significant differences in hematologic parameters between yearlings and adults or between sexes. Lynx originally captured in the wild had significantly higher mean (±SE) counts of neutrophils (7.7 ± 0.37 × 10³ versus 7.2 ± 0.35 × 10³) and lower counts of lymphocytes (1.1 ± 0.05 × 10³ versus 1.6 ± 0.08 × 10³) compared to lynx born and raised in captivity. Yearling lynx had significantly higher values for alkaline phosphatase than adults (51.0 ± 6.0 IU/1 versus 17.5 ± 0.8 IU/1.