Direct health care costs for a CD4+ count higher than 500 amounted to 1,320 at Addenbrooke's NHS Trust and to 1,701 at Chelsea and Westminster Hospital. Direct health care costs for a CD4+ count higher than 200 and below 500 amounted to 1,629 at Addenbrooke's and to 1,774 at Chelsea and Westminster Hospital. Direct health care costs for a CD4+ count below 200 amounted to 7,588 at Addenbrooke's and to 6,984 at Chelsea and Westminster Hospital.